CVSS 5.5 (medium) ยท published 2026-10-15
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.
Affected products (NVD): freebsd freebsd
Weakness: CWE-367
Source: NVD CVE-2026-101308
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