NVD

CVE-2025-39931 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: 5.5 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://cert-portal.siemens.com/productcert/html/ssa-082556.html	siemens-SADP
https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753	kernel.org	Patch
https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71	kernel.org	Patch
https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7	kernel.org	Patch
https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a	kernel.org	Patch
https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f	kernel.org	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-908	Use of Uninitialized Resource	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by kernel.org 6/17/2026 5:18:51 AM

Action

Type

Old Value

New Value

Added

Affected

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["crypto/af_alg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"6241b9e2809b12da9130894cf5beddf088dc1b8a","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"2374c11189ef704a3e4863646369f1b8e6a27d71","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"24c1106504c625fabd3b7229611af617b4c27ac7","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"045ee26aa3920a47ec46d7fcb302420bf01fd753","versionType":"git","status":"affected"},{"version":"8ff590903d5fc7f5a0a988c38267a3d08e6393a2","lessThan":"9574b2330dbd2b5459b74d3b5e9619d39299fc6f","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["crypto/af_alg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.38","status":"affected"},{"version":"0","lessThan":"2.6.38","versionType":"semver","status":"unaffected"},{"version":"6.1.154","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.108","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.49","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.16.9","lessThanOrEqual":"6.16.*","versionType":"semver","status":"unaffected"},{"version":"6.17","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

Initial Analysis by NIST 1/27/2026 1:50:21 PM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE	CWE-908
Added	CPE Configuration	OR cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.7 up to (excluding) 6.12.49 cpe:2.3:o:linux:linux_kernel:6.17:rc1::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc2::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc3::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc4::::::* cpe:2.3:o:linux:linux_kernel:6.17:rc5::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.13 up to (excluding) 6.16.9 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.2 up to (excluding) 6.6.108 cpe:2.3:o:linux:linux_kernel:6.17:rc6::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 2.6.38 up to (excluding) 6.1.154
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7 Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f Types: Patch

New CVE Received from kernel.org 10/04/2025 4:15:45 AM

Action	Type	New Value
Added	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.
Added	Reference	https://git.kernel.org/stable/c/045ee26aa3920a47ec46d7fcb302420bf01fd753
Added	Reference	https://git.kernel.org/stable/c/2374c11189ef704a3e4863646369f1b8e6a27d71
Added	Reference	https://git.kernel.org/stable/c/24c1106504c625fabd3b7229611af617b4c27ac7
Added	Reference	https://git.kernel.org/stable/c/6241b9e2809b12da9130894cf5beddf088dc1b8a
Added	Reference	https://git.kernel.org/stable/c/9574b2330dbd2b5459b74d3b5e9619d39299fc6f

Quick Info

CVE Dictionary Entry:
CVE-2025-39931
NVD Published Date:
10/04/2025
NVD Last Modified:
06/17/2026
Source:
kernel.org

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2025-39931 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by siemens-SADP 6/17/2026 5:18:51 AM

CVE Modified by kernel.org 6/17/2026 5:18:51 AM

CVE Modified by siemens-SADP 5/12/2026 9:17:17 AM

Modified Analysis by NIST 3/24/2026 8:48:46 PM

Initial Analysis by NIST 1/27/2026 1:50:21 PM

New CVE Received from kernel.org 10/04/2025 4:15:45 AM

Quick Info