BaseFortify

Publication date: 2026-01-13

Last updated on: 2026-01-19

Assigner: kernel.org

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.

CVSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-19

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2025-68797

Affected Vendors & Products

Vendor	Product	Version / Range
applicom	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability occurs in the Linux kernel's applicom ac_ioctl function. When the command (cmd) is 6, the function skips validation of the IndexCard and the check for a valid RamIO pointer. Despite this, it still attempts to read memory using readb(apbs[IndexCard].RamIO + VERS). If cmd is 6, IndexCard may point to a non-existent board where RamIO is NULL, causing a NULL pointer dereference. The fix involves skipping the readb access when cmd is 6 because this command is a global information query and does not require a specific board context.

Impact Analysis

This vulnerability can cause a NULL pointer dereference in the Linux kernel, which may lead to a system crash or denial of service. An attacker could potentially exploit this to disrupt system operations or cause instability.

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