{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23304","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.993Z","datePublished":"2026-03-25T10:26:59.015Z","dateUpdated":"2026-05-11T22:04:17.686Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:04:17.686Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()\n\nl3mdev_master_dev_rcu() can return NULL when the slave device is being\nun-slaved from a VRF. All other callers deal with this, but we lost\nthe fallback to loopback in ip6_rt_pcpu_alloc() -> ip6_rt_get_dev_rcu()\nwith commit 4832c30d5458 (\"net: ipv6: put host and anycast routes on\ndevice with address\").\n\n  KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f]\n  RIP: 0010:ip6_rt_pcpu_alloc (net/ipv6/route.c:1418)\n  Call Trace:\n   ip6_pol_route (net/ipv6/route.c:2318)\n   fib6_rule_lookup (net/ipv6/fib6_rules.c:115)\n   ip6_route_output_flags (net/ipv6/route.c:2607)\n   vrf_process_v6_outbound (drivers/net/vrf.c:437)\n\nI was tempted to rework the un-slaving code to clear the flag first\nand insert synchronize_rcu() before we remove the upper. But looks like\nthe explicit fallback to loopback_dev is an established pattern.\nAnd I guess avoiding the synchronize_rcu() is nice, too."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/route.c"],"versions":[{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"d542e2ac7f9e288d49735be0775611547ca4e0ee","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"a73fe9f4ae84a239d5b2686f47a58c158aee2eb4","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"4a48fe59f29f673a3d042d679f26629a9c3e29d4","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"581800298313c9fd75e94985e6d37d21b7e35d34","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"3310fc11fc47387d1dd4759b0bc961643ea11c7f","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"0b5a7826020706057cc5a9d9009e667027f221ee","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"ae88c8256547b63980770a9ea7be73a15900d27e","status":"affected","versionType":"git"},{"version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","lessThan":"2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a","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/route.c"],"versions":[{"version":"4.14","status":"affected"},{"version":"0","lessThan":"4.14","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.77","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.17","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.7","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":"4.14","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/d542e2ac7f9e288d49735be0775611547ca4e0ee"},{"url":"https://git.kernel.org/stable/c/a73fe9f4ae84a239d5b2686f47a58c158aee2eb4"},{"url":"https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4"},{"url":"https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34"},{"url":"https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f"},{"url":"https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee"},{"url":"https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e"},{"url":"https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a"}],"title":"ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()","x_generator":{"engine":"bippy-1.2.0"}}}}