CVE-2021-47567
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/05/2024
Last modified:
24/05/2024
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
powerpc/32: Fix hardlockup on vmap stack overflow<br />
<br />
Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not<br />
activate MMU before reading task struct") a vmap stack overflow<br />
results in a hard lockup. This is because emergency_ctx is still<br />
addressed with its virtual address allthough data MMU is not active<br />
anymore at that time.<br />
<br />
Fix it by using a physical address instead.