Bug 2429103 (CVE-2025-68797)

Summary: CVE-2025-68797 kernel: char: applicom: fix NULL pointer dereference in ac_ioctl
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2026-01-13 16:06:56 UTC 
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.
Comment 1 Jon Moroney 2026-01-14 23:13:55 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026011306-CVE-2025-68797-b45e@gregkh/T