Reachable Assertion Affecting kernel-rt-modules-core package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-KERNELRTMODULESCORE-20205895
- published29 Sept 2026
- disclosed24 Sept 2026
Introduced: 24 Sep 2026
NewCVE-2026-93275 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 kernel-rt-modules-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-core package and not the kernel-rt-modules-core package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
perf/x86/intel/pt: Fix stop/start with no update
If pt_event_stop() is called without PERF_EF_UPDATE flag, then perf_aux_output_end() is not called. A subsequent call to pt_event_start() will call perf_aux_output_begin() again which violates the rule against nesting and triggers a WARNING in perf_aux_output_begin().
Originally, pt_event_stop() was never called without PERF_EF_UPDATE, because the only code paths to do so are from event overflow, and Intel PT does not do that.
However the introduction of group throttling by commit 9734e25fbf5ae ("perf: Fix the throttle logic for a group") meant that an Intel PT event could be throttled if it was part of a group. Throttling calls PMU ->stop() / ->start() callbacks without flags.
An example is when AUX area sampling is used. The following commands hit the issue:
echo 10000 > /proc/sys/kernel/perf_event_max_sample_rate
perf record -F32000 --aux-sample -e '{intel_pt//u,cycles:u}'
-- bash -c 'for i in seq 1 100000 ; do true ; done'
Use PERF_HES_UPTODATE to track whether perf_aux_output_begin() and perf_aux_output_end() are balanced. A cleared PERF_HES_UPTODATE bit indicates that an AUX output context is still open.
Amend pt_event_start() / pt_event_stop() accordingly so that begin/end stay balanced:
In non-snapshot mode, stop() always closes the buffer (the buffer may have run out of space, and that accounting is done by the update), so a following start() opens a fresh one as before.
In snapshot/overwrite mode, stop() without PERF_EF_UPDATE leaves the buffer open so that pt_event_snapshot_aux() can still copy from it, and start() then only re-enables tracing instead of calling perf_aux_output_begin() again.
Note that pt_event_del() calls pt_event_stop() with PERF_EF_UPDATE flag set (as is required by the documentation), so a final call to perf_aux_output_end() is assured.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2540349
- https://access.redhat.com/security/cve/CVE-2026-93275
- https://git.kernel.org/stable/c/2e17bf3a469a41457a3bc31b1f8fd66b6ce94a6d
- https://git.kernel.org/stable/c/304844b5545f444d523286da8228a1cbc46ffffa
- https://git.kernel.org/stable/c/9b919fb5512f256e9e0604faf960b2bb98aab454
- https://git.kernel.org/stable/c/cab5015ee3f25f789b4a368f2abfa65536576b78