ClosedHighPatched

Linux Kernel: Use-After-Free (CVE-2023-0266)

Linux Kernel

Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user. Added to CISA KEV on 2023-03-30.

Why this severity: CVSS 7.0 (NVD), actively exploited (CISA KEV)

Started: Mar 30, 2023
Closed: Mar 30, 2023
CVE: CVE-2023-0266

Linux
CISA KEV
#Privilege escalation

Updated Mar 30, 2023

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Mar 30, 2023
CISA added CVE-2023-0266 to the KEV catalog (due 2023-04-20).

Advisories3

Vendor advisory: Linux KernelLinux
NVD: CVE-2023-0266NVD
CISA Known Exploited Vulnerabilities CatalogCISA · Mar 30, 2023

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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