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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2024-43914 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: md/raid5: avoid BUG_ON() while continue reshape after reassembling Currently, mdadm support --revert-reshape to abort the reshape while reassembling, as the test 07revert-grow. However, following BUG_ON() can be triggerred by the test: kernel BUG at drivers/md/raid5.c:6278! invalid opcode: 0000 [#1] PREEMPT SMP PTI irq event stamp: 158985 CPU: 6 PID: 891 Comm: md0_reshape Not tainted 6.9.0-03335-g7592a0b0049a #94 RIP: 0010:reshape_request+0x3f1/0xe60 Call Trace: <TASK> raid5_sync_request+0x43d/0x550 md_do_sync+0xb7a/0x2110 md_thread+0x294/0x2b0 kthread+0x147/0x1c0 ret_from_fork+0x59/0x70 ret_from_fork_asm+0x1a/0x30 </TASK> Root cause is that --revert-reshape update the raid_disks from 5 to 4, while reshape position is still set, and after reassembling the array, reshape position will be read from super block, then during reshape the checking of 'writepos' that is caculated by old reshape position will fail. Fix this panic the easy way first, by converting the BUG_ON() to WARN_ON(), and stop the reshape if checkings fail. Noted that mdadm must fix --revert-shape as well, and probably md/raid should enhance metadata validation as well, however this means reassemble will fail and there must be user tools to fix the wrong metadata.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
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References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/2c92f8c1c456d556f15cbf51667b385026b2e6a0 Patch 
https://git.kernel.org/stable/c/305a5170dc5cf3d395bb4c4e9239bca6d0b54b49 Patch 
https://git.kernel.org/stable/c/3b33740c1750a39e046339ff9240e954f0156707 Patch 
https://git.kernel.org/stable/c/4811d6e5d9f4090c3e0ff9890eb24077108046ab Patch 
https://git.kernel.org/stable/c/6b33c468d543f6a83de2d61f09fec74b27e19fd2 Patch 
https://git.kernel.org/stable/c/775a9ba16c9ffe98fe54ebf14e55d5660f2bf600 Patch 
https://git.kernel.org/stable/c/bf0ff69a42a3d2d46876d0514ecf13dffc516666 Patch 
https://git.kernel.org/stable/c/c384dd4f1fb3b14a2fd199360701cc163ea88705 Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-43914
NVD Published Date:
08/26/2024
NVD Last Modified:
09/05/2024
Source:
kernel.org