CVE-2025-68797

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

char: applicom: fix NULL pointer dereference in ac_ioctl

Discovered by Atuin - Automated Vulnerability Discovery Engine.

In ac_ioctl, the validation of IndexCard and the check for a valid

RamIO pointer are skipped when cmd is 6. However, the function

unconditionally executes readb(apbs[IndexCard].RamIO + VERS) at the

end.

If cmd is 6, IndexCard may reference a board that does not exist

(where RamIO is NULL), leading to a NULL pointer dereference.

Fix this by skipping the readb access when cmd is 6, as this

command is a global information query and does not target a specific

board context.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References