CVE-2026-97960
CVE CVE-2026-97960EUVD EUVD-2026-86814Published 2026-09-25T10:23:04.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: perf/x86/intel: Prevent drain_pebs() reentry The PEBS buffer is shared by all events on a CPU, so drain_pebs() must not be reentered. If so, one instance may observe stale buffer state and potentially access out-of-bound memory. Most invocations happen in NMI context, which naturally prevents reentry. However, drain_pebs() is also reachable from process context via intel_pmu_drain_pebs_buffer(). In those paths, the PMU is often already disabled, but not guaranteed. For example, __intel_pmu_pebs_disable() only disables the target counter, so other active counters can still raise a PMI and interrupt an in-flight drain_pebs(). Here is an example, __perf_addr_filters_adjust() perf_event_stop() __perf_event_stop() x86_pmu_stop() (event->pmu->stop) intel_pmu_disable_event() intel_pmu_pebs_disable() __intel_pmu_pebs_disable() intel_pmu_drain_large_pebs() intel_pmu_drain_pebs_buffer() Introduce __intel_pmu_quiesce() and __intel_pmu_resume() helpers and use them in intel_pmu_drain_large_pebs() to disable the full PMU around the intel_pmu_drain_pebs_buffer() call, preventing reentry. Also add a warning in intel_pmu_drain_pebs_buffer() when the full PMU is not disabled.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 <a56c03a397e2cd0c4cf8da96dcd6214f7d0e7d8c; 6.3.7 <6.4; a9165207b2b07415eeb01b3ac8bb84976ec96984; patch: 6.18.53; patch: 7.3-rc3; b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 <c55599c0ec2aa020e41a0599c3044c56d8a2e7d9; 6.4; b752ea0c28e3f7f0aaaad6abf84f735eebc37a60 <a5fe19dd8b3ed5fad6e5e0f0c58c7245043ee4af; patch: 0; patch: 7.2.7
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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