Answer in brief
CVE-2026-74398 records a Critical severity (CVSS 9.8) vulnerability in ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <47b05836705b63dab93d9ac7c69a3a507375ef80 || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <d21be7d051012c6b572fa4e3334443c250216f7b || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <875c284c0f98b042bb97abad460f63a24c977f88 || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <b61af0268e3d1308c466bf0be5dced844eafc1ef || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <e889aa99ad3ed48bb0ddcff6475b17542532d18b || >=c15b1ccadb323ea50023e8f1cca2954129a62b51 <627ac78f2741e2ebd2225e2e953b6964a8a9182f || 835b474b8f70fa68d68abffad37378e92f661802 || >=3.10.105 <3.11 | 47b05836705b63dab93d9ac7c69a3a507375ef80, d21be7d051012c6b572fa4e3334443c250216f7b, 875c284c0f98b042bb97abad460f63a24c977f88, 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363, 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb, b61af0268e3d1308c466bf0be5dced844eafc1ef, e889aa99ad3ed48bb0ddcff6475b17542532d18b, 627ac78f2741e2ebd2225e2e953b6964a8a9182f, 3.11 |
| Linux/Linuxgeneric | 3.14 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.