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.

CVSS v3.1 Score

3.3

LOW

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	2.6.38 — 5.10.245
linux	linux_kernel	5.11 — 5.15.194
linux	linux_kernel	5.16 — 6.1.154
linux	linux_kernel	6.2 — 6.6.108
linux	linux_kernel	6.7 — 6.12.49
linux	linux_kernel	6.13 — 6.16.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/0f28c4adbc4a97437874c9b669fd7958a8c6d6ce https://git.kernel.org/stable/c/1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 https://git.kernel.org/stable/c/1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 https://git.kernel.org/stable/c/45bcf60fe49b37daab1acee57b27211ad1574042 https://git.kernel.org/stable/c/7c4491b5644e3a3708f3dbd7591be0a570135b84 https://git.kernel.org/stable/c/9aee87da5572b3a14075f501752e209801160d3d https://git.kernel.org/stable/c/e4c1ec11132ec466f7362a95f36a506ce4dc08c9

Frequently Asked Questions

What is CVE-2025-39964? +

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. It has a CVSS v3.1 base score of 3.3 (LOW).

How severe is CVE-2025-39964? +

CVE-2025-39964 has a CVSS v3.1 score of 3.3 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-39964? +

CVE-2025-39964 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-39964? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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