Bug 2324899 (CVE-2024-50216)

Summary: CVE-2024-50216 kernel: xfs: fix finding a last resort AG in xfs_filestream_pick_ag
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Bug Depends On: 2325127    
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Description OSIDB Bzimport 2024-11-09 11:04:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xfs: fix finding a last resort AG in xfs_filestream_pick_ag

When the main loop in xfs_filestream_pick_ag fails to find a suitable
AG it tries to just pick the online AG.  But the loop for that uses
args->pag as loop iterator while the later code expects pag to be
set.  Fix this by reusing the max_pag case for this last resort, and
also add a check for impossible case of no AG just to make sure that
the uninitialized pag doesn't even escape in theory.
Comment 1 Avinash Hanwate 2024-11-11 07:04:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110924-CVE-2024-50216-a031@gregkh/T
Comment 2 errata-xmlrpc 2025-05-13 08:34:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966