CVE-2025-39964
crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
Linux Kernel Race Condition Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA notes
This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: ; https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce; https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9; https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8; https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84; https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d; https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042; https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2025-39964
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.
Severity
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux | 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <0f28c4adbc4a97437874c9b669fd7958a8c6d6ce 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <e4c1ec11132ec466f7362a95f36a506ce4dc08c9 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <7c4491b5644e3a3708f3dbd7591be0a570135b84 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <9aee87da5572b3a14075f501752e209801160d3d 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <45bcf60fe49b37daab1acee57b27211ad1574042 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 to <1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 |
| Linux | Linux | 2.6.38 0 to <2.6.38 (unaffected) 5.10.245 to 5.10.* (unaffected) 5.15.194 to 5.15.* (unaffected) 6.1.154 to 6.1.* (unaffected) 6.6.108 to 6.6.* (unaffected) 6.12.49 to 6.12.* (unaffected) 6.16.9 to 6.16.* (unaffected) 6.17 to * (unaffected) |
References
7 Links- https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce
- https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9
- https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8
- https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84
- https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d
- https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042
- https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285
Record Details
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