CVE-2026-68445
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.
How to fix
- Linux Linux4c98260a967e8536c69437b8da8eea3188cd6db8, 9f0ee411fc2d76333d6087c5862ffa907cf7a175, 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7, 6deaa317201851c644c431b57682e54d06b35838, fe168ef1d232d734d9998fd74822e2e20930dfff, 0c9e6367639548307d3f578f6943ce72c9d39087 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < 4c98260a967e8536c69437b8da8eea3188cd6db8, 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < 9f0ee411fc2d76333d6087c5862ffa907cf7a175, 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7, 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < 6deaa317201851c644c431b57682e54d06b35838, 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < fe168ef1d232d734d9998fd74822e2e20930dfff, 463873d5701427f2964a0b4b72c45f1f14b6df87 ≤ v < 0c9e6367639548307d3f578f6943ce72c9d39087, 4.5 | 4c98260a967e8536c69437b8da8eea3188cd6db8, 9f0ee411fc2d76333d6087c5862ffa907cf7a175, 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7, 6deaa317201851c644c431b57682e54d06b35838, fe168ef1d232d734d9998fd74822e2e20930dfff, 0c9e6367639548307d3f578f6943ce72c9d39087 |
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