{"apiVersion":"1.0","identifier":"CVE-2026-74398","description":"In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released.","publishedAt":"2026-08-15T06:22:41","lastModifiedAt":"2026-08-17T06:19:34","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398","cvssScore":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00514,"riskScore":1.03,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74398","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74398","en":"https://www.redsauce.net/en/cves/CVE-2026-74398","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74398","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74398","de":"https://www.redsauce.net/de/cves/CVE-2026-74398","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74398","el":"https://www.redsauce.net/el/cves/CVE-2026-74398"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74398"}}