CVE-2026-49416
Integer overflow in vt(4) CONS_HISTORY ioctl
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.
INFO
Published Date :
June 27, 2026, 9:25 a.m.
Last Modified :
June 27, 2026, 9:25 a.m.
Remotely Exploit :
No
Source :
freebsd
Affected Products
The following products are affected by CVE-2026-49416
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply kernel updates to fix the CONS_HISTORY ioctl handler.
- Validate history size inputs.
- Ensure proper buffer allocation.
- Perform secure buffer initialization.
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CVE-2026-49416 vulnerability anywhere in the article.