{"id":"CVE-2026-74398","summary":"ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD","details":"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-\u003estate from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp-\u003elock 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-\u003estate\nto DEAD and run list_del_rcu(&ifp-\u003eif_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-\u003elock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp-\u003elock 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.","modified":"2026-08-16T03:48:45.858639484Z","published":"2026-08-15T05:59:10.113Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74398.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"},{"type":"WEB","url":"https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74398.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c15b1ccadb323ea50023e8f1cca2954129a62b51"},{"fixed":"47b05836705b63dab93d9ac7c69a3a507375ef80"},{"fixed":"d21be7d051012c6b572fa4e3334443c250216f7b"},{"fixed":"875c284c0f98b042bb97abad460f63a24c977f88"},{"fixed":"8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"},{"fixed":"3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"},{"fixed":"b61af0268e3d1308c466bf0be5dced844eafc1ef"},{"fixed":"e889aa99ad3ed48bb0ddcff6475b17542532d18b"},{"fixed":"627ac78f2741e2ebd2225e2e953b6964a8a9182f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"835b474b8f70fa68d68abffad37378e92f661802"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3.10.105"},{"fixed":"3.11"}]}],"versions":["v3.10.104","v3.10.103","v3.10.102","v3.10.101","v3.10.100","v3.10.99","v3.10.98","v3.10.97","v3.10.96","v3.10.95","v3.10.94","v3.10.93","v3.10.92","v3.10.91","v3.10.90","v3.10.89","v3.10.88","v3.10.87","v3.10.86","v3.10.85","v3.10.84","v3.10.83","v3.10.82","v3.10.81","v3.10.80","v3.10.79","v3.10.78","v3.10.77","v3.10.76","v3.10.75","v3.10.74","v3.10.73","v3.10.72","v3.10.71","v3.10.70","v3.10.69","v3.10.68","v3.10.67","v3.10.66","v3.10.65","v3.10.64","v3.10.63","v3.10.62","v3.10.61","v3.10.60","v3.10.59","v3.10.58","v3.10.57","v3.10.56","v3.10.55","v3.10.54","v3.10.53","v3.10.52","v3.10.51","v3.10.50","v3.10.49","v3.10.48","v3.10.47","v3.10.46","v3.10.45","v3.10.44","v3.10.43","v3.10.42","v3.10.41","v3.10.40","v3.10.39","v3.10.38","v3.10.37","v3.10.36","v3.10.35","v3.10.34","v3.10.33","v3.10.32","v3.10.31","v3.10.30","v3.10.29","v3.10.28","v3.10.27","v3.10.26","v3.10.25","v3.10.24","v3.10.23","v3.10.22","v3.10.21","v3.10.20","v3.10.19","v3.10.18","v3.10.17","v3.10.16","v3.10.15","v3.10.14","v3.10.13","v3.10.12","v3.10.11","v3.10.10","v3.10.9","v3.10.8","v3.10.7","v3.10.6","v3.10.5","v3.10-rc2","v3.10.4","v3.10.3","v3.10.2","v3.10","v3.10.1","v3.10-rc7","v3.10-rc6","v3.10-rc1","v3.10-rc5","v3.10-rc3","v3.10-rc4","v3.9","v3.9-rc2","v3.9-rc7","v3.9-rc8","v3.9-rc3","v3.9-rc6","v3.9-rc5","v3.9-rc4","v3.9-rc1","v3.8","v3.8-rc7","v3.8-rc6","v3.8-rc5","v3.8-rc2","v3.8-rc1","v3.8-rc3","v3.8-rc4","v3.7","v3.7-rc1","v3.6","v3.7-rc6","v3.7-rc7","v3.7-rc3","v3.7-rc8","v3.7-rc2","v3.7-rc4","v3.7-rc5","v3.6-rc7","v3.6-rc1","v3.5-rc3","v3.6-rc6","v3.6-rc5","v3.5","v3.6-rc3","v3.6-rc4","v3.6-rc2","v3.4-rc4","v3.5-rc7","v3.5-rc5","v3.5-rc6","v3.5-rc2","v3.5-rc1","v3.5-rc4","v3.4","v3.4-rc2","v3.4-rc1","v3.4-rc7","v3.4-rc6","v3.4-rc3","v3.4-rc5","v3.3","v3.3-rc6","v3.3-rc3","v3.3-rc7","v3.3-rc2","v3.3-rc5","v3.2","v3.3-rc4","v3.3-rc1","v3.2-rc4","v3.2-rc7","v3.2-rc6","v3.2-rc5","v3.2-rc3","v3.1","v3.2-rc2","v3.2-rc1","v3.1-rc1","v3.1-rc9","v3.1-rc8","v3.1-rc10","v3.1-rc7","v3.1-rc3","v3.1-rc2","v3.1-rc4","v3.1-rc5","v3.0","v3.1-rc6","v3.0-rc7","v3.0-rc4","v3.0-rc6","v3.0-rc5","v3.0-rc3","v3.0-rc1","v2.6.39","v3.0-rc2","v2.6.38","v2.6.39-rc2","v2.6.39-rc7","v2.6.39-rc5","v2.6.39-rc1","v2.6.38-rc7","v2.6.39-rc6","v2.6.39-rc4","v2.6.39-rc3","v2.6.37","v2.6.38-rc1","v2.6.38-rc8","v2.6.38-rc2","v2.6.38-rc6","v2.6.38-rc5","v2.6.38-rc4","v2.6.38-rc3","v2.6.37-rc4","v2.6.37-rc2","v2.6.36","v2.6.37-rc5","v2.6.37-rc8","v2.6.37-rc7","v2.6.37-rc6","v2.6.37-rc1","v2.6.37-rc3","v2.6.36-rc6","v2.6.35-rc4","v2.6.36-rc8","v2.6.35","v2.6.36-rc7","v2.6.36-rc3","v2.6.36-rc5","v2.6.36-rc4","v2.6.36-rc2","v2.6.36-rc1","v2.6.35-rc5","v2.6.35-rc6","v2.6.34","v2.6.35-rc3","v2.6.35-rc1","v2.6.35-rc2","v2.6.34-rc7","v2.6.34-rc6","v2.6.34-rc5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