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CVE Record

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 (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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2026-23076 is a Linux kernel bug in the ALSA ctxfi audio driver. A missing reinitialization can let mixer handling read or write outside an 8-byte array. The public record does not provide CVSS, confirmed impact, or active exploitation evidence.

Executive priority

Treat as a targeted kernel maintenance item, not an emergency, unless your environment uses ctxfi audio hardware or exposes local audio access on shared Linux systems.

Technical view

The ctxfi driver uses a conf field as a loop index in amixer_index() and sum_index(). Fuzzing found UBSAN array-index-out-of-bounds in sound/pci/ctxfi/ctamixer.c. The kernel fix initializes the relevant loop indices to prevent out-of-bounds access.

Likely exposure

Exposure appears limited to Linux systems with affected kernel code where the ALSA ctxfi driver and audio mixer paths are present or reachable. Confirm kernel versions, distribution backports, and whether ctxfi is built or loaded.

Exploitation context

The source states fuzzers discovered the issue. The bundle marks KEV as false, and no supplied source claims active exploitation, public exploit code, remote reachability, or privilege-escalation impact.

Researcher notes

The record lacks CVSS, CWE, exploitability detail, and impact beyond potential OOB access. Analysis should focus on driver reachability, local attack surface, kernel config, and whether vendor packages include the stable commits.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable fixes.
  • If patching is delayed, review whether ctxfi is needed on affected systems.
  • Follow Linux distribution advisories for backported fixed kernel package versions.
  • Prioritize systems exposing local audio device access or untrusted local users.

Validation and detection

  • Inventory Linux kernel versions against the CVE record and distro advisories.
  • Check whether the ctxfi driver is built, installed, or loaded.
  • Confirm patched kernels include the referenced ALSA ctxfi fixes or vendor backports.
  • Review kernel logs for UBSAN or audio-driver out-of-bounds reports.
Prepared
Confidence
medium
Sources
9

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2026-23076 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
8Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593, 8cc72361481f00253f1e468ade5795427386d593unaffected
LinuxLinux2.6.31, 0, 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, 6.18.8, 6.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.