CVE-2026-99232
tracing/syscalls: Use copy_from_user for the faultable syscall buffer
What happened?
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.
Affected software and versions
| Software | Version information | Fixed version |
|---|---|---|
| LinuxLinux | affected: baa031b7bd2ce7502339174a42974321859ecd6a to < e33e2718c62a602001ab549642a1aed0be797105; affected: baa031b7bd2ce7502339174a42974321859ecd6a to < 041d1a568a11a7ed7415ef1408d0c65041c1ad69; affected: baa031b7bd2ce7502339174a42974321859ecd6a to < 097fd0050089df17b032f2b852b9b65e548e342a | See vendor advisory |
| LinuxLinux | affected: 6.19; unaffected: 0 to < 6.19; unaffected: 7.2.14 to ≤ 7.2.*; unaffected: 7.3.1 to ≤ 7.3.*; unaffected: 7.4-rc1 to ≤ * | See vendor advisory |
Version information comes from the source record and can include unaffected products and exceptions. Distribution packages may contain backported fixes: an older upstream version alone does not prove a server is affected.
Is it being exploited?
This CVE was not listed in the CISA catalogue at our last retrieval. This does not establish that exploitation is absent.
How to respond
- Confirm the product, installed package version, and any configuration requirements in the vendor advisory.
- Follow the vendor’s remediation or workaround guidance in the references below. Structured fixed-version data is unavailable here; the publisher’s description may include a fix or workaround.
- Restart affected services if required, then verify the running version. Known exploitation may warrant investigation as well as patching.