PT-2026-47380 · Linux · Linux

Published

2026-06-08

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Updated

2026-06-08

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CVE-2026-46309

None

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In the Linux kernel, the following vulnerability has been resolved:
drm/xe/uapi: Reject coh none PAT index for CPU cached memory in madvise
Add validation in xe vm madvise ioctl() to reject PAT indices with XE COH NONE coherency mode when applied to CPU cached memory.
Using coh none with CPU cached buffers is a security issue. When the kernel clears pages before reallocation, the clear operation stays in CPU cache (dirty). GPU with coh none can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes.
This aligns with the existing validation in vm bind path (xe vm bind ioctl validate bo).
v2(Matthew brost)
  • Add fixes
  • Move one debug print to better place
v3(Matthew Auld)
  • Should be drm/xe/uapi
  • More Cc
v4(Shuicheng Lin)
  • Fix kmem leak issues by the way
v5
  • Remove kmem leak because it has been merged by another patch
v6
  • Remove the fix which is not related to current fix
v7
  • No change
v8
  • Rebase
v9
  • Limit the restrictions to iGPU
v10
  • No change
(cherry picked from commit 016ccdb674b8c899940b3944952c96a6a490d10a)

Related Identifiers

CVE-2026-46309

Affected Products

Linux