Bug 2297556 (CVE-2024-40972)

Summary: CVE-2024-40972 kernel: ext4: do not create EA inode under buffer lock
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 6.9.7, kernel 6.10-rc1 Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in the Linux kernel's ext4 filesystem, where the system could create EA inodes while holding a buffer lock, this approach can lead to deadlocks, especially if the filesystem is corrupted.
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Description OSIDB Bzimport 2024-07-12 13:43:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ext4: do not create EA inode under buffer lock

ext4_xattr_set_entry() creates new EA inodes while holding buffer lock
on the external xattr block. This is problematic as it nests all the
allocation locking (which acquires locks on other buffers) under the
buffer lock. This can even deadlock when the filesystem is corrupted and
e.g. quota file is setup to contain xattr block as data block. Move the
allocation of EA inode out of ext4_xattr_set_entry() into the callers.
Comment 11 errata-xmlrpc 2024-09-24 00:39:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:7001 https://access.redhat.com/errata/RHSA-2024:7001
Comment 12 errata-xmlrpc 2024-09-24 02:34:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:7000 https://access.redhat.com/errata/RHSA-2024:7000
Comment 13 errata-xmlrpc 2024-10-30 01:26:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:8617 https://access.redhat.com/errata/RHSA-2024:8617