# CVE-2026-68274: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/xe/guc: Fix buffer overflow in steered regis...

CVE-2026-68274 is fixed in linux on 1 platform by DEBIAN-CVE-2026-68274 (version 7.1.6-1), released August 11, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-68274
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 10, 2026

## 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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.6-1 | [DEBIAN-CVE-2026-68274](https://patchblox.com/security/data/fix/linux/debian-cve-2026-68274.md) | Aug 11, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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