CVE-2026-74586

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74586", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.918Z", "datePublished": "2026-08-22T15:31:39.094Z", "dateUpdated": "2026-10-16T19:05:58.687Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:12.552Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc->new_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc->new_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport's state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n Call Trace:\n sctp_outq_select_transport+0x549/0x8b0 [sctp]\n sctp_outq_flush+0x306/0x2c60 [sctp]\n sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n Allocated by task 197:\n sctp_transport_new+0x68/0x650 [sctp]\n sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x77/0xb70\n sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport->state at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is triggered when a remote SCTP peer sends an authenticated ASCONF chunk that is processed via sctp_rcv() through the state machine into sctp_sf_do_asconf() and sctp_process_asconf(); this is standard network packet handling, not a local syscall or ioctl path.\nAC:L - The remote peer fully controls a single ASCONF containing ADD_IP followed by wildcard DEL-IP to add then remove a transport while leaving asoc->new_transport dangling; combined with routine SCTP local address replacement (src_out_of_asoc_ok), the KASAN reproducer hit the UAF in 2/2 runs.\nPR:N - Exploitation requires only being an established SCTP association peer sending SCTP-AUTH-protected ASCONF traffic negotiated during the normal handshake (or addip_noauth); no Linux account, capability, or init-namespace privilege is needed on the victim host.\nUI:N - No victim user action such as opening a file or mounting a filesystem is required; the kernel automatically processes attacker-crafted ASCONF packets on an existing SCTP association during normal server operation.\nS:U - Impact is confined to kernel heap corruption on the vulnerable host (slab UAF on sctp_transport) and potential privilege escalation within that kernel; it does not cross VM, container, or IOMMU security boundaries.\nC:H - KASAN reports slab-use-after-free with a 4-byte read of freed sctp_transport->state in sctp_outq_select_transport(); UAF on heap transport objects enables grooming for arbitrary kernel memory disclosure per kernel CVSS guidance.\nI:H - The dangling sctp_transport pointer is embedded in a queued HEARTBEAT control chunk without a reference; UAF on this heap object can be leveraged via heap spraying for arbitrary kernel writes and control-flow hijacking, not merely a bounded corruption.\nA:H - Dereferencing the freed transport during sctp_outq_flush() causes a reproducible kernel UAF/oops; remote peers can repeatedly trigger this against SCTP endpoints handling ADD-IP traffic, yielding denial of service or crash."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/associola.c"], "versions": [{"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "c0f973bb5118dd1b146cda3fcc8af6f6057befec", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "3b539b317cd052236fed0350364ff1268996ba46", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "db9d8e3b670f841755bc2018f178472dc6064d27", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "31efa656cf6aface26e88f038c14f22ee6ca1500", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "291accf36febce751021888de5f15090f4875b56", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "ca33df36aa0143a1d04f57d2086020c12e7eddb7", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "163847552a571bd55094291f4ffcdc1de0f14a7b", "status": "affected", "versionType": "git"}, {"version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sctp/associola.c"], "versions": [{"version": "3.2", "status": "affected"}, {"version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec"}, {"url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"}, {"url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27"}, {"url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500"}, {"url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56"}, {"url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7"}, {"url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b"}, {"url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"}], "title": "sctp: clear new_transport when removing a peer", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74586", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:22.679570Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:58.687Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74586", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:22.679570Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:01:23.245Z"}}], "cna": {"title": "sctp: clear new_transport when removing a peer", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is triggered when a remote SCTP peer sends an authenticated ASCONF chunk that is processed via sctp_rcv() through the state machine into sctp_sf_do_asconf() and sctp_process_asconf(); this is standard network packet handling, not a local syscall or ioctl path.\nAC:L - The remote peer fully controls a single ASCONF containing ADD_IP followed by wildcard DEL-IP to add then remove a transport while leaving asoc->new_transport dangling; combined with routine SCTP local address replacement (src_out_of_asoc_ok), the KASAN reproducer hit the UAF in 2/2 runs.\nPR:N - Exploitation requires only being an established SCTP association peer sending SCTP-AUTH-protected ASCONF traffic negotiated during the normal handshake (or addip_noauth); no Linux account, capability, or init-namespace privilege is needed on the victim host.\nUI:N - No victim user action such as opening a file or mounting a filesystem is required; the kernel automatically processes attacker-crafted ASCONF packets on an existing SCTP association during normal server operation.\nS:U - Impact is confined to kernel heap corruption on the vulnerable host (slab UAF on sctp_transport) and potential privilege escalation within that kernel; it does not cross VM, container, or IOMMU security boundaries.\nC:H - KASAN reports slab-use-after-free with a 4-byte read of freed sctp_transport->state in sctp_outq_select_transport(); UAF on heap transport objects enables grooming for arbitrary kernel memory disclosure per kernel CVSS guidance.\nI:H - The dangling sctp_transport pointer is embedded in a queued HEARTBEAT control chunk without a reference; UAF on this heap object can be leveraged via heap spraying for arbitrary kernel writes and control-flow hijacking, not merely a bounded corruption.\nA:H - Dereferencing the freed transport during sctp_outq_flush() causes a reproducible kernel UAF/oops; remote peers can repeatedly trigger this against SCTP endpoints handling ADD-IP traffic, yielding denial of service or crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "c0f973bb5118dd1b146cda3fcc8af6f6057befec", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "3b539b317cd052236fed0350364ff1268996ba46", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "db9d8e3b670f841755bc2018f178472dc6064d27", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "31efa656cf6aface26e88f038c14f22ee6ca1500", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "291accf36febce751021888de5f15090f4875b56", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "ca33df36aa0143a1d04f57d2086020c12e7eddb7", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "163847552a571bd55094291f4ffcdc1de0f14a7b", "versionType": "git"}, {"status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "lessThan": "beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3", "versionType": "git"}], "programFiles": ["net/sctp/associola.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.2"}, {"status": "unaffected", "version": "0", "lessThan": "3.2", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.152", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.104", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.45", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.9", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sctp/associola.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec"}, {"url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"}, {"url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27"}, {"url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500"}, {"url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56"}, {"url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7"}, {"url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b"}, {"url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc->new_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc->new_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport's state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n Call Trace:\n sctp_outq_select_transport+0x549/0x8b0 [sctp]\n sctp_outq_flush+0x306/0x2c60 [sctp]\n sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n Allocated by task 197:\n sctp_transport_new+0x68/0x650 [sctp]\n sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x77/0xb70\n sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport->state at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "3.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.2"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:12.552Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74586", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:58.687Z", "dateReserved": "2026-08-15T05:44:03.918Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:31:39.094Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sctp/associola.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "c0f973bb5118dd1b146cda3fcc8af6f6057befec", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "3b539b317cd052236fed0350364ff1268996ba46", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "db9d8e3b670f841755bc2018f178472dc6064d27", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "31efa656cf6aface26e88f038c14f22ee6ca1500", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "291accf36febce751021888de5f15090f4875b56", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "ca33df36aa0143a1d04f57d2086020c12e7eddb7", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "163847552a571bd55094291f4ffcdc1de0f14a7b", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}, {"lessThan": "beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3", "status": "affected", "version": "6af29ccc223b0feb6fc6112281c3fa3cdb1afddf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sctp/associola.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.2"}, {"lessThan": "3.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: clear new_transport when removing a peer\n\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc->new_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\n\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc->new_transport, leaving it pointing to the removed transport.\n\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport's state.\n\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\n\n BUG: KASAN: slab-use-after-free in sctp_outq_select_transport\n Read of size 4 at addr ffff88800b9bd95c by task python3/197\n\n Call Trace:\n sctp_outq_select_transport+0x549/0x8b0 [sctp]\n sctp_outq_flush+0x306/0x2c60 [sctp]\n sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\n Allocated by task 197:\n sctp_transport_new+0x68/0x650 [sctp]\n sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x77/0xb70\n sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nThe first invalid access was a four-byte read of transport->state at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\n\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsctp: limpiar new_transport al eliminar un par\n\nsctp_process_asconf_param() almacena un transporte de par reci\u00e9n a\u00f1adido en asoc -> new_transport. Despu\u00e9s de que todos los par\u00e1metros en el fragmento ASCONF han sido procesados, sctp_sf_do_asconf() usa este puntero para enviar un HEARTBEAT al nuevo transporte.\n\nUn ASCONF autenticado de un par SCTP remoto puede a\u00f1adir un transporte y eliminarlo de nuevo con un par\u00e1metro DEL-IP comod\u00edn en el mismo fragmento. La eliminaci\u00f3n comod\u00edn preserva el transporte en el que lleg\u00f3 el ASCONF, pero elimina el transporte reci\u00e9n a\u00f1adido a trav\u00e9s de sctp_assoc_del_nonprimary_peers(). La eliminaci\u00f3n no limpia asoc -> new_transport, dej\u00e1ndolo apuntando al transporte eliminado.\n\nsctp_sf_do_asconf() entonces crea un HEARTBEAT cuyo chunk -> transport apunta al transporte eliminado sin mantener una referencia de transporte. Durante el reemplazo de direcci\u00f3n local, src_out_of_asoc_ok mantiene este HEARTBEAT en control_chunk_list. Despu\u00e9s de que el transporte es liberado por RCU, un ASCONF_ACK exitoso para la direcci\u00f3n de reemplazo libera el HEARTBEAT en cola y sctp_outq_select_transport() lee el estado del transporte liberado.\n\nEl problema fue encontrado durante una auditor\u00eda est\u00e1tica de objetos SCTP. Con un par autenticado, el reproductor activ\u00f3 el mismo informe KASAN en 2 de 2 ejecuciones sin parchear en un kernel netdev/main habilitado para KASAN:\n\nBUG: KASAN: uso despu\u00e9s de liberaci\u00f3n de slab en sctp_outq_select_transport\nLectura de tama\u00f1o 4 en la direcci\u00f3n ffff88800b9bd95c por la tarea python3/197\n\nTraza de Llamada:\n sctp_outq_select_transport+0x549/0x8b0 [sctp]\n sctp_outq_flush+0x306/0x2c60 [sctp]\n sctp_transport_immediate_rtx+0xaf/0x260 [sctp]\n sctp_process_asconf_ack+0xa48/0xf70 [sctp]\n\nAsignado por la tarea 197:\n sctp_transport_new+0x68/0x650 [sctp]\n sctp_assoc_add_peer+0x258/0x12a0 [sctp]\n sctp_process_asconf+0x5e9/0x1090 [sctp]\n\n\u00daltima creaci\u00f3n de trabajo potencialmente relacionada:\n __call_rcu_common.constprop.0+0x77/0xb70\n sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\n sctp_process_asconf+0xd9c/0x1090 [sctp]\n\nEl primer acceso inv\u00e1lido fue una lectura de cuatro bytes de transport -> state en net/sctp/outqueue.c:833. El mismo reproductor complet\u00f3 la secuencia completa de ASCONF autenticado y reemplazo de direcci\u00f3n local con este cambio sin un informe KASAN o oops.\n\nLimpiar new_transport cuando su par es eliminado, antes de que pueda ser usado para crear el HEARTBEAT."}], "id": "CVE-2026-74586", "lastModified": "2026-10-16T20:17:41.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74586", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:01:22.679570Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:30.687", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/163847552a571bd55094291f4ffcdc1de0f14a7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/291accf36febce751021888de5f15090f4875b56"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/31efa656cf6aface26e88f038c14f22ee6ca1500"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b539b317cd052236fed0350364ff1268996ba46"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c0f973bb5118dd1b146cda3fcc8af6f6057befec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca33df36aa0143a1d04f57d2086020c12e7eddb7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db9d8e3b670f841755bc2018f178472dc6064d27"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: sctp: clear new_transport when removing a peer", "id": "2521419", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521419"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsctp: clear new_transport when removing a peer\nsctp_process_asconf_param() stores a newly added peer transport in\nasoc->new_transport. After all parameters in the ASCONF chunk have been\nprocessed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the\nnew transport.\nAn authenticated ASCONF from a remote SCTP peer can add a transport and\nremove it again with a wildcard DEL-IP parameter in the same chunk. The\nwildcard deletion preserves the transport on which the ASCONF arrived, but\nremoves the newly added transport through\nsctp_assoc_del_nonprimary_peers(). The removal does not clear\nasoc->new_transport, leaving it pointing to the removed transport.\nsctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points\nto the removed transport without holding a transport reference. During\nlocal address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on\ncontrol_chunk_list. After the transport is freed by RCU, a successful\nASCONF_ACK for the replacement address releases the queued HEARTBEAT and\nsctp_outq_select_transport() reads the freed transport's state.\nThe issue was found during a static audit of SCTP objects. With an\nauthenticated peer, the reproducer triggered the same KASAN report in 2\nof 2 unpatched runs on a KASAN-enabled netdev/main kernel:\nBUG: KASAN: slab-use-after-free in sctp_outq_select_transport\nRead of size 4 at addr ffff88800b9bd95c by task python3/197\nCall Trace:\nsctp_outq_select_transport+0x549/0x8b0 [sctp]\nsctp_outq_flush+0x306/0x2c60 [sctp]\nsctp_transport_immediate_rtx+0xaf/0x260 [sctp]\nsctp_process_asconf_ack+0xa48/0xf70 [sctp]\nAllocated by task 197:\nsctp_transport_new+0x68/0x650 [sctp]\nsctp_assoc_add_peer+0x258/0x12a0 [sctp]\nsctp_process_asconf+0x5e9/0x1090 [sctp]\nLast potentially related work creation:\n__call_rcu_common.constprop.0+0x77/0xb70\nsctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp]\nsctp_process_asconf+0xd9c/0x1090 [sctp]\nThe first invalid access was a four-byte read of transport->state at\nnet/sctp/outqueue.c:833. The same reproducer completed the full\nauthenticated ASCONF and local-address replacement sequence with this\nchange without a KASAN report or oops.\nClear new_transport when its peer is removed, before it can be used to\ncreate the HEARTBEAT.", "A flaw was found in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation. An authenticated remote SCTP peer can trigger a use-after-free vulnerability by adding and then immediately removing a transport within the same ASCONF chunk. This can lead to a system crash, resulting in a denial of service."], "name": "CVE-2026-74586", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74586\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74586\nhttps://lore.kernel.org/linux-cve-announce/2026082212-CVE-2026-74586-9beb@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,c0f973bb5118dd1b146cda3fcc8af6f6057befec)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,3b539b317cd052236fed0350364ff1268996ba46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,db9d8e3b670f841755bc2018f178472dc6064d27)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,31efa656cf6aface26e88f038c14f22ee6ca1500)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,291accf36febce751021888de5f15090f4875b56)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,ca33df36aa0143a1d04f57d2086020c12e7eddb7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,163847552a571bd55094291f4ffcdc1de0f14a7b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[6af29ccc223b0feb6fc6112281c3fa3cdb1afddf,beb33f8ee1ca83acddb2a5ae80f3d22ec550b4c3)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T19:30:17.495455+00:00", "updated": "2026-08-25T21:30:06.895676+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}