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

High · CVSS 7.8 (CVSS 3.1)KEV known exploitedEPSS 1.6%, 75th percentilePublished Updated Assigner: Linux

In CISA’s Known Exploited Vulnerabilities catalog: Linux Kernel Race Condition Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

Required action: 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.

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.

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

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Linux: LinuxSiemens: SIMATIC S7-1500 CPU 1518-4 PN/DP MFPSiemens: SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPSiemens: SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

References

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