CVE-2026-98937
Beschrijving NL
In the Linux kernel, the following vulnerability has been resolved:
perf/core: Check kernel access when kernel callchains are requested
perf_event_open() currently gates perf_allow_kernel() only on
!attr.exclude_kernel. However, users can still request kernel callchain collection with
attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1. That still requires kernel profiling privilege, but the existing check
does not enforce it. Update the permission check to call perf_allow_kernel() when either
kernel sampling is requested or kernel callchains are requested. This keeps permission checks aligned with requested data and prevents
unprivileged use of kernel callchain capture.
Origineel (Engels) tonen
In the Linux kernel, the following vulnerability has been resolved:
perf/core: Check kernel access when kernel callchains are requested
perf_event_open() currently gates perf_allow_kernel() only on
!attr.exclude_kernel.
However, users can still request kernel callchain collection with
attr.exclude_callchain_kernel == 0 even when attr.exclude_kernel == 1.
That still requires kernel profiling privilege, but the existing check
does not enforce it.
Update the permission check to call perf_allow_kernel() when either
kernel sampling is requested or kernel callchains are requested.
This keeps permission checks aligned with requested data and prevents
unprivileged use of kernel callchain capture.