CVE-2024-36975: KEYS: trusted: Do not use WARN when encode fails

Severity: medium (CVSS 5.5 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: 2024-06-18 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: KEYS: trusted: Do not use WARN when encode fails When asn1_encode_sequence() fails, WARN is not the correct solution. 1. asn1_encode_sequence() is not an internal function (located in lib/asn1_encode.c). 2. Location is known, which makes the stack trace useless. 3. Results a crash if panic_on_warn is set. It is also noteworthy that the use of WARN is undocumented, and it should be avoided unless there is a carefully considered rationale to use it. Replace WARN with pr_err, and print the return value instead, which is only useful piece of information.

Affected products

Linux kernel: from 5.13 before 5.15.160; from 5.16 before 6.1.92; from 6.2 before 6.6.32; from 6.7 before 6.8.11; from 6.9 before 6.9.2 — fixed in 5.15.160, 6.1.92, 6.6.32, 6.8.11, 6.9.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.160, 6.1.92, 6.6.32, 6.8.11. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-36975 or the next vulnerability affects your stack