{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23083","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.960Z","datePublished":"2026-02-04T16:08:07.561Z","dateUpdated":"2026-05-11T21:59:40.268Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T21:59:40.268Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfou: Don't allow 0 for FOU_ATTR_IPPROTO.\n\nfou_udp_recv() has the same problem mentioned in the previous\npatch.\n\nIf FOU_ATTR_IPPROTO is set to 0, skb is not freed by\nfou_udp_recv() nor \"resubmit\"-ted in ip_protocol_deliver_rcu().\n\nLet's forbid 0 for FOU_ATTR_IPPROTO."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/netlink/specs/fou.yaml","net/ipv4/fou_nl.c"],"versions":[{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"c7498f9bc390479ccfad7c7f2332237ff4945b03","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"6e983789b7588ee59cbf303583546c043bad8e19","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"1cc98b8887cabb1808d2f4a37cd10a7be7574771","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"b7db31a52c3862a1a32202a273a4c32e7f5f4823","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"9b75dff8446ec871030d8daf5a69e74f5fe8b956","status":"affected","versionType":"git"},{"version":"23461551c00628c3f3fe9cf837bf53cf8f212b63","lessThan":"7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/netlink/specs/fou.yaml","net/ipv4/fou_nl.c"],"versions":[{"version":"3.18","status":"affected"},{"version":"0","lessThan":"3.18","status":"unaffected","versionType":"semver"},{"version":"5.10.249","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.199","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.162","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.122","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.68","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.8","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","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":"3.18","versionEndExcluding":"5.10.249"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.15.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.1.162"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.6.122"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.12.68"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03"},{"url":"https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea"},{"url":"https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19"},{"url":"https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771"},{"url":"https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823"},{"url":"https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956"},{"url":"https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5"}],"title":"fou: Don't allow 0 for FOU_ATTR_IPPROTO.","x_generator":{"engine":"bippy-1.2.0"}}}}