CVE-2026-58091
Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
Description
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.
INFO
Published Date :
Aug. 26, 2026, 4:38 a.m.
Last Modified :
Aug. 26, 2026, 4:38 a.m.
Remotely Exploit :
No
Source :
freebsd
Affected Products
The following products are affected by CVE-2026-58091
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Acquire locks carefully to avoid race conditions.
- Ensure sync group structure is valid after waking.
- Apply relevant security patches from the vendor.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-58091 vulnerability anywhere in the article.