Bug 2317601 (CVE-2024-47668)

Summary: CVE-2024-47668 kernel: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Bug Depends On: 2317861    
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Description OSIDB Bzimport 2024-10-09 15:03:19 UTC 
In the Linux kernel, the following vulnerability has been resolved:

lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

If we need to increase the tree depth, allocate a new node, and then
race with another thread that increased the tree depth before us, we'll
still have a preallocated node that might be used later.

If we then use that node for a new non-root node, it'll still have a
pointer to the old root instead of being zeroed - fix this by zeroing it
in the cmpxchg failure path.
Comment 1 errata-xmlrpc 2024-11-05 00:50:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:8870 https://access.redhat.com/errata/RHSA-2024:8870
Comment 2 errata-xmlrpc 2024-11-05 01:10:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:8856 https://access.redhat.com/errata/RHSA-2024:8856
Comment 3 errata-xmlrpc 2025-05-13 08:28:56 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
Comment 4 errata-xmlrpc 2025-05-14 00:34:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:7526 https://access.redhat.com/errata/RHSA-2025:7526