CVE-2025-39964
crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
Linux·Kernel
- Added
- Sep 18, 2026
- Fix due
- Sep 21, 2026
- Ransomware
- Not known
- Published
- Oct 13, 2025
- Updated
- Oct 15, 2026
- First covered
- Sep 21, 2026
- Latest story
- 2 months ago
Summary
In the Linux kernel, the following vulnerability has been resolved:crypto: af_alg - Disallow concurrent writes in af_alg_sendmsgIssuing 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.
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Attack profile
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCISA 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.
Affected products
- Linux8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to before 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to before e4c1ec11132ec466f7362a95f36a506ce4dc08c98ff590903d5fc7f5a0a988c38267a3d08e6393a2 to before 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c88ff590903d5fc7f5a0a988c38267a3d08e6393a2 to before 7c4491b5644e3a3708f3dbd7591be0a570135b84
- Linux2.6.38