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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated Nov 3, 2025

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

CVE-2024-40976

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 condition entirely by masking the irqs at the beginning of the timeout handler, at which point we give up on waiting for that job entirely. The irqs will be enabled again at the next hard reset which is already done as a recovery by the timeout handler.

Affected products

98

Patches

6
bdbc4ca77f5e
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9fd8ddd23793
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
70aa1f2dec46
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
03e7b2f7ae4c
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
a421cc7a6a00
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
58bfd311c93d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

6

News mentions

0

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