CVE-2026-49416 – Integer overflow in vt(4) CONS_HISTORY ioctl

CVE ID :CVE-2026-49416

Published : June 27, 2026, 9:25 a.m. | 2 hours, 20 minutes ago

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.

Severity: 0.0 | NA

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