Bug 2272777 (CVE-2024-26658) - CVE-2024-26658 kernel: bcachefs: grab s_umount only if snapshotting
Summary: CVE-2024-26658 kernel: bcachefs: grab s_umount only if snapshotting
Keywords:
Status: NEW
Alias: CVE-2024-26658
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2272778
Blocks: 2272924
TreeView+ depends on / blocked
 
Reported: 2024-04-02 23:01 UTC by Mauro Matteo Cascella
Modified: 2024-07-19 12:43 UTC (History)
50 users (show)

Fixed In Version: kernel 6.7.5, kernel 6.8
Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in the bcachefs Linux kernel module which allows to a circular locking dependency, triggering a deadlock scenario during snapshot creation operations. This occurred due to the unconditional acquisition of s_umount in __bch2_ioctl_subvolume_create(), conflicting with existing locks held by other threads which leads to a deadlock situations.
Clone Of:
Environment:
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Description Mauro Matteo Cascella 2024-04-02 23:01:24 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bcachefs: grab s_umount only if snapshotting

The Linux kernel CVE team has assigned CVE-2024-26658 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024040222-CVE-2024-26658-1451@gregkh/T
Comment 1 Mauro Matteo Cascella 2024-04-02 23:02:01 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2272778]
Comment 5 Justin M. Forbes 2024-04-03 16:55:09 UTC 
This was fixed for Fedora with the 6.7.5 stable kernel updates.
Comment 6 Alex 2024-06-09 13:13:43 UTC 
The result of automatic check (that is developed by Alexander Larkin) for this CVE-2024-26658 is: 	SKIP	No affected files built, so skip this CVE	NO			-	-	unknown (where first YES/NO value means if related sources built).
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