Vulnerability Details CVE-2026-101308
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 0.1%
CVSS Severity
CVSS v3 Score 5.5