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CVE-2021-47493

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix race between searching chunks and release journal_head from buffer_head Encountered a race between ocfs2_test_bg_bit…

Published May 22, 2024CWE-362EPSS 0.17%

Overview

CVE-2021-47493 is a high-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

ocfs2: fix race between searching chunks and release journal_head from buffer_head

Encountered a race between ocfs2_test_bg_bit_allocatable() and

jbd2_journal_put_journal_head() resulting in the below vmcore.

PID: 106879 TASK: ffff880244ba9c00 CPU: 2 COMMAND: "loop3"

Call trace:

panic

oops_end

no_context

__bad_area_nosemaphore

bad_area_nosemaphore

__do_page_fault

do_page_fault

page_fault

[exception RIP: ocfs2_block_group_find_clear_bits+316]

ocfs2_block_group_find_clear_bits [ocfs2]

ocfs2_cluster_group_search [ocfs2]

ocfs2_search_chain [ocfs2]

ocfs2_claim_suballoc_bits [ocfs2]

__ocfs2_claim_clusters [ocfs2]

ocfs2_claim_clusters [ocfs2]

ocfs2_local_alloc_slide_window [ocfs2]

ocfs2_reserve_local_alloc_bits [ocfs2]

ocfs2_reserve_clusters_with_limit [ocfs2]

ocfs2_reserve_clusters [ocfs2]

ocfs2_lock_refcount_allocators [ocfs2]

o

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/2e382600e8856ea654677b5134ee66e03ea72bc2Refgit.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7Refgit.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558Refgit.kernel.org/stable/c/2e382600e8856ea654677b5134ee66e03ea72bc2Refgit.kernel.org/stable/c/5043fbd294f5909a080ade0f04b70a4da9e122b7Refgit.kernel.org/stable/c/6f1b228529ae49b0f85ab89bcdb6c365df401558

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47493?

CVE-2021-47493 is a high-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47493?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47493?

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-2021-47493?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47493 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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