CVE-2026-68445drm/vc4: Prevent shader BO mappings from becoming writable
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 463873d5701427f2964a0b4b72c45f1f14b6df87 builds before 9f0ee411fc2d76333d6087c5862ffa907cf7a175; 463873d5701427f2964a0b4b72c45f1f14b6df87 builds before 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7; 463873d5701427f2964a0b4b72c45f1f14b6df87 builds before 6deaa317201851c644c431b57682e54d06b35838; from 463873d5701427f2964a0b4b72c45f1f14b6df87 before fe168ef1d232d734d9998fd74822e2e20930dfff; 463873d5701427f2964a0b4b72c45f1f14b6df87 builds before 0c9e6367639548307d3f578f6943ce72c9d39087 | CNA record |
References
- https://git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175
- https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7
- https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838
- https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff
- https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.