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Vulnerabilities/CVE-2023-0266Public Intelligence Dossier
Source: debian · Limited verification•Last verified: •Collection Degraded
CVE-2023-0266ListedHIGH (raw)CVSS 7.9CWE-416

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel

Published: 30 Jan 2023•Last updated: 17 Jun 2026, 10:55 AM IST•Source identifier: cve-coordination@google.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance not available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added30 Mar 2023
Due20 Apr 2023
RansomwareUnknown
CVSS score
7.9HIGH (raw)
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
Metric sourcecve-coordination@google.com
EPSS probability
3.7%0.037
Percentile90th
Weakness type
CWE-416
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; SOC ecosystem technology relevance; HIGH severity; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

2 source-backed products
Affected products and versions (source)
  • debian debian linux · 10.0 · NVD CPE · Source
  • linux linux kernel · >= 4.14 < 4.14.303; >= 4.15 < 4.19.270; >= 4.20 < 5.4.229; >= 5.5 < 5.10.163; >= 5.11 < 5.15.88; >= 5.16 < 6.1.6 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: Apply updates per vendor instructions.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: Apply updates per vendor instructions.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

No rule-based guidance for this vulnerability class

CISA KEV Record

Catalog entry
30 Mar 2023
Required action due
20 Apr 2023
Known ransomware use
Unknown

Apply updates per vendor instructions.

Change History & Source Data

— No recorded material change

CNA / source
cve-coordination@google.com
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*, cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2023-03-30git.kernel.orgSource recordnvd.nist.govSource recordgithub.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2023-0266
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2023-0266
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2023-0266"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.