CVE-2025-39931

HIGH

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 v3.1 Score

7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 10/4/2025Modified: 7/30/2026

Related Intelligence (1)

CRITICALAi

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-209-04.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommend

CVE-2021-41617CVE-2023-28531
CISA Advisories

References (9)

https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753Patchhttps://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71Patchhttps://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7Patchhttps://git.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aafhttps://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8aPatchhttps://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6fPatchhttps://git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html