CVE-2026-101308
Last modified
CVE-2026-101308 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer. An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking. An unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges.. EPSS estimates a 0.07% chance of exploitation in the next 30 days.
Description
When an audio channel's buffer needs to be resized, the sound(4) driver checks that the buffer is not memory-mapped and then drops the channel lock to allocate a new buffer. An mmap(2) call on another thread can complete during this window, after which the resize path frees the now-mapped buffer without rechecking. An unprivileged local user with access to a sound device can exploit this race to trigger a use-after-free in the kernel, potentially escalating privileges.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Freebsd | Freebsd | 14.4 |
| Freebsd | Freebsd | 14.5 |
| Freebsd | Freebsd | 15.1 |
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:71.sound.ascPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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