Bug 2484472 (CVE-2025-71314)

Summary: CVE-2025-71314 kernel: drm/panthor: Recover from panthor_gpu_flush_caches() failures
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `drm/panthor` component. Buggy GPU jobs created by a User Mode Driver (UMD) can lead to a blockage in the memory subsystem. This prevents flush operations from completing, resulting in system hangs. A local attacker could exploit this to cause a Denial of Service (DoS), requiring a system reset to recover.
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Description OSIDB Bzimport 2026-06-03 18:03:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/panthor: Recover from panthor_gpu_flush_caches() failures

We have seen a few cases where the whole memory subsystem is blocked
and flush operations never complete. When that happens, we want to:

- schedule a reset, so we can recover from this situation
- in the reset path, we need to reset the pending_reqs so we can send
  new commands after the reset
- if more panthor_gpu_flush_caches() operations are queued after
  the timeout, we skip them and return -EIO directly to avoid needless
  waits (the memory block won't miraculously work again)

Note that we drop the WARN_ON()s because these hangs can be triggered
with buggy GPU jobs created by the UMD, and there's no way we can
prevent it. We do keep the error messages though.

v2:
- New patch

v3:
- Collect R-b
- Explicitly mention the fact we dropped the WARN_ON()s in the commit
  message

v4:
- No changes
Comment 1 Keith Grant 2026-06-03 19:10:55 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060332-CVE-2025-71314-818a@gregkh/T