Missing Initialization of Resource The advisory has been revoked - it doesn't affect any version of package perf (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL10-PERF-21315507
- published21 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
CVE-2026-93181 (opens in a new tab)Amendment
The Red Hat security team deemed this advisory irrelevant for RHEL:10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/uncore: Fix uncore_box ref/unref ordering
In uncore_event_cpu_online(), uncore_box_ref() was called before uncore_change_context(). uncore_box_ref() gates on box->cpu >= 0, but box->cpu is still -1 at that point because uncore_change_context() has not run yet. As a result, the box is never initialized on the first CPU to come online in a die, leaving it permanently uninitialized in the single-CPU-per-die case.
Thus, box->refcnt is one count below the true value, and in the CPU offline path, the box will be torn down on the second-to-last CPU.
In uncore_event_cpu_offline(), uncore_box_unref() was called after uncore_change_context(), so box->cpu is already -1 when the collector CPU goes offline, which prevents it from tearing down the box.
Fix by swapping the call order in both paths so that uncore_box_{ref,unref}() runs at the point where box->cpu reflects the correct context.
Move allocate_boxes() out of uncore_box_ref() to enable this reordering.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2536682
- https://access.redhat.com/security/cve/CVE-2026-93181
- https://git.kernel.org/stable/c/174f0582e38abe03b88e15f04bfe58490f88cb19
- https://git.kernel.org/stable/c/64aa1bb4017d598828c6d8cd718f43daf2a83375
- https://git.kernel.org/stable/c/3cfd351602e6704cce9bc766a974afb9f745d44b