GHSA-WW5R-HF7R-8FMV

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

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

drm/virtio: bound EDID block reads to the response buffer

virtio_get_edid_block() validates the read offset only against the device-supplied resp->size field, never against the fixed-size resp->edid array. The EDID block index is driven by the device-supplied extension count, so a malicious virtio-gpu backend can advertise a large size together with a high block count and read far past the array into adjacent kernel memory, which is then surfaced in the parsed EDID (an out-of-bounds read / info leak).

Also reject any read whose end exceeds the size of the edid array. Conforming EDID responses stay within the array and are unaffected.

Severity
7.7 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-68255"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:14Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/virtio: bound EDID block reads to the response buffer\n\nvirtio_get_edid_block() validates the read offset only against the\ndevice-supplied resp-\u003esize field, never against the fixed-size resp-\u003eedid\narray. The EDID block index is driven by the device-supplied extension\ncount, so a malicious virtio-gpu backend can advertise a large size\ntogether with a high block count and read far past the array into adjacent\nkernel memory, which is then surfaced in the parsed EDID (an out-of-bounds\nread / info leak).\n\nAlso reject any read whose end exceeds the size of the edid array.\nConforming EDID responses stay within the array and are unaffected.",
  "id": "GHSA-ww5r-hf7r-8fmv",
  "modified": "2026-08-19T18:32:12Z",
  "published": "2026-08-10T15:33:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68255"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2757e6e803092cf0aeaf4b735e16b5d3bdc705c5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35be0e2c6862abcd5e5f5445261f1fd910d4a9b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/375c1934ef0196d3b6d3a1eae3232bef8dae7bf7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f506a85a905b080cadc029a1651a310479090a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fc2a017c5d597937e0c28b9a9669844aa796c42"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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.