CVE-2026-98310
UnknownSummary
In the Linux kernel's drm/xe/shrinker component, a bug was found where __xe_shrinker_walk() walks the SYSTEM and TT LRUs without a runtime PM reference. Shrinking a buffer object outside system memory invalidates its GPU mappings, which requires the device to be resumed — while runtime suspended this trips an assertion warning and the TLB invalidation returns -ENODEV.
Risk Assessment
This can cause kernel warnings, TLB invalidation failures, and instability of the Intel Xe GPU driver during memory reclaim while the device is runtime suspended. In production environments with Intel Xe graphics, this may lead to graphics-related errors or failures.
Recommendation
Update the Linux kernel to a version containing the fix (commit 628f92b28bf4c371c10207daf6fc4caee0c0db2e or later). Until patched, avoid operations that force memory reclaim (e.g., drop_caches) on machines with the drm/xe driver active.
Other vulnerabilities in Linux kernel drm/xe
See all- CVE-2026-97620Low risk· EPSS 9%
In the Linux kernel, the drm/xe driver's emit_render_cache_flush() did not request a flush of the LSC untyped L1 dataport cache before releasing memory for reuse. Starting with MTL, the coupling between HDC Pipeline Flush and the untyped L1 cache flush no longer holds reliably, potentially allowing stale data to leak. The fix explicitly sets PIPE_CONTROL0_UNTYPED_DATAPORT_CACHE_FLUSH on Xe2 and later platforms.
- CVE-2026-90047High
A bug in the Linux kernel's drm/xe component caused get_flat_ccs_offset() to round the end of usable VRAM upwards, exposing memory belonging to the hardware compression (flat CCS) region to the VRAM allocator as free memory. The compression hardware then overwrote data in that area without the driver's knowledge, corrupting page tables and hanging the compositor (black screen). The issue primarily affects Intel Battlemage G21 hardware.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/xe/shrinker: Take a runtime PM ref before shrinking non-system memory __xe_shrinker_walk() walks the SYSTEM and TT LRUs without a runtime PM reference. Shrinking a bo outside system memory invalidates its GPU mappings, which needs the device resumed, so while it is runtime suspended the page table zap trips an assert and the TLB invalidation returns -ENODEV: WARNING: drivers/gpu/drm/xe/xe_bo.c:770 at xe_bo_move_notify+0x1fc/0x450 [xe] xe_bo_shrink+0x20f/0x2b0 [xe] __xe_shrinker_walk+0x174/0x410 [xe] xe_shrinker_scan+0x10c/0x1e0 [xe] do_shrink_slab+0x176/0x7e0 drop_caches_sysctl_handler+0x9c/0xf0 Take a reference before walking a memory type other than XE_PL_SYSTEM and stop there if it cannot be acquired. Reuse the shrinker's existing acquire path, which resumes the device directly where reclaim allows that and otherwise queues the PM worker for a later scan. Stop the walk once the scan target is met, so a satisfied scan does not wake the device. System memory is still reclaimed while the device is suspended. Gate this on xe_device_is_l2_flush_optimized(), the same condition under which xe_bo_trigger_rebind() issues the invalidation for a non-fault-mode vm, so reclaim is unaffected elsewhere. The System CCS copy already has its own reference in xe_bo_shrink(). Only a non-fault-mode vm can reach this, since a fault-mode vm requires LR mode and that holds a runtime PM reference for the vm's lifetime. Reproduced with igt@xe_madvise@dontneed-before-exec while the GPU is runtime suspended. v2: simplify needs_rpm check. (Matt) retarget Fixes tag since the issue occurs with the non-fault-mode path added by 4e7ebff69aed. v3: handle this in xe_shrinker.c instead of xe_bo.c (Thomas) v4: stop the walk once the scan target is met. (Sashiko) v5: rebase on the freed page accounting fix. (Sashiko) v6: reuse the shrinker acquire path so runtime pm can be resumed directly instead of always queueing a worker. (Thomas) v7: replace xe_pm_runtime_put() with xe_shrinker_runtime_pm_put(). (Thomas) (cherry picked from commit 628f92b28bf4c371c10207daf6fc4caee0c0db2e)
Vulnerability data from NVD (NIST) · CISA KEV · EPSS