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CVE-2025-39964crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

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.

7.8 HIGHEPSS 1.60%⚡ Known Exploited (CISA KEV)NVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
7.8HIGH3.1Linux (CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5MEDIUM3.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA required action

⚡ Known exploited · remediation due Sep 21, 2026

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Details

CVE ID
CVE-2025-39964
Status
Analyzed
Assigner (CNA)
Linux
Published
Oct 13, 2025
Last modified
2026-10-19 21:10 UTC
Weaknesses

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:11 UTC.