CVE-2024-39476
Linux Kernel - MD RAID Deadlock Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING Xiao reported that lvm2 test lvconvert-raid-takeover.sh can hang with small possibility, the root cause is exactly the same as commit bed9e27baf52 ("Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"") However, Dan reported another hang after that, and junxiao investigated the problem and found out that this is caused by plugged bio can't issue from raid5d(). Current implementation in raid5d() has a weird dependence: 1) md_check_recovery() from raid5d() must hold 'reconfig_mutex' to clear MD_SB_CHANGE_PENDING; 2) raid5d() handles IO in a deadloop, until all IO are issued; 3) IO from raid5d() must wait for MD_SB_CHANGE_PENDING to be cleared; This behaviour is introduce before v2.6, and for consequence, if other context hold 'reconfig_mutex', and md_check_recovery() can't update super_block, then raid5d() will waste one cpu 100% by the deadloop, until 'reconfig_mutex' is released. Refer to the implementation from raid1 and raid10, fix this problem by skipping issue IO if MD_SB_CHANGE_PENDING is still set after md_check_recovery(), daemon thread will be woken up when 'reconfig_mutex' is released. Meanwhile, the hang problem will be fixed as well.
INFO
Published Date :
July 5, 2024, 7:15 a.m.
Last Modified :
Nov. 21, 2024, 9:27 a.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-39476.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-39476 vulnerability anywhere in the article.
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tripwire.com
VERT Threat Alert: August 2024 Patch Tuesday Analysis
Today’s VERT Alert addresses Microsoft’s August 2024 Security Updates. VERT is actively working on coverage for these vulnerabilities and expects to ship ASPL-1119 as soon as coverage is completed.CVE ... Read more
The following table lists the changes that have been made to the
CVE-2024-39476 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a Added Reference https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0fa Added Reference https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b Added Reference https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4 Added Reference https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787 Added Reference https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347 Added Reference https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447 Added Reference https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7 -
Initial Analysis by [email protected]
Jul. 08, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a No Types Assigned https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0fa No Types Assigned https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0fa Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b No Types Assigned https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4 No Types Assigned https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4 Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787 No Types Assigned https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787 Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347 No Types Assigned https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347 Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447 No Types Assigned https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447 Mailing List, Patch Changed Reference Type https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7 No Types Assigned https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7 Mailing List, Patch Added CWE NIST CWE-667 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.19 up to (excluding) 4.19.316 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4 up to (excluding) 5.4.278 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.10 up to (excluding) 5.10.219 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.15 up to (excluding) 5.15.161 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1 up to (excluding) 6.1.94 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6 up to (excluding) 6.6.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.9 up to (excluding) 6.9.5 -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 05, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix deadlock that raid5d() wait for itself to clear MD_SB_CHANGE_PENDING Xiao reported that lvm2 test lvconvert-raid-takeover.sh can hang with small possibility, the root cause is exactly the same as commit bed9e27baf52 ("Revert "md/raid5: Wait for MD_SB_CHANGE_PENDING in raid5d"") However, Dan reported another hang after that, and junxiao investigated the problem and found out that this is caused by plugged bio can't issue from raid5d(). Current implementation in raid5d() has a weird dependence: 1) md_check_recovery() from raid5d() must hold 'reconfig_mutex' to clear MD_SB_CHANGE_PENDING; 2) raid5d() handles IO in a deadloop, until all IO are issued; 3) IO from raid5d() must wait for MD_SB_CHANGE_PENDING to be cleared; This behaviour is introduce before v2.6, and for consequence, if other context hold 'reconfig_mutex', and md_check_recovery() can't update super_block, then raid5d() will waste one cpu 100% by the deadloop, until 'reconfig_mutex' is released. Refer to the implementation from raid1 and raid10, fix this problem by skipping issue IO if MD_SB_CHANGE_PENDING is still set after md_check_recovery(), daemon thread will be woken up when 'reconfig_mutex' is released. Meanwhile, the hang problem will be fixed as well. Added Reference kernel.org https://git.kernel.org/stable/c/b32aa95843cac6b12c2c014d40fca18aef24a347 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/634ba3c97ec413cb10681c7b196db43ee461ecf4 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/aa64464c8f4d2ab92f6d0b959a1e0767b829d787 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/098d54934814dd876963abfe751c3b1cf7fbe56a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/3f8d5e802d4cedd445f9a89be8c3fd2d0e99024b [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/cd2538e5af495b3c747e503db346470fc1ffc447 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e332a12f65d8fed8cf63bedb4e9317bb872b9ac7 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/151f66bb618d1fd0eeb84acb61b4a9fa5d8bb0fa [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-39476 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-39476
weaknesses.