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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 26 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 26 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Wed, 26 Aug 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Freebsd
Freebsd freebsd
Vendors & Products Freebsd
Freebsd freebsd

Wed, 26 Aug 2026 05:00:00 +0000

Type Values Removed Values Added
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.
Title Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl
Weaknesses CWE-416
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-08-26T15:26:08.648Z

Reserved: 2026-06-29T01:40:17.498Z

Link: CVE-2026-58091

cve-icon Vulnrichment

Updated: 2026-08-26T15:26:03.892Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-26T05:18:12.337

Modified: 2026-08-26T16:54:50.030

Link: CVE-2026-58091

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-26T18:45:10Z

Weaknesses