CVE-2025-39931

Published Oct 4, 2025

Last updated a month ago

CVSS medium 5.5

Overview

Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to abort, ctx->merge may contain a garbage value from the previous loop. This may then trigger a crash on the next entry into af_alg_sendmsg when it attempts to do a merge that can't be done. Fix this by setting ctx->merge to zero near the start of the loop.
Source
416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD status
Analyzed
Products
linux_kernel

Risk scores

CVSS 3.1

Type
Primary
Base score
5.5
Impact score
3.6
Exploitability score
1.8
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity
MEDIUM

Weaknesses

nvd@nist.gov
CWE-908

Social media

Hype score
Not currently trending

  1. CVE-2025-39931 Linux Kernel Crypto AF_ALG Vulnerability https://t.co/F5V1APjiyY Don't wait vulnerability scanning results: https://t.co/oh1APvMMnd

    @VulmonFeeds

    4 Oct 2025

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  2. CVE-2025-39931 In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Set merge to zero early in af_alg_sendmsg If an error causes af_alg_sendmsg to … https://t.co/nPOQv1XIMY

    @CVEnew

    4 Oct 2025

    482 Impressions

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Configurations

Related CVEs

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References

Sources include official advisories and independent security research.