VULNERABILITY INTELLIGENCE

CVE-2021-21781

CVSS score3.3 LOW
EPSS probability0.50%
CISA KEVNot currently listed
Published2021-08-18
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Description

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

Weakness classification

  • talos-cna@cisco.com: CWE-908
  • nvd@nist.gov: CWE-908

Primary references