---
id: CVE-2026-64546
title: 'drm/edid: fix OOB read in drm_parse_tiled_block()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  drm/edid: fix OOB read in drm_parse_tiled_block()

  drm_parse_tiled_block() casts the DisplayID block to a
  struct displayid_tiled_block and reads the full fixed layout u…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    157727131ce8a52d8d9bc676c372ef82db6436c4
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    4f5484d25f85ad6c989bad5f6a43450cecfcfd28
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    9cc0f8e63e8c34cf43def35cbd305ba711181a1f
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb
  - >-
    Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe <
    faaa1e1155833e7d4ce7e3cfaf64c0d636b190db
  - Linux 3.19
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:42:17.796608Z'
published: '2026-07-27'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:52:51.581Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64546'
references:
  - url: 'https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0'
  - url: 'https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061'
  - url: 'https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4'
  - url: 'https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d'
  - url: 'https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28'
  - url: 'https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f'
  - url: 'https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb'
  - url: 'https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db'
tags:
  - cve.org
epss: 0.00126
epssPercentile: 0.02042
ingestedAt: '2026-10-16T17:24:46.831Z'
---

## Overview

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

drm/edid: fix OOB read in drm_parse_tiled_block()

drm_parse_tiled_block() casts the DisplayID block to a
struct displayid_tiled_block and reads the full fixed layout up to
tile->topology_id[7] without checking block->num_bytes. The DisplayID
iterator only validates the declared payload length, so a crafted EDID
can advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or
DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at
the end of a DisplayID extension. The read then runs past the end of the
exact-sized kmemdup()'d EDID allocation, a heap out-of-bounds read.

Reject blocks shorter than the spec's 22-byte tiled payload before
reading the fixed struct, as drm_parse_vesa_mso_data() already does.

  BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update
  Read of size 2 at addr ffff888010077700 by task exploit/147
   dump_stack_lvl (lib/dump_stack.c:94 ...)
   print_report (mm/kasan/report.c:378 ...)
   kasan_report (mm/kasan/report.c:595)
   drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581)
   bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574)
   drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426)
   status_store (drivers/gpu/drm/drm_sysfs.c:219)
   ...
   vfs_write (fs/read_write.c:595 fs/read_write.c:688)
   ksys_write (fs/read_write.c:740)

## Affected

- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < 9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < 157727131ce8a52d8d9bc676c372ef82db6436c4`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < 4f5484d25f85ad6c989bad5f6a43450cecfcfd28`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < 9cc0f8e63e8c34cf43def35cbd305ba711181a1f`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb`
- `Linux >= 40d9b043a89e2301e1f97ade055a73ecc28e9afe < faaa1e1155833e7d4ce7e3cfaf64c0d636b190db`
- `Linux 3.19`

## Remediation

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