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CVE-2021-47623

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: powerpc/fixmap: Fix VM debug warning on unmap Unmapping a fixmap entry is done by calling __set_fixmap() with FIXMAP_PAGE_CLEAR…

Published Jul 16, 2024EPSS 0.22%

Overview

CVE-2021-47623 is a medium-severity vulnerability. It was published on July 16, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

powerpc/fixmap: Fix VM debug warning on unmap

Unmapping a fixmap entry is done by calling __set_fixmap()

with FIXMAP_PAGE_CLEAR as flags.

Today, powerpc __set_fixmap() calls map_kernel_page().

map_kernel_page() is not happy when called a second time

for the same page.

WARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8

CPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682

NIP: c0017cd4 LR: c00187f0 CTR: 00000010

REGS: e1011d50 TRAP: 0700 Not tainted (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty)

MSR: 00029032 <EE,ME,IR,DR,RI> CR: 42000208 XER: 00000000

GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c

GPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000

GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 0

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7Refgit.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03Refgit.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54eRefgit.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718Refgit.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7Refgit.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03Refgit.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54eRefgit.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47623?

CVE-2021-47623 is a medium-severity vulnerability. It was published on July 16, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47623?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47623?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47623?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47623 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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