CVE-2026-68445 - drm/vc4: Prevent shader BO mappings from becoming writable

CVE-2026-68445 - drm/vc4: Prevent shader BO mappings from becoming writable

https://cvefeed.io/rssfeed/latest.atom / Wed, 08/12/2026 - 04:25
CVE ID :CVE-2026-68445
Published : Aug. 12, 2026, 12:17 a.m. | 1 hour, 10 minutes ago
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.
Severity: 0.0 | NA
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