CVE-2026-43139

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43139", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.988Z", "datePublished": "2026-05-06T11:27:24.898Z", "dateUpdated": "2026-10-19T19:16:22.034Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:11.398Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\n\nxfrm6_get_saddr() does not check the return value of\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\nsource address (returns -EADDRNOTAVAIL), saddr->in6 is left\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\n\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\naddress in xfrm_state_find(), triggering KMSAN warning:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\n xfrm_state_find+0x2424/0xa940\n xfrm_resolve_and_create_bundle+0x906/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x2ce1/0x3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x332b/0x3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n=====================================================\n\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\nthe error."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "baseScore": 8.6, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - A network-triggered path exists on an IPv6/IPsec endpoint: received IPv6 traffic that causes kernel-generated output, such as ICMPv6/NDISC replies or service responses, enters xfrm_lookup_route() and reaches xfrm_tmpl_resolve_one()->xfrm6_get_saddr(). The same code is locally reachable with sendmsg(), but a reasonably configured XFRM/IPsec host can be triggered by network traffic.\nAC:L - No race, heap grooming, or timing condition is required; once the affected outbound XFRM template has a wildcard IPv6 tunnel source and source address selection fails, the unchecked error path is deterministic. Matching output traffic can be triggered repeatedly.\nPR:N - The network trigger does not require the attacker to authenticate or hold local privileges. Creating the XFRM policy requires CAP_NET_ADMIN, including via a user/net namespace for local testing, but in the network scenario that policy is preexisting victim configuration.\nUI:N - No victim user action is required after the vulnerable XFRM/IPsec configuration is present. Packets or local sends directly drive the kernel output path.\nS:U - The bug affects kernel XFRM/IPv6 processing within the same host security authority. It does not cross a VM, IOMMU, or separate security scope boundary.\nC:L - The uninitialized value is a bounded 16-byte IPv6 source address from kernel stack, used in hashes/comparisons and potentially copied into XFRM acquire state/messages. This is limited kernel memory disclosure, not an arbitrary read primitive.\nI:L - The uninitialized source address can influence XFRM state lookup/acquire behavior and create or notify state using an unintended local tunnel endpoint. This is limited integrity impact to IPsec/XFRM state handling, not arbitrary modification.\nA:H - Syzbot reported a kernel BUG/KMSAN finding in xfrm_state_find(), and the bad value is consumed in core XFRM state lookup/acquire paths that can be triggered repeatedly. Kernel warning/oops/panic conditions are high availability impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/xfrm6_policy.c"], "versions": [{"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "4f28141786e1fe884ce42a5197ba9beed540f0ea", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "6535867673bf301d52aa00593a4d1d18cc3922fa", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "eb2ee15290af14c60b45cf2b73f5687d1d077d9b", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "719918fc88df6da023dfff370cd965151a5afd7f", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "dc0abce055134cb83b0d981d31ceb20dda419787", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "c7221e7bd8fc2ef38a0b27be580d9d202281306b", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "3dcd1664ac15eee6a690daec7c4ffc59190406f7", "status": "affected", "versionType": "git"}, {"version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "1799d8abeabc68ec05679292aaf6cba93b343c05", "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/ipv6/xfrm6_policy.c"], "versions": [{"version": "2.6.19", "status": "affected"}, {"version": "0", "lessThan": "2.6.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.252", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.202", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "2.6.19", "versionEndExcluding": "5.10.252"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "5.15.202"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea"}, {"url": "https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa"}, {"url": "https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b"}, {"url": "https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f"}, {"url": "https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787"}, {"url": "https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b"}, {"url": "https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7"}, {"url": "https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05"}], "title": "xfrm6: fix uninitialized saddr in xfrm6_get_saddr()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43139", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:07.789549Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-457", "description": "CWE-457 Use of Uninitialized Variable"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:16:22.034Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43139", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:15:07.789549Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-457", "description": "CWE-457 Use of Uninitialized Variable"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:15:08.380Z"}}], "cna": {"title": "xfrm6: fix uninitialized saddr in xfrm6_get_saddr()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.6, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - A network-triggered path exists on an IPv6/IPsec endpoint: received IPv6 traffic that causes kernel-generated output, such as ICMPv6/NDISC replies or service responses, enters xfrm_lookup_route() and reaches xfrm_tmpl_resolve_one()->xfrm6_get_saddr(). The same code is locally reachable with sendmsg(), but a reasonably configured XFRM/IPsec host can be triggered by network traffic.\nAC:L - No race, heap grooming, or timing condition is required; once the affected outbound XFRM template has a wildcard IPv6 tunnel source and source address selection fails, the unchecked error path is deterministic. Matching output traffic can be triggered repeatedly.\nPR:N - The network trigger does not require the attacker to authenticate or hold local privileges. Creating the XFRM policy requires CAP_NET_ADMIN, including via a user/net namespace for local testing, but in the network scenario that policy is preexisting victim configuration.\nUI:N - No victim user action is required after the vulnerable XFRM/IPsec configuration is present. Packets or local sends directly drive the kernel output path.\nS:U - The bug affects kernel XFRM/IPv6 processing within the same host security authority. It does not cross a VM, IOMMU, or separate security scope boundary.\nC:L - The uninitialized value is a bounded 16-byte IPv6 source address from kernel stack, used in hashes/comparisons and potentially copied into XFRM acquire state/messages. This is limited kernel memory disclosure, not an arbitrary read primitive.\nI:L - The uninitialized source address can influence XFRM state lookup/acquire behavior and create or notify state using an unintended local tunnel endpoint. This is limited integrity impact to IPsec/XFRM state handling, not arbitrary modification.\nA:H - Syzbot reported a kernel BUG/KMSAN finding in xfrm_state_find(), and the bad value is consumed in core XFRM state lookup/acquire paths that can be triggered repeatedly. Kernel warning/oops/panic conditions are high availability impact."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "4f28141786e1fe884ce42a5197ba9beed540f0ea", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "6535867673bf301d52aa00593a4d1d18cc3922fa", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "eb2ee15290af14c60b45cf2b73f5687d1d077d9b", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "719918fc88df6da023dfff370cd965151a5afd7f", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "dc0abce055134cb83b0d981d31ceb20dda419787", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "c7221e7bd8fc2ef38a0b27be580d9d202281306b", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "3dcd1664ac15eee6a690daec7c4ffc59190406f7", "versionType": "git"}, {"status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "lessThan": "1799d8abeabc68ec05679292aaf6cba93b343c05", "versionType": "git"}], "programFiles": ["net/ipv6/xfrm6_policy.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.19", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.252", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.202", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.165", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.128", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.75", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.16", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.6", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/xfrm6_policy.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea"}, {"url": "https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa"}, {"url": "https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b"}, {"url": "https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f"}, {"url": "https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787"}, {"url": "https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b"}, {"url": "https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7"}, {"url": "https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\n\nxfrm6_get_saddr() does not check the return value of\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\nsource address (returns -EADDRNOTAVAIL), saddr->in6 is left\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\n\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\naddress in xfrm_state_find(), triggering KMSAN warning:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\n xfrm_state_find+0x2424/0xa940\n xfrm_resolve_and_create_bundle+0x906/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x2ce1/0x3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x332b/0x3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n=====================================================\n\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\nthe error."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.252", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.202", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.165", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.128", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.75", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.16", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.19.6", "versionStartIncluding": "2.6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0", "versionStartIncluding": "2.6.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:11.398Z"}}}, "cveMetadata": {"cveId": "CVE-2026-43139", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:16:22.034Z", "dateReserved": "2026-05-01T14:12:55.988Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-06T11:27:24.898Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/xfrm6_policy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4f28141786e1fe884ce42a5197ba9beed540f0ea", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "6535867673bf301d52aa00593a4d1d18cc3922fa", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "eb2ee15290af14c60b45cf2b73f5687d1d077d9b", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "719918fc88df6da023dfff370cd965151a5afd7f", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "dc0abce055134cb83b0d981d31ceb20dda419787", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "c7221e7bd8fc2ef38a0b27be580d9d202281306b", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "3dcd1664ac15eee6a690daec7c4ffc59190406f7", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}, {"lessThan": "1799d8abeabc68ec05679292aaf6cba93b343c05", "status": "affected", "version": "a1e59abf824969554b90facd44a4ab16e265afa4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/xfrm6_policy.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.19"}, {"lessThan": "2.6.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.252", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.202", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.165", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.128", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.75", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.16", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "128F081F-CEB9-49AD-8832-F177C6299DED", "versionEndExcluding": "5.10.252", "versionStartIncluding": "2.6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671", "versionEndExcluding": "5.15.202", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654", "versionEndExcluding": "6.1.165", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2", "versionEndExcluding": "6.6.128", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\n\nxfrm6_get_saddr() does not check the return value of\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\nsource address (returns -EADDRNOTAVAIL), saddr->in6 is left\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\n\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\naddress in xfrm_state_find(), triggering KMSAN warning:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\n xfrm_state_find+0x2424/0xa940\n xfrm_resolve_and_create_bundle+0x906/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x2ce1/0x3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x332b/0x3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n=====================================================\n\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\nthe error."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfrm6: correcci\u00f3n de saddr no inicializada en xfrm6_get_saddr()\n\nxfrm6_get_saddr() no comprueba el valor de retorno de ipv6_dev_get_saddr(). Cuando ipv6_dev_get_saddr() no logra encontrar una direcci\u00f3n de origen adecuada (devuelve -EADDRNOTAVAIL), saddr -> in6 queda sin inicializar, pero xfrm6_get_saddr() a\u00fan devuelve 0 (\u00e9xito).\n\nEsto hace que la funci\u00f3n llamadora xfrm_tmpl_resolve_one() use la direcci\u00f3n no inicializada en xfrm_state_find(), lo que activa la advertencia de KMSAN:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x 2424/0x a940\n xfrm_state_find+0x 2424/0x a940\n xfrm_resolve_and_create_bundle+0x906/0x 5a20\n xfrm_lookup_with_ifid+0xcc0/0x 3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x 2ce1/0x 3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x 332b/0x 3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x 5a20\n xfrm_lookup_with_ifid+0xcc0/0x 3770\n=====================================================\n\nSoluci\u00f3n comprobando el valor de retorno de ipv6_dev_get_saddr() y propagando el error."}], "id": "CVE-2026-43139", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.7, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43139", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:15:07.789549Z", "version": "2.0.3"}}]}, "published": "2026-05-06T12:16:31.227", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1799d8abeabc68ec05679292aaf6cba93b343c05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3dcd1664ac15eee6a690daec7c4ffc59190406f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4f28141786e1fe884ce42a5197ba9beed540f0ea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6535867673bf301d52aa00593a4d1d18cc3922fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/719918fc88df6da023dfff370cd965151a5afd7f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c7221e7bd8fc2ef38a0b27be580d9d202281306b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc0abce055134cb83b0d981d31ceb20dda419787"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb2ee15290af14c60b45cf2b73f5687d1d077d9b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-457"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xfrm6: fix uninitialized saddr in xfrm6_get_saddr()", "id": "2467164", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467164"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-252", "details": ["A flaw was found in the Linux kernel's xfrm6 subsystem. This vulnerability occurs because the `xfrm6_get_saddr()` function does not properly check the return value of `ipv6_dev_get_saddr()`. This oversight can result in an uninitialized source address being used, potentially leading to system instability or a denial of service due to a kernel memory error."], "name": "CVE-2026-43139", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43139\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43139\nhttps://lore.kernel.org/linux-cve-announce/2026050624-CVE-2026-43139-64a2@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,4f28141786e1fe884ce42a5197ba9beed540f0ea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,6535867673bf301d52aa00593a4d1d18cc3922fa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,eb2ee15290af14c60b45cf2b73f5687d1d077d9b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,719918fc88df6da023dfff370cd965151a5afd7f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,dc0abce055134cb83b0d981d31ceb20dda419787)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,c7221e7bd8fc2ef38a0b27be580d9d202281306b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,3dcd1664ac15eee6a690daec7c4ffc59190406f7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a1e59abf824969554b90facd44a4ab16e265afa4,1799d8abeabc68ec05679292aaf6cba93b343c05)"}}], "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": "semver", "value": "2.6.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.252,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.202,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.165,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.128,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-06T16:45:07.019161+00:00", "updated": "2026-10-23T07:45:17.033215+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}