drm/xe/guc: Fix buffer overflow in steered register list allocation

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Summary

CVECVE-2026-68274
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:16 UTC
Updated2026-08-10 13:20:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/xe/guc: Fix buffer overflow in steered register list allocation The size calculation for the steered register extarray uses only the geometry DSS mask (g_dss_mask) to determine the number of entries to allocate: total = bitmap_weight(gt->fuse_topo.g_dss_mask, ...) * steer_reg_num; However, the filling loop uses for_each_dss_steering(), which iterates over for_each_dss(), defined as the union of g_dss_mask and c_dss_mask (geometry + compute DSS). On platforms with compute-only DSS bits, the loop writes past the allocated buffer, corrupting adjacent slab objects. This manifests as list_del corruption and SLUB redzone overwrites during drm_managed_release on device unbind, since the overflow corrupts the drmres list_head of neighboring allocations. Fix by computing the allocation size using the union of both DSS masks, matching the iteration pattern of for_each_dss_steering(). -- v2: - use bitmap_weighted_or() (Zhanjun) (cherry picked from commit 0a78a44f4901aa6c9263e66be7fce02282f1109f)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b170d696c1e2226713471d810c63b1162335079f b485bfb45555163bfa5f565d6a3415fcb3035b02 git Not specified
CNA Linux Linux affected b170d696c1e2226713471d810c63b1162335079f a9a020f3c11eba6573b699f9cf9245a51b025ade git Not specified
CNA Linux Linux affected b170d696c1e2226713471d810c63b1162335079f 632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/632ecc90e1ca5d3b6822bb4d08f84a175b6c42c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9a020f3c11eba6573b699f9cf9245a51b025ade 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b485bfb45555163bfa5f565d6a3415fcb3035b02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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