CVE-2026-43126

Kernel memory corruption via unchecked card disconnect

Published May 6, 2026 · Updated May 6, 2026

Use-after-free in the Linux kernel ALSA OSS mixer allows local users to corrupt kernel memory during audio-device disconnect. The OSS mixer entry points in sound/core/oss/mixer_oss.c invoke kcontrol operations without first checking card disconnection while holding the controls semaphore. Triggering requires low-privileged access to an ALSA OSS device node and a concurrent card disconnect; stale control access can compromise kernel confidentiality, integrity, and availability.

CVSS severity7.8
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

Use-after-free in the Linux kernel ALSA OSS mixer allows local users to corrupt kernel memory during audio-device disconnect. The OSS mixer entry points in sound/core/oss/mixer_oss.c invoke kcontrol operations without first checking card disconnection while holding the controls semaphore. Triggering requires low-privileged access to an ALSA OSS device node and a concurrent card disconnect; stale control access can compromise kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2026-43126
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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 <084d5d44418148662365eced3e126ad1a81ee3e2
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c097cf736993454acf3f711a3b376d6c7ad8965
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae583f113d15fa97e5234133c20d09f8e6214e47
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6645e625480cdf1079a4265f758d13b70721029

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <084d5d44418148662365eced3e126ad1a81ee3e2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c097cf736993454acf3f711a3b376d6c7ad8965; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ae583f113d15fa97e5234133c20d09f8e6214e47; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e6645e625480cdf1079a4265f758d13b70721029

Published CVSS scores

7.1Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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