CVE-2026-74398: linux
Vulnerability summary
CVE-2026-74398 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 24 · Related 24Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.51%
Chance of exploitation in the next 30 days
Percentile
43%
Versus all other CVEs
30-day change
0.00 pp
From 0.51% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu169 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-34.34
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1013.13
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
- linux≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < 47b05836705b63dab93d9ac7c69a3a507375ef80 | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < d21be7d051012c6b572fa4e3334443c250216f7b | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < 875c284c0f98b042bb97abad460f63a24c977f88 | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < b61af0268e3d1308c466bf0be5dced844eafc1ef | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < e889aa99ad3ed48bb0ddcff6475b17542532d18b | ≥ c15b1ccadb323ea50023e8f1cca2954129a62b51, < 627ac78f2741e2ebd2225e2e953b6964a8a9182f | 835b474b8f70fa68d68abffad37378e92f661802 | ≥ 3.10.105, < 3.11 | 3.14
3 vendors · 171 products
