EUVD-2026-66236Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AC:H reflects the timing-dependent race condition and multi-audio-device prerequisite; PR:L for required local account; full C/I/A for kernel-level compromise.
Primary rating from Vendor (freebsd).
CVSS VectorVendor: freebsd
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Privilege escalation in FreeBSD's kernel audio subsystem allows an unprivileged local user on systems with multiple audio devices to exploit a use-after-free in the sync group ioctl locking path to achieve full kernel compromise. The race condition arises when the ioctl releases the sync group list lock to sleep during a blocking lock attempt, and a concurrent operation frees the sync group structure before the sleeping thread reawakens and dereferences it. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, authenticated session with a low-privilege user account (CVSS PR:L) on a FreeBSD system running one of the affected release versions. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a credible local privilege escalation with no user interaction needed and full CIA impact - characteristics of a complete kernel takeover. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the vendor-released patches: upgrade to FreeBSD 14.4-RELEASE-p9, FreeBSD 15.0-RELEASE-p13, or FreeBSD 15.1-RELEASE-p3 as appropriate, following the instructions in FreeBSD Security Advisory FreeBSD-SA-26:58.sound.asc at https://security.freebsd.org/advisories/FreeBSD-SA-26:58.sound.asc. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all FreeBSD systems running versions 14.4-RELEASE before p9, 15.0-RELEASE before p13, or 15.1-RELEASE before p3, and document which have multiple audio device configurations. …
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Same weakness CWE-416 – Use After Free
View allSame technique Privilege Escalation
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External POC / Exploit Code
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