Bug 2313149 (CVE-2024-46801)

Summary: CVE-2024-46801 kernel: libfs: fix get_stashed_dentry()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2313284    
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Description OSIDB Bzimport 2024-09-18 08:23:44 UTC 
In the Linux kernel, the following vulnerability has been resolved:

libfs: fix get_stashed_dentry()

get_stashed_dentry() tries to optimistically retrieve a stashed dentry
from a provided location.  It needs to ensure to hold rcu lock before it
dereference the stashed location to prevent UAF issues.  Use
rcu_dereference() instead of READ_ONCE() it's effectively equivalent
with some lockdep bells and whistles and it communicates clearly that
this expects rcu protection.
Comment 1 Michal Findra 2024-09-18 12:45:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091857-CVE-2024-46801-3cb7@gregkh/T