CVE-2025-39931

MEDIUM EPSS 3.3%
Published Oct 4, 20258mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Oct 4, 2025 8mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
3.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-908

Affected Products 10

VendorProductVersionRange
linuxlinux_kernel*≥2.6.38  –  <6.1.154
linuxlinux_kernel*≥6.2  –  <6.6.108
linuxlinux_kernel*≥6.7  –  <6.12.49
linuxlinux_kernel*≥6.13  –  <6.16.9
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any
linuxlinux_kernel6.17any

References 6

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-082556.html
  • git.kernel.org https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f
    Patch