Vulnerability-Lookup

CVE-2026-68445 (GCVE-0-2026-68445)

Vulnerability from cvelistv5 – Published: 2026-08-12 00:07 – Updated: 2026-08-12 00:07

Title

drm/vc4: Prevent shader BO mappings from becoming writable

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Prevent shader BO mappings from becoming writable vc4_gem_object_mmap() rejects a writable mapping of a validated shader BO, but leaves VM_MAYWRITE set. Userspace can map the BO read-only and then turn it writable with mprotect(). Validated shader BOs must stay read-only: the validator checks the instructions once and the GPU trusts them afterwards. A writable mapping lets userspace rewrite the code after validation, bypassing the validator. Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 already does for its read-only objects.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/9f0ee411fc2d76333…
https://git.kernel.org/stable/c/019e6ad247f7fd038…
https://git.kernel.org/stable/c/6deaa317201851c64…
https://git.kernel.org/stable/c/fe168ef1d232d734d…
https://git.kernel.org/stable/c/0c9e6367639548307…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 463873d5701427f2964a0b4b72c45f1f14b6df87 , < 9f0ee411fc2d76333d6087c5862ffa907cf7a175 (git) Affected: 463873d5701427f2964a0b4b72c45f1f14b6df87 , < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 (git) Affected: 463873d5701427f2964a0b4b72c45f1f14b6df87 , < 6deaa317201851c644c431b57682e54d06b35838 (git) Affected: 463873d5701427f2964a0b4b72c45f1f14b6df87 , < fe168ef1d232d734d9998fd74822e2e20930dfff (git) Affected: 463873d5701427f2964a0b4b72c45f1f14b6df87 , < 0c9e6367639548307d3f578f6943ce72c9d39087 (git)
Linux	Linux	Affected: 4.5 Unaffected: 0 , < 4.5 (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2-rc5 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/vc4/vc4_bo.c"
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              "version": "0",
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              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Prevent shader BO mappings from becoming writable\n\nvc4_gem_object_mmap() rejects a writable mapping of a validated shader\nBO, but leaves VM_MAYWRITE set.  Userspace can map the BO read-only and\nthen turn it writable with mprotect().\n\nValidated shader BOs must stay read-only: the validator checks the\ninstructions once and the GPU trusts them afterwards.  A writable\nmapping lets userspace rewrite the code after validation, bypassing the\nvalidator.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 already does for its read-only objects."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-12T00:07:36.230Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7"
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          "url": "https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838"
        },
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          "url": "https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087"
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      ],
      "title": "drm/vc4: Prevent shader BO mappings from becoming writable",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68445",
    "datePublished": "2026-08-12T00:07:36.230Z",
    "dateReserved": "2026-07-30T09:28:09.394Z",
    "dateUpdated": "2026-08-12T00:07:36.230Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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  }
}

GHSA-RW5P-XFF5-86QJ

Vulnerability from github – Published: 2026-08-12 00:31 – Updated: 2026-08-12 00:31

Details

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

drm/vc4: Prevent shader BO mappings from becoming writable

vc4_gem_object_mmap() rejects a writable mapping of a validated shader BO, but leaves VM_MAYWRITE set. Userspace can map the BO read-only and then turn it writable with mprotect().

Validated shader BOs must stay read-only: the validator checks the instructions once and the GPU trusts them afterwards. A writable mapping lets userspace rewrite the code after validation, bypassing the validator.

Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 already does for its read-only objects.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-68445"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T00:17:44Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Prevent shader BO mappings from becoming writable\n\nvc4_gem_object_mmap() rejects a writable mapping of a validated shader\nBO, but leaves VM_MAYWRITE set.  Userspace can map the BO read-only and\nthen turn it writable with mprotect().\n\nValidated shader BOs must stay read-only: the validator checks the\ninstructions once and the GPU trusts them afterwards.  A writable\nmapping lets userspace rewrite the code after validation, bypassing the\nvalidator.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 already does for its read-only objects.",
  "id": "GHSA-rw5p-xff5-86qj",
  "modified": "2026-08-12T00:31:13Z",
  "published": "2026-08-12T00:31:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68445"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-68445 (GCVE-0-2026-68445)

GHSA-RW5P-XFF5-86QJ

Tags

Sightings

Nomenclature