CVE-2026-58091
Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-416 |
| Vendor | freebsd |
| Product | freebsd |
| Published | Aug 26, 2026 |
| Last Updated | Aug 26, 2026 |
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Affected Versions
FreeBSD / FreeBSD
15.1-RELEASE < p3 15.0-RELEASE < p13 14.4-RELEASE < p9
References
Credits
Hazley Samsudin of GovTech CSG