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CVE-2025-39931VulnerabilityPublished Updated

Vulnerability

Source GCVE Database

0

Not known to be exploited · CVSS 5.5 Medium.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Oct 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

What to do

AI-suggested

Since this is a kernel-level issue, applying official Linux kernel updates that include the fix is recommended once available. Until then, avoid triggering conditions that cause af_alg_sendmsg to abort if possible.

Description

A vulnerability in the Linux kernel's crypto subsystem (af_alg) could cause a crash due to improper handling of the ctx->merge variable when af_alg_sendmsg aborts. The issue arises because ctx->merge may retain a garbage value from a previous loop iteration, leading to a crash on subsequent calls. The fix involves setting ctx->merge to zero early in the processing loop to prevent this condition.

References

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