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CVE-2026-99187— perf: Fix perf_pmu_migrate_context() leaving events behind

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： perf：修复 导致事件遗留的问题 函数通过 遍历指定 CPU 和性能监控单元（PMU）的事件组组长，并在遍历过程中逐个移除它们。然而， 在将组长从事件组的红黑树（rbtree）中移除后，对该节点调用 会立即返回 ，从而过早终止遍历过程，导致其他事件组仍残留在源上下文中。 在 CPU 热插拔（hotplug）场景下，这些遗留的事件组会随着即将退出的 CPU 被销毁。在销毁之前，它们会继续运行，而此时该 PMU 的中断和已迁移的事件已位于新的 CPU 上。这种情况违背了驱

AI Predicted 5.5 Difficulty: Hard EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux bd27568117664b8b3e259721393df420ed51f57b< 3eb08f09bfb364051f51316da873c3bd51a839ef affected
bd27568117664b8b3e259721393df420ed51f57b< f5f0028764de322a3d04eda0d3b6389ca9847446 affected
bd27568117664b8b3e259721393df420ed51f57b< e76b36b4be7160eaa14b416681e548b125702395 affected
6.2 affected
< 6.2 unaffected
6.18.59≤ 6.18.* unaffected
7.2.13≤ 7.2.* unaffected
7.3≤ * unaffected
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I. Basic Information for CVE-2026-99187

Vulnerability Information
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Vulnerability Title
perf: Fix perf_pmu_migrate_context() leaving events behind
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux bd27568117664b8b3e259721393df420ed51f57b ~ 3eb08f09bfb364051f51316da873c3bd51a839ef -
Linux Linux 6.2 -

II. Public POCs for CVE-2026-99187

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III. Intelligence Information for CVE-2026-99187

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Patches & Fixes for CVE-2026-99187 (2)

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99143 tracing: Keep the predicate limit separate from program capacity
CVE-2026-99129 selinux: fix BPF token permission checks
CVE-2026-99130 io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131 xfs: fix capability check in xfs
CVE-2026-99133 net/iucv: fix the recvmsg window update
CVE-2026-99132 xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134 mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135 dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137 cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136 dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140 tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139 tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141 tracing: Fix crash in print_graph_function_event()
CVE-2026-99142 tracing: Check operator stack capacity before pushing
CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151 drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions
CVE-2026-99153 scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152 scsi: libiscsi: Validate the task named by a management response
CVE-2026-99150 drm/amdgpu: don't drop the runtime PM reference twice in amdgpu_gpr

Showing top 20 of 117 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux