GHSA-HRVM-Q452-GMCQ

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32
VLAI
Details

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

drm/vmwgfx: bound DMA command body size against suffix pointer

vmw_cmd_dma() locates the DMA suffix at

(unsigned long) &cmd->body + header->size - sizeof(*suffix)

without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields.

Reject the command if the body is too small for the suffix to fit.

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

{
  "affected": [],
  "aliases": [
    "CVE-2026-74443"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:48Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: bound DMA command body size against suffix pointer\n\nvmw_cmd_dma() locates the DMA suffix at\n\n\t(unsigned long) \u0026cmd-\u003ebody + header-\u003esize - sizeof(*suffix)\n\nwithout checking that header-\u003esize is large enough to contain both\ncmd-\u003ebody and the suffix.  An undersized header makes the suffix\npointer underflow back into the previous command in the bounce\nbuffer.  The verifier later writes suffix-\u003emaximumOffset, clobbering\nverified fields of an already-relocated earlier command -- a TOCTOU\non the device-visible command stream that lets one command rewrite\nanother\u0027s GMR id, surface id, or other authenticated fields.\n\nReject the command if the body is too small for the suffix to fit.",
  "id": "GHSA-hrvm-q452-gmcq",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T15:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74443"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/036e16ada95389bdc30f41068af04c1d0872fad0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4a37080a5ac777b59306cfcdf854cc05d7604d4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb20f418933bea53375843b27b4022c1810be63b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f4f1db96bfd68b81053693ba53405b6f510ac16c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fcd1e56e7816b31a1050ccc67df722b20f6bb15d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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.