CVE-2024-41081: ila: block BH in ila_output()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-29 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: ila: block BH in ila_output() As explained in commit 1378817486d6 ("tipc: block BH before using dst_cache"), net/core/dst_cache.c helpers need to be called with BH disabled. ila_output() is called from lwtunnel_output() possibly from process context, and under rcu_read_lock(). We might be interrupted by a softirq, re-enter ila_output() and corrupt dst_cache data structures. Fix the race by using local_bh_disable().

Affected products

Linux kernel: from 4.10 before 4.19.319; from 4.20 before 5.4.281; from 5.5 before 5.10.223; from 5.11 before 5.15.164; from 5.16 before 6.1.101; from 6.2 before 6.6.42 — fixed in 4.19.319, 5.10.223, 5.15.164, 5.4.281, 6.1.101, 6.6.42

How to fix

Upgrade to a fixed version: Linux kernel 4.19.319, 5.10.223, 5.15.164, 5.4.281. Check the vendor advisory for mitigations.

References

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