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CVE-2023-0266

HIGHCVSS 7/10Actively ExploitedEPSS 3.70%

Last modified

CVE-2023-0266 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 3.70% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1
7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
3.70%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
DebianDebian Linux10.0
LinuxLinux Kernel>= 4.14, < 4.14.303
LinuxLinux Kernel>= 4.15, < 4.19.270
LinuxLinux Kernel>= 4.20, < 5.4.229
LinuxLinux Kernel>= 5.5, < 5.10.163
LinuxLinux Kernel>= 5.11, < 5.15.88
LinuxLinux Kernel>= 5.16, < 6.1.6

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2023-0266?
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
How severe is CVE-2023-0266?
CVE-2023-0266 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 3.70% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2023-0266?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST