GHSA-7H2W-78JH-69GR

Vulnerability from github – Published: 2026-07-27 21:31 – Updated: 2026-07-27 21:31
VLAI
Details

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)

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-64546"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-27T21:17:07Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: fix OOB read in drm_parse_tiled_block()\n\ndrm_parse_tiled_block() casts the DisplayID block to a\nstruct displayid_tiled_block and reads the full fixed layout up to\ntile-\u003etopology_id[7] without checking block-\u003enum_bytes. The DisplayID\niterator only validates the declared payload length, so a crafted EDID\ncan advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or\nDATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at\nthe end of a DisplayID extension. The read then runs past the end of the\nexact-sized kmemdup()\u0027d EDID allocation, a heap out-of-bounds read.\n\nReject blocks shorter than the spec\u0027s 22-byte tiled payload before\nreading the fixed struct, as drm_parse_vesa_mso_data() already does.\n\n  BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update\n  Read of size 2 at addr ffff888010077700 by task exploit/147\n   dump_stack_lvl (lib/dump_stack.c:94 ...)\n   print_report (mm/kasan/report.c:378 ...)\n   kasan_report (mm/kasan/report.c:595)\n   drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581)\n   bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574)\n   drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426)\n   status_store (drivers/gpu/drm/drm_sysfs.c:219)\n   ...\n   vfs_write (fs/read_write.c:595 fs/read_write.c:688)\n   ksys_write (fs/read_write.c:740)",
  "id": "GHSA-7h2w-78jh-69gr",
  "modified": "2026-07-27T21:31:26Z",
  "published": "2026-07-27T21:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64546"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.