UBUNTU-CVE-2026-99125: Medium severity vulnerability

Remediation

Recommended actions to resolve this vulnerability, in priority order.

1. Compensating control

   Update the s390 PAI PMU handling so PMU->start() clears PERF_HES_STOPPED and PMU->stop() checks PERF_HES_STOPPED on entry, returning when it is already set to prevent back-to-back stop callbacks.

2. Compensating control

   Prohibit ioctl(fd, PERF_EVENT_IOC_PERIOD, ...) for this event.

3. Compensating control

   Use list_for_each_entry_safe() when iterating over syswide_list in pai_have_samples().

Event History