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. …
Published: 2026-08-26 · CVSS: 7.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7