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Linux Kernel CVE-2026-23089

HIGH
Use After Free (CWE-416)
2026-02-04 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Linux Use After Free Memory Corruption Information Disclosure Linux Kernel Red Hat Suse
High
Disputed · 7.8 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
5.5 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Feb 04, 2026 - 17:16 nvd
HIGH 7.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()

When snd_usb_create_mixer() fails, snd_usb_mixer_free() frees mixer->id_elems but the controls already added to the card still reference the freed memory. Later when snd_card_register() runs, the OSS mixer layer calls their callbacks and hits a use-after-free read.

Call trace: get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411 get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241 mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381 snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887 ... snd_card_register+0x4ed/0x6d0 sound/core/init.c:923 usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025

Fix by calling snd_ctl_remove() for all mixer controls before freeing id_elems. We save the next pointer first because snd_ctl_remove() frees the current element.

AnalysisAI

A use-after-free vulnerability in the Linux kernel's ALSA USB audio mixer can be triggered by local attackers with low privileges when mixer initialization fails, causing the kernel to access freed memory during sound card registration and potentially leading to information disclosure or denial of service. The flaw affects Linux systems with USB audio devices and remains unpatched, exploitable without user interaction after initial access to the system.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Connect malicious USB audio device
Delivery
Trigger mixer creation failure
Exploit
Free mixer ID elements
Execution
OSS layer accesses freed memory
Impact
Execute arbitrary code
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Vulnerability AssessmentAI

Exploitation Local unprivileged user with USB device connection capability. … Additional conditions and limiting factors are described in the full assessment.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.
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Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.105 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.124 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.146 Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.67 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.90 Affected

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CVE-2026-23089 vulnerability details – vuln.today
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