crypto: af_alg - Set merge to zero early in af_alg_sendmsg

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-39931
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-10-04 08:15:45 UTC
Updated2026-07-14 13:17:51 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-908

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 db2b42425dfbde4983b0c20fb7cfa05f70e6a745 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 6241b9e2809b12da9130894cf5beddf088dc1b8a git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 2374c11189ef704a3e4863646369f1b8e6a27d71 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 24c1106504c625fabd3b7229611af617b4c27ac7 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 045ee26aa3920a47ec46d7fcb302420bf01fd753 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 9574b2330dbd2b5459b74d3b5e9619d39299fc6f git Not specified
CNA Linux Linux affected 2.6.38 Not specified
CNA Linux Linux unaffected 2.6.38 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.154 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.108 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.49 6.12.* semver Not specified
CNA Linux Linux unaffected 6.16.9 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.5 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-082556.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/db2b42425dfbde4983b0c20fb7cfa05f70e6a745 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/28f6f37abca7c5c9eb3959c66310f1d4d98b8aaf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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