Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-47567

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
24/05/2024
Last modified:
18/09/2025

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.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.9.5 (including) 5.10.83 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.6 (excluding)
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools