CVE-2025-39964
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-13

Last updated on: 2026-02-26

Assigner: kernel.org

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.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2025-10-13
Last Modified
2026-02-26
Generated
2026-06-16
AI Q&A
2025-10-13
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39964
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.17
linux linux_kernel From 5.15.160 (inc) to 5.16 (inc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability in the Linux kernel's crypto subsystem (af_alg) involves the ability to issue concurrent writes to the same af_alg socket. Such concurrent writes are problematic because the data can become interleaved unpredictably, leading to inconsistencies in the internal socket state. The fix disallows concurrent writes by introducing a mechanism to ensure exclusive ownership for writing.

Impact Analysis

The vulnerability can cause data corruption or unpredictable behavior in applications using the af_alg socket interface for cryptographic operations, due to interleaved data and inconsistent socket state. This may lead to failures or security issues in software relying on these cryptographic functions.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2025-39964. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart