Integer overflow in FreeBSD - CVE-2026-49416
Published: June 11, 2026
Vulnerability identifier: #VU134362
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-2026-49416
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 escalate privileges.
The vulnerability exists due to integer overflow in the vt(4) CONS_HISTORY ioctl handler when resizing the scrollback history buffer of a virtual terminal. A local user can supply a large history size value to trigger an out-of-bounds write in the kernel and escalate privileges.
Exploitation requires access to a vt(4) device.
How to mitigate CVE-2026-49416
Install security update from vendor's website.