CVE-2026-68274 drm/xe/guc: Fix buffer overflow in steered register list allocation
A buffer overflow in the Linux kernel's Intel Xe GPU driver allows attackers to corrupt memory, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68274?
CVE-2026-68274 is a high-severity memory corruption vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In 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)
Weakness: CWE-787
Which versions are affected by CVE-2026-68274?
How do I fix CVE-2026-68274?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68274 being exploited?
There is no known exploitation of CVE-2026-68274 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68274, DEBIAN-CVE-2026-68274, GHSA-v84f-f8j3-97q7, UBUNTU-CVE-2026-68274.