Use-after-free in FreeBSD - CVE-2026-49418
Published: July 1, 2026
Vulnerability identifier: #VU136005
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49418
CWE-ID: CWE-416
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 escalate privileges.
The vulnerability exists due to use-after-free in the device pager page list when calling msync(MS_INVALIDATE) on a mapping of an unmanaged device object and then triggering a subsequent page fault. A local user can access a device that provides memory-mapped I/O and trigger the flaw to escalate privileges.
Exploitation is limited to systems where the user can access a device that provides memory-mapped I/O.
How to mitigate CVE-2026-49418
Install security update from vendor's website.