Bug 2424895 (CVE-2025-68732)

Summary: CVE-2025-68732 kernel: Linux kernel: Denial of Service in GPU host1x due to race condition
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's GPU host1x subsystem. A local attacker could exploit a race condition during syncpoint allocation and freeing. This improper synchronization may allow syncpoints to be allocated while still being cleaned up, potentially leading to a denial of service (DoS).
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Description OSIDB Bzimport 2025-12-24 11:04:22 UTC 
In the Linux kernel, the following vulnerability has been resolved:

gpu: host1x: Fix race in syncpt alloc/free

Fix race condition between host1x_syncpt_alloc()
and host1x_syncpt_put() by using kref_put_mutex()
instead of kref_put() + manual mutex locking.

This ensures no thread can acquire the
syncpt_mutex after the refcount drops to zero
but before syncpt_release acquires it.
This prevents races where syncpoints could
be allocated while still being cleaned up
from a previous release.

Remove explicit mutex locking in syncpt_release
as kref_put_mutex() handles this atomically.
Comment 1 Vipul Nair 2025-12-24 12:06:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122406-CVE-2025-68732-d91d@gregkh/T