CVE-2025-38003: can: bcm: add missing rcu read protection for procfs content

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-06-08 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: can: bcm: add missing rcu read protection for procfs content When the procfs content is generated for a bcm_op which is in the process to be removed the procfs output might show unreliable data (UAF). As the removal of bcm_op's is already implemented with rcu handling this patch adds the missing rcu_read_lock() and makes sure the list entries are properly removed under rcu protection.

Affected products

Debian Linux: 11.0
Linux kernel: from 4.19.252 before 4.20; from 5.4.205 before 5.4.294; from 5.10.130 before 5.10.238; from 5.15.54 before 5.15.185; from 5.18.11 before 5.19; from 5.19.1 before 6.1.141 — fixed in 4.20, 5.10.238, 5.15.185, 5.19, 5.4.294, 6.1.141

How to fix

Upgrade to a fixed version: Linux kernel 4.20, 5.10.238, 5.15.185, 5.19. Check the vendor advisory for mitigations.

References

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