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.
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Meta Information
Published
2025-10-13
Last Modified
2026-02-26
Generated
2026-05-07
AI Q&A
2025-10-13
EPSS Evaluated
2026-05-05
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
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KEV
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CWE ID Description
CWE-UNKNOWN
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

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.


How can this vulnerability impact me? :

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.


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