Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before 47b05836705b63dab93d9ac7c69a3a507375ef80; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before d21be7d051012c6b572fa4e3334443c250216f7b; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before 875c284c0f98b042bb97abad460f63a24c977f88; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before b61af0268e3d1308c466bf0be5dced844eafc1ef; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before e889aa99ad3ed48bb0ddcff6475b17542532d18b; affected c15b1ccadb323ea50023e8f1cca2954129a62b51 before 627ac78f2741e2ebd2225e2e953b6964a8a9182f; affected 835b474b8f70fa68d68abffad37378e92f661802; affected 3.10.105 before 3.11 |
| Linux / Linux | affected 3.14; unaffected 0 before 3.14; unaffected 5.10.261 through 5.10.*; unaffected 5.15.212 through 5.15.*; unaffected 6.1.178 through 6.1.*; unaffected 6.6.145 through 6.6.*; unaffected 6.12.97 through 6.12.*; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
No references supplied.