Description
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
- FreeBSD / FreeBSD15.0-RELEASE – p10
- FreeBSD / FreeBSD14.4-RELEASE – p6
- FreeBSD / FreeBSD14.3-RELEASE – p15