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CVE-2021-47567

powerpc/32: Fix hardlockup on vmap stack overflow

MEDIUM
5.5
CVSS Score
Published: May 24, 2024 at 03:12 PM UTC
Updated: June 17, 2026 at 04:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
v ≥ 5.9.55.10 ≤ v < 5.10.835.10 ≤ v < 5.15.65.10 ≤ v < 5.165.11 ≤ v < 5.15.65.9.5 ≤ v < 5.105.9.5 ≤ v < 5.10.833b234b4a6651ed6bdca94553aa0038fc7ded92715.105.16 rc15.16 rc25.9.5c118c7303ad528be8ff2aea8cd1ee15452c763f0
Vendor states this is fixed in 5bb60ea611db1e04814426ed4bd1c95d1487678e (fixed)
Vendor states this is fixed in c4e3ff8b8b1d54f0c755670174c453b06e17114b (fixed)
Vendor states this is fixed in dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7 (fixed)
Vendor states this is fixed in 5.10 (unaffected)
Vendor states this is fixed in 5.10.83 (unaffected)
Vendor states this is fixed in 5.15.6 (unaffected)
Vendor states this is fixed in 5.16 (unaffected)

References (3)

Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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