CVE-2026-68445High· 7.8▾ TwilightIn 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. User…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 4c98260a967e8536c69437b8da8eea3188cd6db8Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 9f0ee411fc2d76333d6087c5862ffa907cf7a175Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 6deaa317201851c644c431b57682e54d06b35838Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < fe168ef1d232d734d9998fd74822e2e20930dfffLinux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 0c9e6367639548307d3f578f6943ce72c9d39087Linux 4.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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