Linux Kernel Faulty Syscall Buffer Handling Allows Bypass of Access Checks
CVE-2026-99232 Published on November 2, 2026
tracing/syscalls: Use copy_from_user for the faultable syscall buffer
In the Linux kernel, the following vulnerability has been resolved:
tracing/syscalls: Use copy_from_user for the faultable syscall buffer
syscall_copy_user_array() copies the buffer argument of faultable
syscalls (write, pwrite64, ...) with __copy_from_user(), which skips
access_ok(). Use copy_from_user() instead so a non-user address is
rejected and the entry is recorded as faulted.
It could be a security concern for machines that trust perf a bit too
much.
Products Associated with CVE-2026-99232
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Affected Versions
Linux:- Version baa031b7bd2ce7502339174a42974321859ecd6a and below e33e2718c62a602001ab549642a1aed0be797105 is affected.
- Version baa031b7bd2ce7502339174a42974321859ecd6a and below 041d1a568a11a7ed7415ef1408d0c65041c1ad69 is affected.
- Version 6.19 is affected.
- Before 6.19 is unaffected.
- Version 7.2.14, <= 7.2.* is unaffected.
- Version 7.3.1, <= 7.3.* is unaffected.