{"api_version":"1","generated_at":"2026-08-15T08:44:36+00:00","cve":"CVE-2026-74398","urls":{"html":"https://cve.report/CVE-2026-74398","api":"https://cve.report/api/cve/CVE-2026-74398.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74398","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398"},"summary":{"title":"ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:41","updated_at":"2026-08-15 06:22:41"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80","name":"https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f","name":"https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88","name":"https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb","name":"https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b","name":"https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef","name":"https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b","name":"https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363","name":"https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74398","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 47b05836705b63dab93d9ac7c69a3a507375ef80 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 d21be7d051012c6b572fa4e3334443c250216f7b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 875c284c0f98b042bb97abad460f63a24c977f88 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 b61af0268e3d1308c466bf0be5dced844eafc1ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 e889aa99ad3ed48bb0ddcff6475b17542532d18b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c15b1ccadb323ea50023e8f1cca2954129a62b51 627ac78f2741e2ebd2225e2e953b6964a8a9182f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 835b474b8f70fa68d68abffad37378e92f661802 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.10.105 3.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.261 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv6/addrconf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"47b05836705b63dab93d9ac7c69a3a507375ef80","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"d21be7d051012c6b572fa4e3334443c250216f7b","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"875c284c0f98b042bb97abad460f63a24c977f88","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"8ed0ce9ea58d677d1bac92614ee5f60f8ea57363","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"b61af0268e3d1308c466bf0be5dced844eafc1ef","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"e889aa99ad3ed48bb0ddcff6475b17542532d18b","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"lessThan":"627ac78f2741e2ebd2225e2e953b6964a8a9182f","status":"affected","version":"c15b1ccadb323ea50023e8f1cca2954129a62b51","versionType":"git"},{"status":"affected","version":"835b474b8f70fa68d68abffad37378e92f661802","versionType":"git"},{"lessThan":"3.11","status":"affected","version":"3.10.105","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv6/addrconf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.14"},{"lessThan":"3.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"3.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10.105","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."}],"providerMetadata":{"dateUpdated":"2026-08-15T05:59:10.113Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"},{"url":"https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"},{"url":"https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"},{"url":"https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"},{"url":"https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"},{"url":"https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"},{"url":"https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"},{"url":"https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"}],"title":"ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74398","datePublished":"2026-08-15T05:59:10.113Z","dateReserved":"2026-08-15T05:44:03.891Z","dateUpdated":"2026-08-15T05:59:10.113Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:41","lastModifiedDate":"2026-08-15 06:22:41","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74398","Ordinal":"1","Title":"ipv6: addrconf: bail out of dad_failure when state is no longer ","CVE":"CVE-2026-74398","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74398","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released.","Type":"Description","Title":"ipv6: addrconf: bail out of dad_failure when state is no longer "}]}}}