TOCTOU race between sound(4) buffer resizing and mmap
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.
CVE-2026-101308
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-101308
FreeBSD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "FreeBSD",
"modules": [
"sound"
],
"product": "FreeBSD",
"versions": [
{
"status": "affected",
"version": "15.1-RELEASE",
"lessThan": "p5",
"versionType": "release"
},
{
"status": "affected",
"version": "14.5-RELEASE",
"lessThan": "p2",
"versionType": "release"
},
{
"status": "affected",
"version": "14.4-RELEASE",
"lessThan": "p11",
"versionType": "release"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-101308
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #29028 · Revision 1
- Added to Heist Feed
- Publisher date