CVE-2024-40976

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

drm/lima: mask irqs in timeout path before hard reset

There is a race condition in which a rendering job might take just long

enough to trigger the drm sched job timeout handler but also still

complete before the hard reset is done by the timeout handler.

This runs into race conditions not expected by the timeout handler.

In some very specific cases it currently may result in a refcount

imbalance on lima_pm_idle, with a stack dump such as:

[10136.669170] WARNING: CPU: 0 PID: 0 at drivers/gpu/drm/lima/lima_devfreq.c:205 lima_devfreq_record_idle+0xa0/0xb0

...

[10136.669459] pc : lima_devfreq_record_idle+0xa0/0xb0

...

[10136.669628] Call trace:

[10136.669634] lima_devfreq_record_idle+0xa0/0xb0

[10136.669646] lima_sched_pipe_task_done+0x5c/0xb0

[10136.669656] lima_gp_irq_handler+0xa8/0x120

[10136.669666] __handle_irq_event_percpu+0x48/0x160

[10136.669679] handle_irq_event+0x4c/0xc0

We can prevent that race conditi

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References