Riskcovery

CVE-2026-68445

drm/vc4: Prevent shader BO mappings from becoming writable

State
Published
Severity
7.8 High
Published
Aug 12, 2026
Updated
Oct 30, 2026
Reserved
Jul 30, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before 4c98260a967e8536c69437b8da8eea3188cd6db8Affected
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before 9f0ee411fc2d76333d6087c5862ffa907cf7a175Affected
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7Affected
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before 6deaa317201851c644c431b57682e54d06b35838Affected
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before fe168ef1d232d734d9998fd74822e2e20930dfffAffected
  • 463873d5701427f2964a0b4b72c45f1f14b6df87 to before 0c9e6367639548307d3f578f6943ce72c9d39087Affected
LinuxLinux
  • 4.5Affected
  • before 4.5Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.148 through 6.6.*Not affected
  • 6.12.101 through 6.12.*Not affected
  • 6.18.42 through 6.18.*Not affected
  • 7.1.6 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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