CVE-2021-47567: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.

Affected products

• Linux Linux Kernel: from 5.9.5, before 5.10.83 (fixed in 5.10.83); from 5.11, before 5.15.6 (fixed in 5.15.6); version 5.16 only

Published 2024-05-24. Last modified 2026-06-17.