drm/xe/uapi: Reject coh_none PAT index for CPU cached memory in madvise

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Summary

CVECVE-2026-46309
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-08 17:16:49 UTC
Updated2026-06-08 17:16:49 UTC
DescriptionIn 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)

Risk And Classification

EPSS: 0.001640000 probability, percentile 0.059430000 (date 2026-06-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ada7486c5668db542a7d361268df931aca5b726a 87f9b1528e1ffc1da3615d552c9a06aba5e20b00 git Not specified
CNA Linux Linux affected ada7486c5668db542a7d361268df931aca5b726a fea04cf6f2345bc50f15b6638906c35962b89424 git Not specified
CNA Linux Linux affected ada7486c5668db542a7d361268df931aca5b726a 4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.32 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.9 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/87f9b1528e1ffc1da3615d552c9a06aba5e20b00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fea04cf6f2345bc50f15b6638906c35962b89424 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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