Race Condition Affecting kernel-rt-debug-devel package, versions <0:4.18.0-553.166.1.rt7.507.el8_10


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

Exploit Maturity
Attacked
EPSS
1% (62nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ALMALINUX8-KERNELRTDEBUGDEVEL-20075654
  • published24 Sept 2026
  • disclosed22 Sept 2026

Introduced: 22 Sep 2026

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

How to fix?

Upgrade AlmaLinux:8 kernel-rt-debug-devel to version 0:4.18.0-553.166.1.rt7.507.el8_10 or higher.
This issue was patched in ALSA-2026:70403.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-devel package and not the kernel-rt-debug-devel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 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