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CVE-2021-21781

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

POC

Reference

- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1243

- https://www.oracle.com/security-alerts/cpujul2022.html

Github

No PoCs found on GitHub currently.