CISA KEV · Known exploitedHigh

CVE-2023-0266

Linux Kernel

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: 7
EPSS: 3.70%
CISA KEV: Listed
Published: 2023.01.30

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability3.70%

Technical severityCVSS 7

Vulnerability overview

Affected product and versions

Product: Linux Kernel
Affected versions: 4.14, 10.0, >= 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
Fixed versions: 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.88, 6.1.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2023.04.20

1
Identify
Confirm that Linux Kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416
KEV added: 2023.03.30
Ransomware use: 미확인