CVE-2026-68445
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
41/100
Published: 2026-08-12
Modified: 2026-10-30
First seen: 2026-10-30
Status: active
Attack Surface
Low Complexity
No Interaction
Conf. Impact
Integ. Impact
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
High
I:
High
A:
High
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.
Affected Software (7)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < 4c98260a967e8536c69437b8da8eea3188cd6db8 |
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < 9f0ee411fc2d76333d6087c5862ffa907cf7a175 |
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7 |
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < 6deaa317201851c644c431b57682e54d06b35838 |
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < fe168ef1d232d734d9998fd74822e2e20930dfff |
| Linux | Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 < 0c9e6367639548307d3f578f6943ce72c9d39087 |
| Linux | Linux | 4.5 |