{"id":"DEBIAN-CVE-2026-74398","details":"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-\u003estate from DAD to POSTDAD via addrconf_dad_end(), which drops ifp-\u003elock 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-\u003estate to DEAD and run list_del_rcu(&ifp-\u003eif_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-\u003elock critical section.  The STABLE_PRIVACY branch temporarily drops ifp-\u003elock 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.","modified":"2026-09-14T17:03:52.998304945Z","published":"2026-08-15T06:22:41.790Z","upstream":["CVE-2026-74398"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-74398"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.180-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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