CVE-2026-74398

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80
generic

ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb

Vendor Advisories for CVE-2026-74398(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 46× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 07:40 UTCGHSA enrichment
  2. 2026-08-21 03:17 UTCEG score recompute
  3. 2026-08-21 03:17 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 22:49 UTCGHSA enrichment
  6. 2026-08-20 18:26 UTCGHSA enrichment
  7. 2026-08-20 14:02 UTCGHSA enrichment
  8. 2026-08-20 09:38 UTCGHSA enrichment
  9. 2026-08-20 05:15 UTCGHSA enrichment
  10. 2026-08-20 00:51 UTCGHSA enrichment
  11. 2026-08-19 20:24 UTCEG score recompute
  12. 2026-08-19 20:24 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 15:56 UTCGHSA enrichment
  15. 2026-08-19 11:31 UTCGHSA enrichment
  16. 2026-08-19 07:06 UTCGHSA enrichment
  17. 2026-08-19 02:42 UTCGHSA enrichment
  18. 2026-08-18 22:14 UTCGHSA enrichment
  19. 2026-08-18 17:49 UTCEG score recompute
  20. 2026-08-18 17:49 UTCGHSA enrichment
  21. 2026-08-18 13:49 UTCEPSS rescore
  22. 2026-08-18 13:49 UTCEPSS rescore
  23. 2026-08-18 13:10 UTCGHSA enrichment
  24. 2026-08-18 08:46 UTCGHSA enrichment
  25. 2026-08-18 04:23 UTCGHSA enrichment
Show 21 more
  1. 2026-08-18 00:00 UTCGHSA enrichment
  2. 2026-08-17 19:36 UTCGHSA enrichment
  3. 2026-08-17 15:13 UTCEG score recompute
  4. 2026-08-17 15:13 UTCGHSA enrichment
  5. 2026-08-17 13:47 UTCEPSS rescore
  6. 2026-08-17 10:49 UTCEG score recompute
  7. 2026-08-17 10:49 UTCGHSA enrichment
  8. 2026-08-17 06:26 UTCEG score recompute
  9. 2026-08-17 06:26 UTCGHSA enrichment
  10. 2026-08-17 05:55 UTCEG score recompute▲ 9.80
  11. 2026-08-17 05:55 UTCGHSA enrichment
  12. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  13. 2026-08-17 05:26 UTCEG score recompute
  14. 2026-08-17 05:26 UTCGHSA enrichment
  15. 2026-08-17 05:24 UTCMITRE cvelistV5
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:15 UTCEPSS rescore
  19. 2026-08-15 06:23 UTCNVD update
  20. 2026-08-15 06:14 UTCEG score recompute
  21. 2026-08-15 06:12 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74398?
CVE-2026-74398 is a critical vulnerability published on August 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 addrconfdadfailure() transitions ifp->state from DAD to POSTDAD via addrconfdadend(), which drops ifp->lock on return. The lock is re-acquired after…
When was CVE-2026-74398 disclosed?
CVE-2026-74398 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74398 actively exploited?
CVE-2026-74398 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.9% of all scored CVEs.
What is the CVSS score of CVE-2026-74398?
CVE-2026-74398 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74398?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74398, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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