CVE-2026-68445
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 versions
Linux kernel versions
4.5
and later are affected. Fixed in
6.6.148,
6.12.101,
6.18.42,
7.1.6,
7.2-rc5
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-68445?
CVE-2026-68445 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.5 onward and has been patched in 6.6.148, 6.12.101, 6.18.42 and others. CVE-2026-68445 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-68445?
Yes. CVE-2026-68445 has been patched. Fixed versions include 6.6.148, 6.12.101, 6.18.42 and others. If you are running Linux kernel 4.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-68445 actively exploited?
No. CVE-2026-68445 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.