CVE-2026-99187 (GCVE-0-2026-99187)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-30 12:42
VLAI
Title
perf: Fix perf_pmu_migrate_context() leaving events behind
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Fix perf_pmu_migrate_context() leaving events behind __perf_pmu_remove() walks the group leaders of a CPU and PMU with perf_event_groups_for_cpu_pmu(), removing each one as it goes. perf_remove_from_context() takes the leader out of the groups rbtree, after which rb_next() on that node returns NULL, prematurely ending the walk. Other groups stay behind in the source context. On CPU hotplug, they are then torn down with the dying CPU. They keep running until teardown, while the PMU's interrupt and migrated events are on a new CPU, which drivers rely on never happening. Walk ctx->event_list instead and pick out the PMU's events by their pmu_ctx.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd27568117664b8b3e259721393df420ed51f57b , < 3caf006eb731e88cbb33fb5b7d1f2fdb23712bc7 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < d4002e954c612dfc7e3fb5549e4a188ea281fe35 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 3eb08f09bfb364051f51316da873c3bd51a839ef (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < f5f0028764de322a3d04eda0d3b6389ca9847446 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < e76b36b4be7160eaa14b416681e548b125702395 (git)
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Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix perf_pmu_migrate_context() leaving events behind\n\n__perf_pmu_remove() walks the group leaders of a CPU and PMU with\nperf_event_groups_for_cpu_pmu(), removing each one as it goes.\nperf_remove_from_context() takes the leader out of the groups rbtree,\nafter which rb_next() on that node returns NULL, prematurely ending the\nwalk. Other groups stay behind in the source context.\n\nOn CPU hotplug, they are then torn down with the dying CPU. They keep\nrunning until teardown, while the PMU\u0027s interrupt and migrated events\nare on a new CPU, which drivers rely on never happening.\n\nWalk ctx-\u003eevent_list instead and pick out the PMU\u0027s events by their\npmu_ctx."
        }
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    "dateReserved": "2026-09-25T10:25:14.400Z",
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}



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