CVE-2023-0266

Advisory lineage Upstream: 0 Downstream: 67
Analyzed
Published: 30 Jan 2023, 13:09
Last modified:21 Oct 2025, 23:15

Vulnerability Summary

Overall Risk (default)
medium
32/100
CVSS Score
7.9 HIGH
v3.1 (cve.org)
EPSS Score
0.18% LOW
0% probability +0.09%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

30 Jan 2023, 13:09
Published
Vulnerability first disclosed
30 Mar 2023, 00:00
Added to CISA KEV
Linux Kernel Use-After-Free Vulnerability
20 Apr 2023, 00:00
CISA Remediation Due
Apply updates per vendor instructions.
21 Oct 2025, 23:15
Last Modified
Vulnerability information updated

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

CVSS Metrics

  • v3.1•HIGH•Score: 7.9CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
  • v3.1•HIGH•Score: 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.18%• Percentile: 39%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • debian•debian_linux

    10.0

  • 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 | ≥ 4.14, < 56b88b50565cd8b946a2d00b0c83927b7ebb055e

References (5)