{"id":"CVE-2026-43101","state":"PUBLISHED","title":"ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()\n\nWe need to check __in6_dev_get() for possible NULL value, as\nsuggested by Yiming Qian.\n\nAlso add skb_dst_dev_rcu() instead of skb_dst_dev(),\nand two missing READ_ONCE().\n\nNote that @dev can't be NULL.","publishedAt":"2026-05-06T07:40:30.969Z","updatedAt":"2026-10-30T12:24:56.256Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"dd0d2827b3643ff307c766865f8e31eab5cbd1f5","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"34b8390ac0ba57004b90ea568ac06f50bf896a80","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"f87aa5d1a7f56727a768757613a303b4245444a1","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"4198aab6f000b4febb18ea820fea20634dd789c7","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"3719c234fa94c37c955b1ecd3742ef280ec135e6","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"4e65a8b8daa18d63255ec58964dd192c7fdd9f8b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ioam6.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ioam6.c"]}],"references":["https://git.kernel.org/stable/c/dd0d2827b3643ff307c766865f8e31eab5cbd1f5","https://git.kernel.org/stable/c/34b8390ac0ba57004b90ea568ac06f50bf896a80","https://git.kernel.org/stable/c/f87aa5d1a7f56727a768757613a303b4245444a1","https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7","https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6","https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b"],"weaknesses":[],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43101.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43101","state":"PUBLISHED","datePublished":"2026-05-06T07:40:30.969Z","dateUpdated":"2026-10-30T12:24:56.256Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:55.984Z"},"containers":{"cna":{"title":"ipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ioam: fix potential NULL dereferences in __ioam6_fill_trace_data()\n\nWe need to check __in6_dev_get() for possible NULL value, as\nsuggested by Yiming Qian.\n\nAlso add skb_dst_dev_rcu() instead of skb_dst_dev(),\nand two missing READ_ONCE().\n\nNote that @dev can't be NULL."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"dd0d2827b3643ff307c766865f8e31eab5cbd1f5","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"34b8390ac0ba57004b90ea568ac06f50bf896a80","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"f87aa5d1a7f56727a768757613a303b4245444a1","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"4198aab6f000b4febb18ea820fea20634dd789c7","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"3719c234fa94c37c955b1ecd3742ef280ec135e6","versionType":"git"},{"version":"9ee11f0fff205b4b3df9750bff5e94f97c71b6a0","status":"affected","lessThan":"4e65a8b8daa18d63255ec58964dd192c7fdd9f8b","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ioam6.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.24","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.14","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ioam6.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/dd0d2827b3643ff307c766865f8e31eab5cbd1f5"},{"url":"https://git.kernel.org/stable/c/34b8390ac0ba57004b90ea568ac06f50bf896a80"},{"url":"https://git.kernel.org/stable/c/f87aa5d1a7f56727a768757613a303b4245444a1"},{"url":"https://git.kernel.org/stable/c/4198aab6f000b4febb18ea820fea20634dd789c7"},{"url":"https://git.kernel.org/stable/c/3719c234fa94c37c955b1ecd3742ef280ec135e6"},{"url":"https://git.kernel.org/stable/c/4e65a8b8daa18d63255ec58964dd192c7fdd9f8b"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The vulnerable helper is reachable while processing IPv6 IOAM Hop-by-Hop options and IOAM LWT output for packets crossing an IOAM-enabled IPv6 node, so an attacker can trigger it with network traffic in a configured IOAM deployment.\nAC:L - Once IOAM is enabled/configured on the target path, triggering only requires a valid pre-allocated trace with ingress/egress interface ID fields and a route/device state where `__in6_dev_get()` returns NULL; there is no race or difficult timing requirement.\nPR:N - The attacker does not need credentials on the target to send the triggering IPv6 traffic; the administrative IOAM setup is a target deployment condition rather than an attacker privilege.\nUI:N - No victim user action is required after the vulnerable node is configured; packet processing alone reaches the dereference.\nS:U - The impact is within the same kernel/networking security authority and does not cross a VM, IOMMU, or similar boundary.\nC:N - The bug is a NULL pointer dereference of missing IPv6 device state, not an out-of-bounds read or information disclosure primitive.\nI:N - The fixed issue does not provide attacker-controlled writes or data modification; it only prevents dereferencing NULL `inet6_dev` pointers.\nA:H - A NULL pointer dereference in kernel packet processing can oops or panic the system, causing high availability impact."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:24:56.256Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.19.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}