drm/vc4: Prevent shader BO mappings from becoming writable
Summary
| CVE | CVE-2026-68445 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-12 00:17:44 UTC |
| Updated | 2026-08-17 06:17:53 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.001260000 probability, percentile 0.027100000 (date 2026-08-17)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 463873d5701427f2964a0b4b72c45f1f14b6df87 9f0ee411fc2d76333d6087c5862ffa907cf7a175 git | Not specified |
| CNA | Linux | Linux | affected 463873d5701427f2964a0b4b72c45f1f14b6df87 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 git | Not specified |
| CNA | Linux | Linux | affected 463873d5701427f2964a0b4b72c45f1f14b6df87 6deaa317201851c644c431b57682e54d06b35838 git | Not specified |
| CNA | Linux | Linux | affected 463873d5701427f2964a0b4b72c45f1f14b6df87 fe168ef1d232d734d9998fd74822e2e20930dfff git | Not specified |
| CNA | Linux | Linux | affected 463873d5701427f2964a0b4b72c45f1f14b6df87 0c9e6367639548307d3f578f6943ce72c9d39087 git | Not specified |
| CNA | Linux | Linux | affected 4.5 | Not specified |
| CNA | Linux | Linux | unaffected 4.5 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.148 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.101 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.42 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.6 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.