Bug 2300398 (CVE-2024-41032)

Summary: CVE-2024-41032 kernel: mm: vmalloc: check if a hash-index is in cpu_possible_mask
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 6.6.41, kernel 6.9.10, kernel 6.10 Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was found in the Linux kernel that involves improper handling of per-CPU data in systems where cpu_possible_mask has gaps between CPUs. This can lead to an index which accesses non-existent or unset CPU areas and potentially causes kernel crashes.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2301533    
Bug Blocks:    

Description OSIDB Bzimport 2024-07-29 15:31:37 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mm: vmalloc: check if a hash-index is in cpu_possible_mask

The problem is that there are systems where cpu_possible_mask has gaps
between set CPUs, for example SPARC.  In this scenario addr_to_vb_xa()
hash function can return an index which accesses to not-possible and not
setup CPU area using per_cpu() macro.  This results in an oops on SPARC.

A per-cpu vmap_block_queue is also used as hash table, incorrectly
assuming the cpu_possible_mask has no gaps.  Fix it by adjusting an index
to a next possible CPU.
Comment 1 Mauro Matteo Cascella 2024-07-30 08:54:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024072922-CVE-2024-41032-6284@gregkh/T
Comment 2 Mauro Matteo Cascella 2024-07-30 08:54:56 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2301533]
Comment 6 errata-xmlrpc 2024-11-12 09:36:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:9315 https://access.redhat.com/errata/RHSA-2024:9315