ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74398
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:41 UTC
Updated2026-08-15 06:22:41 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 47b05836705b63dab93d9ac7c69a3a507375ef80 git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 d21be7d051012c6b572fa4e3334443c250216f7b git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 875c284c0f98b042bb97abad460f63a24c977f88 git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 b61af0268e3d1308c466bf0be5dced844eafc1ef git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 e889aa99ad3ed48bb0ddcff6475b17542532d18b git Not specified
CNA Linux Linux affected c15b1ccadb323ea50023e8f1cca2954129a62b51 627ac78f2741e2ebd2225e2e953b6964a8a9182f git Not specified
CNA Linux Linux affected 835b474b8f70fa68d68abffad37378e92f661802 git Not specified
CNA Linux Linux affected 3.10.105 3.11 semver Not specified
CNA Linux Linux affected 3.14 Not specified
CNA Linux Linux unaffected 3.14 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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