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CVE-2024-42103

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix adding block group to a reclaim list and the unused list during reclaim There is a potential parallel list adding fo…

Published Jul 30, 2024EPSS 0.25%

Overview

CVE-2024-42103 is a high-severity vulnerability. It was published on July 30, 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:

btrfs: fix adding block group to a reclaim list and the unused list during reclaim

There is a potential parallel list adding for retrying in

btrfs_reclaim_bgs_work and adding to the unused list. Since the block

group is removed from the reclaim list and it is on a relocation work,

it can be added into the unused list in parallel. When that happens,

adding it to the reclaim list will corrupt the list head and trigger

list corruption like below.

Fix it by taking fs_info->unused_bgs_lock.

[177.504][T2585409] BTRFS error (device nullb1): error relocating ch= unk 2415919104

[177.514][T2585409] list_del corruption. next->prev should be ff1100= 0344b119c0, but was ff11000377e87c70. (next=3Dff110002390cd9c0)

[177.529][T2585409] ------------[ cut here ]------------

[177.537][T2585409] kernel BUG at lib/list_debug.c:65!

[177.545][T2585409] Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI

[177.555][T2585409

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/326fa14549d7969ef80d3f5beea5470cd1c8e67fRefgit.kernel.org/stable/c/48f091fd50b2eb33ae5eaea9ed3c4f81603acf38Refgit.kernel.org/stable/c/522b39bd7163e8dc49f8cf10b9b782218ac48746Refgit.kernel.org/stable/c/aa1d8cc0cc500e06b316cd6732d4e6c1388fe33cRefgit.kernel.org/stable/c/f8e960be923f74a273c62478c9cab9523936752bRefgit.kernel.org/stable/c/326fa14549d7969ef80d3f5beea5470cd1c8e67fRefgit.kernel.org/stable/c/48f091fd50b2eb33ae5eaea9ed3c4f81603acf38Refgit.kernel.org/stable/c/522b39bd7163e8dc49f8cf10b9b782218ac48746Refgit.kernel.org/stable/c/aa1d8cc0cc500e06b316cd6732d4e6c1388fe33cRefgit.kernel.org/stable/c/f8e960be923f74a273c62478c9cab9523936752b

How CyberStrike helps

Frequently asked questions

What is CVE-2024-42103?

CVE-2024-42103 is a high-severity vulnerability. It was published on July 30, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-42103?

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-2024-42103?

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-2024-42103?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-42103 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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