---
id: CVE-2023-53112
title: 'drm/i915/sseu: fix max_subslices array-index-out-of-bounds access'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/i915/sseu: fix max_subslices array-index-out-of-bounds access

  It seems that commit bc3c5e0809ae ("drm/i915/sseu: Don't try to store EU
  mask internally in UAPI form…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef <
    1a1682abf7399318ac074b1f2ac6a8c992b5b3da
  - >-
    Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef <
    36b076ab6247cf0d2135b2ad6bb337617c3b5a1b
  - >-
    Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef <
    193c41926d152761764894f46e23b53c00186a82
  - Linux 6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:17:34.530575Z'
published: '2025-05-02'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:21:01.845Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53112'
references:
  - url: 'https://git.kernel.org/stable/c/1a1682abf7399318ac074b1f2ac6a8c992b5b3da'
  - url: 'https://git.kernel.org/stable/c/36b076ab6247cf0d2135b2ad6bb337617c3b5a1b'
  - url: 'https://git.kernel.org/stable/c/193c41926d152761764894f46e23b53c00186a82'
tags:
  - cve.org
epss: 0.00204
epssPercentile: 0.10479
ingestedAt: '2026-11-05T22:38:31.771Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/i915/sseu: fix max_subslices array-index-out-of-bounds access

It seems that commit bc3c5e0809ae ("drm/i915/sseu: Don't try to store EU
mask internally in UAPI format") exposed a potential out-of-bounds
access, reported by UBSAN as following on a laptop with a gen 11 i915
card:

  UBSAN: array-index-out-of-bounds in drivers/gpu/drm/i915/gt/intel_sseu.c:65:27
  index 6 is out of range for type 'u16 [6]'
  CPU: 2 PID: 165 Comm: systemd-udevd Not tainted 6.2.0-9-generic #9-Ubuntu
  Hardware name: Dell Inc. XPS 13 9300/077Y9N, BIOS 1.11.0 03/22/2022
  Call Trace:
   <TASK>
   show_stack+0x4e/0x61
   dump_stack_lvl+0x4a/0x6f
   dump_stack+0x10/0x18
   ubsan_epilogue+0x9/0x3a
   __ubsan_handle_out_of_bounds.cold+0x42/0x47
   gen11_compute_sseu_info+0x121/0x130 [i915]
   intel_sseu_info_init+0x15d/0x2b0 [i915]
   intel_gt_init_mmio+0x23/0x40 [i915]
   i915_driver_mmio_probe+0x129/0x400 [i915]
   ? intel_gt_probe_all+0x91/0x2e0 [i915]
   i915_driver_probe+0xe1/0x3f0 [i915]
   ? drm_privacy_screen_get+0x16d/0x190 [drm]
   ? acpi_dev_found+0x64/0x80
   i915_pci_probe+0xac/0x1b0 [i915]
   ...

According to the definition of sseu_dev_info, eu_mask->hsw is limited to
a maximum of GEN_MAX_SS_PER_HSW_SLICE (6) sub-slices, but
gen11_sseu_info_init() can potentially set 8 sub-slices, in the
!IS_JSL_EHL(gt->i915) case.

Fix this by reserving up to 8 slots for max_subslices in the eu_mask
struct.

(cherry picked from commit 3cba09a6ac86ea1d456909626eb2685596c07822)

## Affected

- `Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef < 1a1682abf7399318ac074b1f2ac6a8c992b5b3da`
- `Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef < 36b076ab6247cf0d2135b2ad6bb337617c3b5a1b`
- `Linux >= bc3c5e0809ae9faa039baf75547e8ee46ec124ef < 193c41926d152761764894f46e23b53c00186a82`
- `Linux 6.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.