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[ CVE-2022-0847 · Published 10 Mar 2022 ]

Linux Kernel Privilege Escalation Vulnerability

Exploited · CISA KEV CVSS 7.8 EPSS 93%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-04-25
  • EPSS: 93% chance of exploitation in the next 30 days (higher than 100% of CVEs)

[ Description ]Official description

A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe and push_pipe functions in the Linux kernel and could thus contain stale values. An unprivileged local user could use this flaw to write to pages in the page cache backed by read only files and as such escalate their privileges on the system.

CISA: Linux kernel contains an improper initialization vulnerability where an unprivileged local user could escalate their privileges on the system. This vulnerability has the moniker of "Dirty Pipe."

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 16 May 2022): Apply updates per vendor instructions.

[ References ]References