CVE-2026-23076

Memory disclosure and crash via stale mixer index

Published Feb 4, 2026 · Updated Feb 4, 2026

Out-of-bounds access in the Linux kernel ALSA ctxfi driver allows local users to read kernel memory or crash the operating system. The ctxfi audio mixer leaves the conj loop index improperly initialized, so amixer_index() and sum_index() use it to index beyond an eight-byte array. Reaching the flaw requires local low-privileged access to the affected ALSA ctxfi mixer path; the bounded outcomes are kernel-memory disclosure or a system crash.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel ALSA ctxfi driver allows local users to read kernel memory or crash the operating system. The ctxfi audio mixer leaves the conj loop index improperly initialized, so amixer_index() and sum_index() use it to index beyond an eight-byte array. Reaching the flaw requires local low-privileged access to the affected ALSA ctxfi mixer path; the bounded outcomes are kernel-memory disclosure or a system crash.

The record

CVE
CVE-2026-23076
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61006c540cbdedea83b05577dc7fb7fa18fe1276
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <873e2360d247eeee642878fcc3398babff7e387c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8c42d11b0526a89192bd2f79facb4c60c8a1f38
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d77ba72558cd66704f0fb7e0969f697e87c0f71c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61006c540cbdedea83b05577dc7fb7fa18fe1276; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <873e2360d247eeee642878fcc3398babff7e387c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8c42d11b0526a89192bd2f79facb4c60c8a1f38; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d77ba72558cd66704f0fb7e0969f697e87c0f71c

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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