CVE-2025-39964

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

13/10/2025

Last modified:

03/02/2026

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS v3.1 Severity and Metrics:

Base Score: 3.30 LOW
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): Low

Base Score 3.x

3.30

Severity 3.x

LOW

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	2.6.38 (including)	5.10.245 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.15.194 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.16 (including)	6.1.154 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.2 (including)	6.6.108 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.7 (including)	6.12.49 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.13 (including)	6.16.9 (excluding)
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:6.17:rc6::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2025-39964

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools