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CVE-2025-38079: crypto: algif_hash - fix double free in hash_accept

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-07-30
• Weakness: CWE-415

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_hash - fix double free in hash_accept If accept(2) is called on socket type algif_hash with MSG_MORE flag set and crypto_ahash_import fails, sk2 is freed. However, it is also freed in af_alg_release, leading to slab-use-after-free error.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 2.6.38 before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.185; from 5.16 before 6.1.141; from 6.2 before 6.6.93; from 6.7 before 6.12.31 — fixed in 5.10.238, 5.15.185, 5.4.294, 6.1.141, 6.12.31, 6.14.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.238, 5.15.185, 5.4.294, 6.1.141. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0346f4b742345d1c733c977f3a7aef5a6419a967
• https://git.kernel.org/stable/c/134daaba93193df9e988524b5cd2f52d15eb1993
• https://git.kernel.org/stable/c/2f45a8d64fb4ed4830a4b3273834ecd6ca504896
• https://git.kernel.org/stable/c/5bff312b59b3f2a54ff504e4f4e47272b64f3633
• https://git.kernel.org/stable/c/b2df03ed4052e97126267e8c13ad4204ea6ba9b6
• https://git.kernel.org/stable/c/bf7bba75b91539e93615f560893a599c1e1c98bf
• https://git.kernel.org/stable/c/c3059d58f79fdfb2201249c2741514e34562b547
• https://git.kernel.org/stable/c/f0f3d09f53534ea385d55ced408f2b67059b16e4
• https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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