CVE-2026-23076
Unknown Unknown - Not Provided
Out-of-Bounds Access in Linux ALSA ctxfi Audio Mixer

Publication date: 2026-02-04

Last updated on: 2026-03-18

Assigner: kernel.org

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.
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Meta Information
Published
2026-02-04
Last Modified
2026-03-18
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-14
NVD
CVE-2026-23076
Affected Vendors & Products
Showing 12 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.11 (inc) to 5.15.199 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.162 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.122 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.68 (exc)
linux linux_kernel From 6.13 (inc) to 6.18.8 (exc)
linux linux_kernel 6.19
linux linux_kernel From 2.6.31 (inc) to 5.10.249 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.
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Executive Summary

This vulnerability exists in the Linux kernel's ALSA ctxfi driver, specifically in the audio mixer handling code. The issue is caused by an out-of-bounds (OOB) access due to improper use of the 'conf' field as a loop index in certain index callback functions (amixer_index() and sum_index()).

The root cause is the lack of proper (re-)initialization of the 'conj' field, which leads to accessing an array index beyond its valid range, as detected by fuzzers and UBSAN tools.

The vulnerability was fixed by adding proper initialization of the loop indices to prevent out-of-bounds access.

Impact Analysis

This vulnerability can cause out-of-bounds memory access in the audio mixer handling code of the Linux kernel's ctxfi driver.

Such out-of-bounds access may lead to undefined behavior including potential crashes or memory corruption, which could affect system stability or security.

Compliance Impact

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