Integer overflow in FreeBSD - CVE-2026-45258
Published: June 11, 2026
Vulnerability identifier: #VU134367
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45258
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to read and write kernel memory.
The vulnerability exists due to an integer overflow in dsp_mmap_single() when validating a user-supplied mmap offset and length. A local user can supply a large offset and length to obtain a mapping beyond the audio buffer and read and write kernel memory.
On systems with an audio device, the /dev/dsp device nodes are world-accessible by default.
How to mitigate CVE-2026-45258
Install security update from vendor's website.