CVE-2025-39976

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-10-15. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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:

futex: Use correct exit on failure from futex_hash_allocate_default()

copy_process() uses the wrong error exit path from futex_hash_allocate_default(). After exiting from futex_hash_allocate_default(), neither tasklist_lock nor siglock has been acquired. The exit label bad_fork_core_free unlocks both of these locks which is wrong.

The next exit label, bad_fork_cancel_cgroup, is the correct exit. sched_cgroup_fork() did not allocate any resources that need to freed.

Use bad_fork_cancel_cgroup on error exit from futex_hash_allocate_default().

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

October 15, 2025

Last Modified

August 5, 2026

Advisory Details (2)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

futex: Use correct exit on failure from futex_hash_allocate_default() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f1635765cd0fdbf27b04d9a50be91a01b5adda13
generic

futex: Use correct exit on failure from futex_hash_allocate_default() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4ec3c15462b9f44562f45723a92e2807746ba7d1

Vendor Advisories for CVE-2025-39976(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.16.10—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-08-05 12:55 UTCEG score recompute
  2. 2026-08-05 12:54 UTCGHSA enrichment
  3. 2026-08-04 15:09 UTCEPSS rescore
  4. 2026-08-04 10:37 UTCEPSS rescore
  5. 2026-08-03 10:35 UTCEPSS rescore
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  7. 2026-08-01 04:15 UTCEPSS rescore
  8. 2026-07-30 16:27 UTCEPSS rescore
  9. 2026-07-30 06:31 UTCEG score recompute▲ 7.80
  10. 2026-07-30 06:31 UTCGHSA enrichment
  11. 2026-07-30 06:18 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  12. 2026-07-30 01:29 UTCEPSS rescore
  13. 2026-07-28 15:35 UTCEPSS rescore
  14. 2026-07-27 09:39 UTCOSV refresh
  15. 2026-07-26 14:54 UTCEPSS rescore
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  1. 2026-07-19 02:28 UTCEPSS rescore
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  16. 2026-07-10 04:23 UTCOSV refresh
  17. 2026-07-09 19:09 UTCEPSS rescore
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  45. 2026-06-21 14:56 UTCEPSS rescore
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  47. 2026-06-21 14:31 UTCOSV refresh
  48. 2026-06-21 01:59 UTCEPSS rescore
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  50. 2026-06-19 19:25 UTCEPSS rescore
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  74. 2026-06-02 11:09 UTCOSV refresh
  75. 2026-06-01 13:51 UTCEPSS rescore

Frequently asked(5)

What is CVE-2025-39976?
CVE-2025-39976 is a high vulnerability published on October 15, 2025. In the Linux kernel, the following vulnerability has been resolved: futex: Use correct exit on failure from futexhashallocate_default() copyprocess() uses the wrong error exit path from futexhashallocatedefault(). After exiting from futexhashallocatedefault(), neither tasklistlock nor siglock has…
When was CVE-2025-39976 disclosed?
CVE-2025-39976 was first published in the National Vulnerability Database on October 15, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-39976 actively exploited?
CVE-2025-39976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.8% of all scored CVEs.
What is the CVSS score of CVE-2025-39976?
CVE-2025-39976 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2025-39976?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39976, 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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