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CVE-2023-0266: Linux Kernel Use-After-Free Vulnerability

criticalknown exploitedpublic exploitCVE-2023-0266
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.

CSIRTS triage

vendor: Linuxproduct: KernelPrivilege escalation
What
Linux kernel contains a use-after-free vulnerability allowing privilege escalation.
Who is affected
Deployments of the Linux kernel.
Urgency
Critical urgency for remediation due to active exploitation.
Action
Apply the latest kernel updates to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-03-30
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-0266

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-0266coverage & exploitation statusNVD · CVE.org

Recent advisories for Linux Kernel Use-After-Free

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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