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[ CVE-2022-0185 · Published 11 Feb 2022 ]

Linux Kernel Heap-Based Buffer Overflow Vulnerability

Exploited · CISA KEV CVSS 8.4 EPSS 25%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2024-08-21
  • EPSS: 25% chance of exploitation in the next 30 days (higher than 98% of CVEs)

[ Description ]Official description

A heap-based buffer overflow flaw was found in the way the legacy_parse_param function in the Filesystem Context functionality of the Linux kernel verified the supplied parameters length. An unprivileged (in case of unprivileged user namespaces enabled, otherwise needs namespaced CAP_SYS_ADMIN privilege) local user able to open a filesystem that does not support the Filesystem Context API (and thus fallbacks to legacy handling) could use this flaw to escalate their privileges on the system.

CISA: Linux kernel contains a heap-based buffer overflow vulnerability in the legacy_parse_param function in the Filesystem Context functionality. This allows an attacker to open a filesystem that does not support the Filesystem Context API and ultimately escalate privileges.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 11 Sep 2024): Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

[ References ]References