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CVE-2026-99125— s390/pai: Handle multiple PMU stop callback invocations

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： s390/pai：处理多次 PMU 停止回调调用修复以下场景：内核为抵御极高的采样负载，会通过以下机制对采样进行限流：随后不久，调度器可能终止该任务并将其从 CPU 上移除，此时会再次调用：这会导致被连续调用两次。为防止此类情况，在函数入口处检查标志位；若该标志已设置，则直接返回。此外，在中清除标志位。禁止针对该事件调用。该调用会将设置为正值，导致当归零时，触发回调函数。此行为不被支持，因为采样事件和仅在任务调度出（schedule ou

AI Predicted 4.9 Difficulty: Hard Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1548.001 · Setuid and Setgid

Affected Version Matrix 6

Vendor	Product	Version Range	Status
Linux	Linux	`9f66572f2889a5e72a9d7e17787e52f03b1f7bd8< cf348ec613f75b9774291e47b804fd7010835a6c`	affected
		`9f66572f2889a5e72a9d7e17787e52f03b1f7bd8< f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40`	affected
		`6.11`	affected
		`< 6.11`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

s390/pai: Handle multiple PMU stop callback invocations

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: s390/pai: Handle multiple PMU stop callback invocations Handle the following scenario: The kernel protects itself against a very high sampling load and throttles the sampling using: perf_event_throttle() --> PMU->stop() Shortly later the scheduler may terminate the task and removes it from the CPU. It again calls PMU->stop() which results in two invocations of PMU->stop() called back to back. Protect against this and check the PERF_HES_STOPPED bit on function entry. If it is already set return. Clear bit PERF_HES_STOPPED in PMU->start(). Prohibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) call for this event. It sets perf_event::event_limit to a positive value and causes perf_event_overflow() to invoke pai_stop() call back function when perf_event::event_limit hits zero. This is not supported because the sample events CRYPTO_ALL and NNPA_ALL are only taken at schedule out of a task. Use list_for_each_entry_safe() for safe iteration over syswide_list in pai_have_samples().

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	9f66572f2889a5e72a9d7e17787e52f03b1f7bd8 ~ cf348ec613f75b9774291e47b804fd7010835a6c	-
Linux	Linux	6.11	-

II. Public POCs for CVE-2026-99125

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99125

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Patches & Fixes for CVE-2026-99125 (2)

https://www.cve.org/CVERecord?id=CVE-2026-99125

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

CVE-2026-99144		sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
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-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156		scsi: st: Fix use-after-free race between st_remove() and st_open()
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-2026-99154		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

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

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux