CVE-2026-58091 Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl

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...

CVE-2026-58091

CVE-2026-58091 is a kernel use-after-free in FreeBSD's sound(4) driver , triggered via the SNDCTL_DSP_SYNCSTART ioctl. When locking a channel in a sync group would block, the implementation releases the sync group list lock and sleeps; upon reawakening, the sync group structure may have been free...

FreeBSD-SA-26:58.sound

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:58.sound Security Advisory The FreeBSD Project Topic: Kernel use-after-free via the SNDCTLDSPSYNCSTART ioctl Category: core Module: sound Announced:...