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 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.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 6% of CVEs (scores of 2026-10-25)

CWE

CWE-908

Published

2025-10-04

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

References

• https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753
• https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71
• https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7
• https://git.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf
• https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a

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