{"api_version":"1","generated_at":"2026-04-19T01:14:03+00:00","cve":"CVE-2026-23304","urls":{"html":"https://cve.report/CVE-2026-23304","api":"https://cve.report/api/cve/CVE-2026-23304.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-23304","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-23304"},"summary":{"title":"ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-03-25 11:16:26","updated_at":"2026-04-18 09:16:18"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f","name":"https://git.kernel.org/stable/c/3310fc11fc47387d1dd4759b0bc961643ea11c7f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d542e2ac7f9e288d49735be0775611547ca4e0ee","name":"https://git.kernel.org/stable/c/d542e2ac7f9e288d49735be0775611547ca4e0ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4","name":"https://git.kernel.org/stable/c/4a48fe59f29f673a3d042d679f26629a9c3e29d4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee","name":"https://git.kernel.org/stable/c/0b5a7826020706057cc5a9d9009e667027f221ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a","name":"https://git.kernel.org/stable/c/2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34","name":"https://git.kernel.org/stable/c/581800298313c9fd75e94985e6d37d21b7e35d34","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e","name":"https://git.kernel.org/stable/c/ae88c8256547b63980770a9ea7be73a15900d27e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a73fe9f4ae84a239d5b2686f47a58c158aee2eb4","name":"https://git.kernel.org/stable/c/a73fe9f4ae84a239d5b2686f47a58c158aee2eb4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23304","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23304","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d d542e2ac7f9e288d49735be0775611547ca4e0ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d a73fe9f4ae84a239d5b2686f47a58c158aee2eb4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d 4a48fe59f29f673a3d042d679f26629a9c3e29d4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d 581800298313c9fd75e94985e6d37d21b7e35d34 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d 3310fc11fc47387d1dd4759b0bc961643ea11c7f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d 0b5a7826020706057cc5a9d9009e667027f221ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d ae88c8256547b63980770a9ea7be73a15900d27e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4832c30d5458387ff2533ff66fbde26ad8bb5a2d 2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.253 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.167 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.130 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.77 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.17 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.7 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"23304","cve":"CVE-2026-23304","epss":"0.000320000","percentile":"0.090980000","score_date":"2026-04-18","updated_at":"2026-04-19 00:10:43"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d542e2ac7f9e288d49735be0775611547ca4e0ee","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"a73fe9f4ae84a239d5b2686f47a58c158aee2eb4","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"4a48fe59f29f673a3d042d679f26629a9c3e29d4","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"581800298313c9fd75e94985e6d37d21b7e35d34","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"3310fc11fc47387d1dd4759b0bc961643ea11c7f","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"0b5a7826020706057cc5a9d9009e667027f221ee","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"ae88c8256547b63980770a9ea7be73a15900d27e","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"},{"lessThan":"2ffb4f5c2ccb2fa1c049dd11899aee7967deef5a","status":"affected","version":"4832c30d5458387ff2533ff66fbde26ad8bb5a2d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/route.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.14"},{"lessThan":"4.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.167","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.130","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.77","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.17","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.167","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.130","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.77","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.17","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.7","versionStartIncluding":"4.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"4.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-04-18T08:57:51.949Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-23304","datePublished":"2026-03-25T10:26:59.015Z","dateReserved":"2026-01-13T15:37:45.993Z","dateUpdated":"2026-04-18T08:57:51.949Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-03-25 11:16:26","lastModifiedDate":"2026-04-18 09:16:18","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"23304","Ordinal":"1","Title":"ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()","CVE":"CVE-2026-23304","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"23304","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ipv6: fix NULL pointer deref in ip6_rt_get_dev_rcu()"}]}}}