Bug 2419894 (CVE-2025-40276)

Summary: CVE-2025-40276 kernel: drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-08 07:06:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/panthor: Flush shmem writes before mapping buffers CPU-uncached

The shmem layer zeroes out the new pages using cached mappings, and if
we don't CPU-flush we might leave dirty cachelines behind, leading to
potential data leaks and/or asynchronous buffer corruption when dirty
cachelines are evicted.
Comment 1 Jon Moroney 2025-12-08 22:06:57 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120717-CVE-2025-40276-6558@gregkh/T