CVE-2023-3108: Kernel: a race condition in crypto module in the function skcipher_recvmsg

Severity: medium (CVSS 4.7 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: 2023-07-11 · updated 2026-06-17
Weakness: CWE-362

Description

A flaw was found in the subsequent get_user_pages_fast in the Linux kernel’s interface for symmetric key cipher algorithms in the skcipher_recvmsg of crypto/algif_skcipher.c function. This flaw allows a local user to crash the system.

Affected products

Linux kernel: before 4.0 — fixed in 4.0

How to fix

Upgrade to a fixed version: Linux kernel 4.0. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2023-3108
https://bugzilla.redhat.com/show_bug.cgi?id=2221472
https://github.com/torvalds/linux/commit/9399f0c51489ae8c16d6559b82a452fdc1895e91
https://access.redhat.com/security/cve/CVE-2023-3108
https://bugzilla.redhat.com/show_bug.cgi?id=2221472
https://github.com/torvalds/linux/commit/9399f0c51489ae8c16d6559b82a452fdc1895e91

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