high7.8
CVE-2026-49416
The CONS_HISTORY ioctl handler did not adequately validate the requested history size.
Impact
The CONS_HISTORY 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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Freebsd | Freebsd | Versions 14.3, 14.4, 15.0 |