CVE-2026-23092 iio: dac: ad3552r-hs: fix out-of-bound write in ad3552r_hs_write_data_source

High 7.8 Published 4 Feb 2026 Updated 11 May 2026

A local attacker can trigger an out-of-bounds stack write in the AD3552R-HS DAC driver, potentially leading to code execution or privilege escalation.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-23092?

CVE-2026-23092 is a high-severity memory corruption vulnerability in Linux kernel, published on 4 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

iio: dac: ad3552r-hs: fix out-of-bound write in ad3552r_hs_write_data_source

When simple_write_to_buffer() succeeds, it returns the number of bytes actually copied to the buffer. The code incorrectly uses 'count' as the index for null termination instead of the actual bytes copied. If count exceeds the buffer size, this leads to out-of-bounds write. Add a check for the count and use the return value as the index.

The bug was validated using a demo module that mirrors the original code and was tested under QEMU.

Pattern of the bug: - A fixed 64-byte stack buffer is filled using count. - If count > 64, the code still does buf[count] = '\0', causing an - out-of-bounds write on the stack.

Steps for reproduce: - Opens the device node. - Writes 128 bytes of A to it. - This overflows the 64-byte stack buffer and KASAN reports the OOB.

Found via static analysis. This is similar to the commit da9374819eb3 ("iio: backend: fix out-of-bound write")

Weakness: CWE-787

Which versions are affected by CVE-2026-23092?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-23092?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-23092 being exploited?

There is no known exploitation of CVE-2026-23092 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as BELL-CVE-2026-23092, DEBIAN-CVE-2026-23092, GHSA-qw5x-4fm9-63h4, UBUNTU-CVE-2026-23092.