{"id":"CVE-2026-99041","aliases":[],"cve":{"records":[{"id":"CVE-2026-99041","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.387Z","published":"2026-10-23T12:22:00.403Z","modified":"2026-10-30T12:41:14.790Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:41:14.790Z"}],"references":[{"url":"https://git.kernel.org/stable/c/2e151c74bcc53e3ed313bd1c21b0d5bb442edbc0","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/ba72ed1c8476ce68eb7152dfcbc5330cefcbaa91","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/b14a682ad7d45345701e08f9279d483a1da8b36c","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f5b143f4cd3fb7673df8d727550478a4b762908a","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/2d06cb25a497d3a7034ef9d172626c2d6620a0f1","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/8f27260b989f488760289276377db24fbfb20bfa","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/8bc60db48e8cba35488bbd6e1f94aa990afa275a","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.18.58"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"ip6_gre: remove obsolete ERSPAN PMTU update","titleSource":"Linux","descriptionSource":"Linux","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_gre: remove obsolete ERSPAN PMTU update\n\nA tc tunnel_key action can attach a METADATA_IP_TUNNEL dst to an skb,\nand mirred can redirect it to a native ip6erspan device. The legacy PMTU\nupdate in ip6erspan_tunnel_xmit() treats that metadata dst as a route.\nSince it has no output device, dst_dev(dst)->mtu dereferences NULL.\n\nOn v7.2 with KASAN, an initial UID/GID 65534 process with CapEff 0 used\nself-created user and network namespaces to trigger:\n\n  KASAN: null-ptr-deref\n  RIP: ip6erspan_tunnel_xmit+0x10fc/0x2cc0\n  Kernel panic - not syncing: Fatal exception in interrupt\n\nThe update is obsolete. Commit fe1a4ca0a2b7 (\"ip6_gre: process toobig\nin a better way\") changed IPv6 GRE Too Big handling to update the\nunderlay route and removed the equivalent block from __gre6_xmit().\nip6_tnl_xmit() then propagates the underlay PMTU to the overlay route.\n\nRemove the stale ERSPAN copy and its now-unused dst variable. This\neliminates the metadata-dst dereference and keeps ERSPAN aligned with\nIPv6 GRE PMTU handling.","score":null,"severity":"unknown","published":"2026-10-23T12:22:00.403Z","modified":"2026-10-30T12:41:14.790Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"2e151c74bcc53e3ed313bd1c21b0d5bb442edbc0","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"ba72ed1c8476ce68eb7152dfcbc5330cefcbaa91","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"b14a682ad7d45345701e08f9279d483a1da8b36c","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"f5b143f4cd3fb7673df8d727550478a4b762908a","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"2d06cb25a497d3a7034ef9d172626c2d6620a0f1","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"8f27260b989f488760289276377db24fbfb20bfa","versionType":"git"},{"version":"5a963eb61b7c39e6c422b6e48619d19d04719358","status":"affected","lessThan":"8bc60db48e8cba35488bbd6e1f94aa990afa275a","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99041"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"4.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.16","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"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":"6.18.58","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-99041"}],"remediation":[],"references":["https://git.kernel.org/stable/c/2e151c74bcc53e3ed313bd1c21b0d5bb442edbc0","https://git.kernel.org/stable/c/ba72ed1c8476ce68eb7152dfcbc5330cefcbaa91","https://git.kernel.org/stable/c/b14a682ad7d45345701e08f9279d483a1da8b36c","https://git.kernel.org/stable/c/f5b143f4cd3fb7673df8d727550478a4b762908a","https://git.kernel.org/stable/c/2d06cb25a497d3a7034ef9d172626c2d6620a0f1","https://git.kernel.org/stable/c/8f27260b989f488760289276377db24fbfb20bfa","https://git.kernel.org/stable/c/8bc60db48e8cba35488bbd6e1f94aa990afa275a"],"sources":[{"name":"CVE","id":"CVE-2026-99041","modified":"2026-10-30T12:41:14.790Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-99041"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-30T13:11:19.155Z","kev":{"status":"not-listed","checkedAt":"2026-11-14T22:40:32.870Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"The Linux kernel has a vulnerability in ip6_gre where a null pointer dereference can occur, potentially causing a kernel panic. This issue affects Linux kernel versions starting from 4.16. An attacker with access to a vulnerable system may be able to trigger this issue. The vulnerability is due to an obsolete ERSPAN PMTU update.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T13:36:22.603Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-99041"}]}}