CVE-2026-49416: Integer overflow in vt(4) CONS_HISTORY ioctl
The CONSHISTORY ioctl handler did not adequately validate the requested history size. A large value caused an integer overflow in the buffer size calculation, resulting in a heap allocation smaller than expected. Subsequent initialization of the buffer wrote beyond the end of the allocation.
An unprivileged local user with access to a vt(4) device can trigger an out-of-bounds write in the kernel, potentially escalating privileges.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-49416?
CVE-2026-49416 has a risk score of 54.
How do I fix CVE-2026-49416?
To fix CVE-2026-49416, ensure that your system is updated with the latest security patches from the FreeBSD repository.
What software is affected by CVE-2026-49416?
CVE-2026-49416 affects the vt(4) CONS_HISTORY ioctl.
What type of vulnerability is CVE-2026-49416?
CVE-2026-49416 is classified as an integer overflow vulnerability.
What could be the impact of exploiting CVE-2026-49416?
Exploiting CVE-2026-49416 could lead to a buffer overflow, resulting in potential arbitrary code execution or denial of service.