What’s Vulnerable › Vulnerabilities
CVE-2026-58091: Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-26 · updated 2026-09-24
- Weakness: CWE-416
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.
Affected products
- FreeBSD: 14.4-p1, 14.4-p2, 14.4-p3, 14.4-p4, 14.4-p5, 14.4-p6 (+16)
References
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