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is no longer valid because the previous process has already terminated,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.

Classification

CVE ID: CVE-2024-50187

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.03% (probability of being exploited)

EPSS Percentile: 5.3% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2024-50187
https://git.kernel.org/stable/c/75452da51e2403e14be007df80d133e1443fc967
https://git.kernel.org/stable/c/937943c042503dc6087438bf3557f9057a588ba0
https://git.kernel.org/stable/c/c9adba739d5f7cdc47a7754df4a17b47b1ecf513
https://git.kernel.org/stable/c/0b2ad4f6f2bec74a5287d96cb2325a5e11706f22

Timeline