Race Condition Affecting linux-qemu-melange package, versions <6.18.17-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

Exploit Maturity
Attacked
EPSS
1.36% (72nd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-LINUXQEMUMELANGE-19923829
  • published19 Sept 2026
  • disclosed13 Oct 2025

Introduced: 13 Oct 2025

CVE-2025-39964  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Chainguard linux-qemu-melange to version 6.18.17-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-qemu-melange package and not the linux-qemu-melange package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state.

Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

CVSS Base Scores

version 3.1