CVE-2026-46309
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, the DRM/XE driver added validation in xe_vm_madvise_ioctl() to reject PAT indices with XE_COH_NONE coherency mode for CPU cached memory. Using coh_none with CPU cached buffers is a security issue because the GPU can bypass CPU caches and read stale sensitive data directly from DRAM, potentially leaking data from previously freed pages of other processes.
Risk Assessment
The organization is at risk of inter-process data leakage when the GPU with coh_none mode reads stale data from DRAM that should have been cleared. This could expose sensitive data from other users or applications on the same system.
Recommendation
Immediately update the Linux kernel to a version containing commit 016ccdb674b8c899940b3944952c96a6a490d10a or later. A system reboot is required after the update.
Original NVD description (English source)
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)