CVE-2023-0266

Status: AnalyzedHigh (7)⚠ Active exploitation💥 PoC

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

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Base score: 7

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 3.70%
Percentile among all scored CVEs: 89
Score date: 10/8/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

CISA KEV — actively exploited

Added to catalog: 3/30/2023
Remediation due date: 4/20/2023
Known ransomware use: Unknown

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation95 %
Secondary impactT1548 Abuse Elevation Control Mechanismprivilege escalation85 %

Use-after-free en ALSA PCM (CWE-416) con acceso local y permisos limitados (AV:L/PR:L) permite escalada de privilegios a ring0. Impacta ejecución de comandos con privilegios elevados.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Execution Prevention Update Software User Account Management Threat Intelligence Program Restrict File and Directory Permissions Privileged Account Management

Affected technologies (2)

Debian — Debian Linux Linux — Linux Kernel

CWEs

CWE-416
CWE-416

References

Raw JSON (NVD)

Show

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