CVE-2026-68297

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68297", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.380Z", "datePublished": "2026-08-10T12:02:30.721Z", "dateUpdated": "2026-10-19T21:09:03.754Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:32:46.091Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix u16 MTU truncation in media and bearer MTU validation\n\nBoth TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied\nMTU values but only enforce a minimum bound, not a maximum. When a user\nsets the MTU to a value exceeding U16_MAX (65535), it passes validation\nbut is silently truncated when assigned to u16 fields l->mtu and\nl->advertised_mtu in tipc_link_create(). Values like 65536 (0x10000)\ntruncate to 0, causing a division by zero in tipc_link_set_queue_limits()\nwhich computes TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE). Other overflowing\nvalues (e.g. 65537-131071) produce small incorrect MTU values, resulting\nin link malfunction behaviors.\n\nCrash stack (triggered as unprivileged user via user namespace):\n\n tipc_link_set_queue_limits net/tipc/link.c:2531\n tipc_link_create net/tipc/link.c:520\n tipc_node_check_dest net/tipc/node.c:1279\n tipc_disc_rcv net/tipc/discover.c:252\n tipc_rcv net/tipc/node.c:2129\n tipc_udp_recv net/tipc/udp_media.c:392\n\nTwo independent paths lack the upper bound check:\n1. tipc_udp_mtu_bad() -- called from __tipc_nl_media_set() (MEDIA_SET)\n2. inline check in __tipc_nl_bearer_set() at bearer.c:1160 (BEARER_SET)\n\nFix both by rejecting MTU values above U16_MAX."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The attack begins with a local TIPC netlink command (TIPC_NL_BEARER_SET/TIPC_NL_MEDIA_SET) setting an out-of-range MTU, with the crash/corruption then triggered by locally generated discovery traffic and sendmsg() in the attacker's own network namespace.\nAC:L - The attacker fully controls both the bad MTU value and the discovery packet that creates the link, so the truncation and subsequent divide-by-zero or undersized-fragment path trigger deterministically on every attempt.\nPR:L - Both netlink ops are gated by GENL_UNS_ADMIN_PERM, i.e. CAP_NET_ADMIN in the owning user namespace, which any unprivileged user obtains via `unshare -Urn`; the commit message explicitly reports the crash reproduced as an unprivileged user through a user namespace.\nUI:N - The attacker performs every step (bearer setup, MTU configuration, packet injection, sendmsg) with no action from any other user or administrator.\nS:U - The truncated MTU corrupts only kernel state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Truncated MTUs below the TIPC header size propagate into tipc_msg_build() as pktmax, driving negative fragment remainders and oversized copies into undersized skbs; the resulting heap corruption and adjacent-object exposure can be leveraged to read kernel memory.\nI:H - The undersized-fragment path writes INT_H_SIZE plus header bytes and then a negative-length (huge unsigned) user copy into a buffer allocated at the truncated MTU size, giving an attacker-controlled linear heap overflow suitable for control-flow hijacking.\nA:H - MTU values truncating to under 20 make tipc_link_set_queue_limits() divide by zero inside tipc_link_create(), which runs in softirq context from tipc_udp_recv()/tipc_disc_rcv(), producing a kernel oops that is typically fatal in interrupt context."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tipc/netlink.c"], "versions": [{"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "8bfdfe0dbb36a650b7c4dec1aeae078319938a0b", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "dc4b577a083b361d25e118dc96d8281255ebe22c", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "dfdfd987f1917c84766e097a6120a1f3f1634940", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "f02334a9e378f7e07232b26dc3d2ab353339f040", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "f4013598b69457dbea350df52e52daea6faef8eb", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "1b8fb5a20508bfb0db854e01214888c761b3a911", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "c1cda72f6acec02ebd45d913bf8527ff77336ba6", "status": "affected", "versionType": "git"}, {"version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8", "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/tipc/netlink.c"], "versions": [{"version": "4.18", "status": "affected"}, {"version": "0", "lessThan": "4.18", "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": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "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": "4.18", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8bfdfe0dbb36a650b7c4dec1aeae078319938a0b"}, {"url": "https://git.kernel.org/stable/c/dc4b577a083b361d25e118dc96d8281255ebe22c"}, {"url": "https://git.kernel.org/stable/c/dfdfd987f1917c84766e097a6120a1f3f1634940"}, {"url": "https://git.kernel.org/stable/c/f02334a9e378f7e07232b26dc3d2ab353339f040"}, {"url": "https://git.kernel.org/stable/c/f4013598b69457dbea350df52e52daea6faef8eb"}, {"url": "https://git.kernel.org/stable/c/1b8fb5a20508bfb0db854e01214888c761b3a911"}, {"url": "https://git.kernel.org/stable/c/c1cda72f6acec02ebd45d913bf8527ff77336ba6"}, {"url": "https://git.kernel.org/stable/c/9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8"}], "title": "tipc: fix u16 MTU truncation in media and bearer MTU validation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68297", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:46:47.440623Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T21:09:03.754Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-68297", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:46:47.440623Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-190", "description": "CWE-190 Integer Overflow or Wraparound"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:46:48.094Z"}}], "cna": {"title": "tipc: fix u16 MTU truncation in media and bearer MTU validation", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The attack begins with a local TIPC netlink command (TIPC_NL_BEARER_SET/TIPC_NL_MEDIA_SET) setting an out-of-range MTU, with the crash/corruption then triggered by locally generated discovery traffic and sendmsg() in the attacker's own network namespace.\nAC:L - The attacker fully controls both the bad MTU value and the discovery packet that creates the link, so the truncation and subsequent divide-by-zero or undersized-fragment path trigger deterministically on every attempt.\nPR:L - Both netlink ops are gated by GENL_UNS_ADMIN_PERM, i.e. CAP_NET_ADMIN in the owning user namespace, which any unprivileged user obtains via `unshare -Urn`; the commit message explicitly reports the crash reproduced as an unprivileged user through a user namespace.\nUI:N - The attacker performs every step (bearer setup, MTU configuration, packet injection, sendmsg) with no action from any other user or administrator.\nS:U - The truncated MTU corrupts only kernel state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Truncated MTUs below the TIPC header size propagate into tipc_msg_build() as pktmax, driving negative fragment remainders and oversized copies into undersized skbs; the resulting heap corruption and adjacent-object exposure can be leveraged to read kernel memory.\nI:H - The undersized-fragment path writes INT_H_SIZE plus header bytes and then a negative-length (huge unsigned) user copy into a buffer allocated at the truncated MTU size, giving an attacker-controlled linear heap overflow suitable for control-flow hijacking.\nA:H - MTU values truncating to under 20 make tipc_link_set_queue_limits() divide by zero inside tipc_link_create(), which runs in softirq context from tipc_udp_recv()/tipc_disc_rcv(), producing a kernel oops that is typically fatal in interrupt context."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "8bfdfe0dbb36a650b7c4dec1aeae078319938a0b", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "dc4b577a083b361d25e118dc96d8281255ebe22c", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "dfdfd987f1917c84766e097a6120a1f3f1634940", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "f02334a9e378f7e07232b26dc3d2ab353339f040", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "f4013598b69457dbea350df52e52daea6faef8eb", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "1b8fb5a20508bfb0db854e01214888c761b3a911", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "c1cda72f6acec02ebd45d913bf8527ff77336ba6", "versionType": "git"}, {"status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "lessThan": "9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8", "versionType": "git"}], "programFiles": ["net/tipc/netlink.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"status": "unaffected", "version": "0", "lessThan": "4.18", "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": "6.6.148", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.101", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/tipc/netlink.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/8bfdfe0dbb36a650b7c4dec1aeae078319938a0b"}, {"url": "https://git.kernel.org/stable/c/dc4b577a083b361d25e118dc96d8281255ebe22c"}, {"url": "https://git.kernel.org/stable/c/dfdfd987f1917c84766e097a6120a1f3f1634940"}, {"url": "https://git.kernel.org/stable/c/f02334a9e378f7e07232b26dc3d2ab353339f040"}, {"url": "https://git.kernel.org/stable/c/f4013598b69457dbea350df52e52daea6faef8eb"}, {"url": "https://git.kernel.org/stable/c/1b8fb5a20508bfb0db854e01214888c761b3a911"}, {"url": "https://git.kernel.org/stable/c/c1cda72f6acec02ebd45d913bf8527ff77336ba6"}, {"url": "https://git.kernel.org/stable/c/9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix u16 MTU truncation in media and bearer MTU validation\n\nBoth TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied\nMTU values but only enforce a minimum bound, not a maximum. When a user\nsets the MTU to a value exceeding U16_MAX (65535), it passes validation\nbut is silently truncated when assigned to u16 fields l->mtu and\nl->advertised_mtu in tipc_link_create(). Values like 65536 (0x10000)\ntruncate to 0, causing a division by zero in tipc_link_set_queue_limits()\nwhich computes TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE). Other overflowing\nvalues (e.g. 65537-131071) produce small incorrect MTU values, resulting\nin link malfunction behaviors.\n\nCrash stack (triggered as unprivileged user via user namespace):\n\n tipc_link_set_queue_limits net/tipc/link.c:2531\n tipc_link_create net/tipc/link.c:520\n tipc_node_check_dest net/tipc/node.c:1279\n tipc_disc_rcv net/tipc/discover.c:252\n tipc_rcv net/tipc/node.c:2129\n tipc_udp_recv net/tipc/udp_media.c:392\n\nTwo independent paths lack the upper bound check:\n1. tipc_udp_mtu_bad() -- called from __tipc_nl_media_set() (MEDIA_SET)\n2. inline check in __tipc_nl_bearer_set() at bearer.c:1160 (BEARER_SET)\n\nFix both by rejecting MTU values above U16_MAX."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.148", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.101", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.42", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.6", "versionStartIncluding": "4.18"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "4.18"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:32:46.091Z"}}}, "cveMetadata": {"cveId": "CVE-2026-68297", "state": "PUBLISHED", "dateUpdated": "2026-10-19T21:09:03.754Z", "dateReserved": "2026-07-30T09:28:09.380Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-10T12:02:30.721Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/tipc/netlink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8bfdfe0dbb36a650b7c4dec1aeae078319938a0b", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "dc4b577a083b361d25e118dc96d8281255ebe22c", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "dfdfd987f1917c84766e097a6120a1f3f1634940", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "f02334a9e378f7e07232b26dc3d2ab353339f040", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "f4013598b69457dbea350df52e52daea6faef8eb", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "1b8fb5a20508bfb0db854e01214888c761b3a911", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "c1cda72f6acec02ebd45d913bf8527ff77336ba6", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}, {"lessThan": "9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8", "status": "affected", "version": "901271e0403af638c224987c2a4e55cebade7e91", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/tipc/netlink.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.18"}, {"lessThan": "4.18", "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": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "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\ntipc: fix u16 MTU truncation in media and bearer MTU validation\n\nBoth TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied\nMTU values but only enforce a minimum bound, not a maximum. When a user\nsets the MTU to a value exceeding U16_MAX (65535), it passes validation\nbut is silently truncated when assigned to u16 fields l->mtu and\nl->advertised_mtu in tipc_link_create(). Values like 65536 (0x10000)\ntruncate to 0, causing a division by zero in tipc_link_set_queue_limits()\nwhich computes TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE). Other overflowing\nvalues (e.g. 65537-131071) produce small incorrect MTU values, resulting\nin link malfunction behaviors.\n\nCrash stack (triggered as unprivileged user via user namespace):\n\n tipc_link_set_queue_limits net/tipc/link.c:2531\n tipc_link_create net/tipc/link.c:520\n tipc_node_check_dest net/tipc/node.c:1279\n tipc_disc_rcv net/tipc/discover.c:252\n tipc_rcv net/tipc/node.c:2129\n tipc_udp_recv net/tipc/udp_media.c:392\n\nTwo independent paths lack the upper bound check:\n1. tipc_udp_mtu_bad() -- called from __tipc_nl_media_set() (MEDIA_SET)\n2. inline check in __tipc_nl_bearer_set() at bearer.c:1160 (BEARER_SET)\n\nFix both by rejecting MTU values above U16_MAX."}], "id": "CVE-2026-68297", "lastModified": "2026-10-19T22:17:12.037", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68297", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:46:47.440623Z", "version": "2.0.3"}}]}, "published": "2026-08-10T13:20:19.173", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1b8fb5a20508bfb0db854e01214888c761b3a911"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8bfdfe0dbb36a650b7c4dec1aeae078319938a0b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c1cda72f6acec02ebd45d913bf8527ff77336ba6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc4b577a083b361d25e118dc96d8281255ebe22c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dfdfd987f1917c84766e097a6120a1f3f1634940"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f02334a9e378f7e07232b26dc3d2ab353339f040"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f4013598b69457dbea350df52e52daea6faef8eb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: tipc: fix u16 MTU truncation in media and bearer MTU validation", "id": "2513437", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513437"}, "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-369", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntipc: fix u16 MTU truncation in media and bearer MTU validation\nBoth TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept user-supplied\nMTU values but only enforce a minimum bound, not a maximum. When a user\nsets the MTU to a value exceeding U16_MAX (65535), it passes validation\nbut is silently truncated when assigned to u16 fields l->mtu and\nl->advertised_mtu in tipc_link_create(). Values like 65536 (0x10000)\ntruncate to 0, causing a division by zero in tipc_link_set_queue_limits()\nwhich computes TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE). Other overflowing\nvalues (e.g. 65537-131071) produce small incorrect MTU values, resulting\nin link malfunction behaviors.\nCrash stack (triggered as unprivileged user via user namespace):\ntipc_link_set_queue_limits net/tipc/link.c:2531\ntipc_link_create net/tipc/link.c:520\ntipc_node_check_dest net/tipc/node.c:1279\ntipc_disc_rcv net/tipc/discover.c:252\ntipc_rcv net/tipc/node.c:2129\ntipc_udp_recv net/tipc/udp_media.c:392\nTwo independent paths lack the upper bound check:\n1. tipc_udp_mtu_bad() -- called from __tipc_nl_media_set() (MEDIA_SET)\n2. inline check in __tipc_nl_bearer_set() at bearer.c:1160 (BEARER_SET)\nFix both by rejecting MTU values above U16_MAX.", "A flaw was found in the Linux kernel's TIPC (Transparent Inter-Process Communication) module. A local user can exploit this vulnerability by providing a crafted Maximum Transmission Unit (MTU) value that exceeds the expected limit. This can lead to a division-by-zero error, causing a system crash and resulting in a denial of service. Incorrect MTU values can also lead to network link malfunctions."], "name": "CVE-2026-68297", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "2026-08-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68297\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68297\nhttps://lore.kernel.org/linux-cve-announce/2026081029-CVE-2026-68297-3b40@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901271e0403af638c224987c2a4e55cebade7e91,f02334a9e378f7e07232b26dc3d2ab353339f040)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901271e0403af638c224987c2a4e55cebade7e91,f4013598b69457dbea350df52e52daea6faef8eb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901271e0403af638c224987c2a4e55cebade7e91,1b8fb5a20508bfb0db854e01214888c761b3a911)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901271e0403af638c224987c2a4e55cebade7e91,c1cda72f6acec02ebd45d913bf8527ff77336ba6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[901271e0403af638c224987c2a4e55cebade7e91,9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8)"}}], "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": "4.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "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": "2026-08-10T17:15:03.145318+00:00", "updated": "2026-10-20T11:00:15.213914+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}