Is there a public exploit for CVE-2026-99125?

No public exploit for CVE-2026-99125 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

— Unscored

In the Linux kernel, the following vulnerability has been resolved: s390/pai: Handle multiple PMU stop callback invocations Handle the…

CVE-2026-99125

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: perfeventthrottle() --> 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 PERFHESSTOPPED bit on function entry. If it is already set return. Clear bit PERFHESSTOPPED in PMU->start(). Prohibit ioctl(fd, PERFEVENTIOCPERIOD, ...) call for this event. It sets perfevent::eventlimit to a positive value and causes perfeventoverflow() to invoke paistop() call back function when perfevent::eventlimit hits zero. This is not supported because the sample events CRYPTOALL and NNPAALL are only taken at schedule out of a task. Use listforeachentrysafe() for safe iteration over syswidelist in paihavesamples().

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 28 October 2026
Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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