CVE-2024-50187: drm/vc4: Stop the active perfmon before being destroyed

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: 2024-11-08 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Stop the active perfmon before being destroyed Upon closing the file descriptor, the active performance monitor is not stopped. Although all perfmons are destroyed in `vc4_perfmon_close_file()`, the active performance monitor's pointer (`vc4->active_perfmon`) is still retained. If we open a new file descriptor and submit a few jobs with performance monitors, the driver will attempt to stop the active performance monitor using the stale pointer in `vc4->active_perfmon`. However, this pointer is no longer valid because the previous process has already terminated, and all performance monitors associated with it have been destroyed and freed. To fix this, when the active performance monitor belongs to a given process, explicitly stop it before destroying and freeing it.

Affected products

Linux kernel: from 4.17 before 6.1.113; from 6.2 before 6.6.57; from 6.7 before 6.11.4; 6.12-rc1, 6.12-rc2 — fixed in 6.1.113, 6.11.4, 6.6.57

How to fix

Upgrade to a fixed version: Linux kernel 6.1.113, 6.11.4, 6.6.57. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-50187 or the next vulnerability affects your stack