{"id":"CVE-2026-74398","revision":"8cddacc0e4e045979b1a84b96a266694","records":[{"revision":"8cddacc0e4e045979b1a84b96a266694","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74398","aliases":[],"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":0,"publishedAt":"2026-08-15T05:59:10.113+00:00","modifiedAt":"2026-10-16T19:05:41.331+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/addrconf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"47b05836705b63dab93d9ac7c69a3a507375ef80\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"d21be7d051012c6b572fa4e3334443c250216f7b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"875c284c0f98b042bb97abad460f63a24c977f88\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"8ed0ce9ea58d677d1bac92614ee5f60f8ea57363\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"b61af0268e3d1308c466bf0be5dced844eafc1ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"e889aa99ad3ed48bb0ddcff6475b17542532d18b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\n                            \"lessThan\": \"627ac78f2741e2ebd2225e2e953b6964a8a9182f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"835b474b8f70fa68d68abffad37378e92f661802\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"3.10.105\",\n                            \"lessThan\": \"3.11\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv6/addrconf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80","https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b","https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88","https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363","https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb","https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef","https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b","https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74398","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74398","identifiers":["CVE-2026-74398"]},"retained":false,"historicalAffected":[]}],"coverage":[]}