CVE-2026-58091: Freebsd

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would block, it releases the sync group list lock and sleeps. Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility. On a system with a multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges.

Affected products

• Freebsd Freebsd: version 14.4 only; version 15.0 only; version 15.1 only

Published 2026-08-26. Last modified 2026-09-24.