{"id":"CVE-2026-99125","published":"2026-10-28T11:17:32.210","lastModified":"2026-10-28T11:17:32.210","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pai: Handle multiple PMU stop callback invocations\n\nHandle the following scenario:\nThe kernel protects itself against a very high sampling load and\nthrottles the sampling using:\n\n  perf_event_throttle() --> PMU->stop()\n\nShortly later the scheduler may terminate the task and removes it from the\nCPU. It again calls\n\n  PMU->stop()\n\nwhich results in two invocations of PMU->stop() called back to back.\nProtect against this and check the PERF_HES_STOPPED bit on function\nentry.  If it is already set return.\nClear bit PERF_HES_STOPPED in PMU->start().\n\nProhibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) call for this event.\nIt sets perf_event::event_limit to a positive value and causes\nperf_event_overflow() to invoke pai_stop() call back function when\nperf_event::event_limit hits zero. This is not supported because the\nsample events CRYPTO_ALL and NNPA_ALL are only taken at schedule out\nof a task.\n\nUse list_for_each_entry_safe() for safe iteration over syswide_list\nin pai_have_samples().","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/cf348ec613f75b9774291e47b804fd7010835a6c","tags":[]},{"url":"https://git.kernel.org/stable/c/f3110e969ad226ffbb2d9b4bf5387e68d0d9ef40","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}