CVE-2026-23076: ALSA: ctxfi: Fix potential OOB access in audio mixer handling
In the Linux kernel, the following vulnerability has been resolved:
ALSA: ctxfi: Fix potential OOB access in audio mixer handling
In the audio mixer handling code of ctxfi driver, the conf field is used as a kind of loop index, and it's referred in the index callbacks (amixerindex() and sumindex()).
As spotted recently by fuzzers, the current code causes OOB access at those functions. | UBSAN: array-index-out-of-bounds in /build/reproducible-path/linux-6.17.8/sound/pci/ctxfi/ctamixer.c:347:48 | index 8 is out of range for type 'unsigned char [8]'
After the analysis, the cause was found to be the lack of the proper (re-)initialization of conj field.
This patch addresses those OOB accesses by adding the proper initializations of the loop indices.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23076?
CVE-2026-23076 has been assessed as having a high severity due to the potential for out-of-bounds access.
How do I fix CVE-2026-23076?
To fix CVE-2026-23076, you should update your Linux kernel to the latest version where this vulnerability has been patched.
What systems are affected by CVE-2026-23076?
CVE-2026-23076 affects the ALSA ctxfi audio mixer handling in specific Linux kernel versions.
What are the potential consequences of CVE-2026-23076?
The potential consequences of CVE-2026-23076 include denial of service or arbitrary code execution due to out-of-bounds memory access.
Is there a workaround for CVE-2026-23076?
Currently, the best approach for CVE-2026-23076 is to apply the kernel patch, as there are no recommended workarounds.