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CVE

CVE-2023-0266

Linux Kernel Use-After-Free Vulnerability

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.

HIGH · CVSS 7.9 ⚠ CISA KEV EPSS 0.00178
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-416Use After Free
CWE-416Use After Free
▤

Affected Products & Versions

7
debian linuxall versions
linux kernel>= 4.14 and < 4.14.303
linux kernel>= 4.15 and < 4.19.270
linux kernel>= 4.20 and < 5.4.229
linux kernel>= 5.5 and < 5.10.163
linux kernel>= 5.11 and < 5.15.88
linux kernel>= 5.16 and < 6.1.6
▣

Scoring & Timeline

7.9
HIGH · CVSS v3.1 · cve-coordination@google.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD30 Jan 2023 · 02:15 PM
CVSS VectorCVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
rhsaRHSA-2023:1554Low
suse-csafSUSE-SU-2023:0618-1
android-securityANDROID-2023-05-01High
usnUSN-6030-1
usnUSN-6009-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055ePatch
https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1Patch
https://lists.debian.org/debian-lts-announce/2023/05/msg00006.htmlMailing ListThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266US Government Resource
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