Bug 2297577 (CVE-2024-40993)

Summary: CVE-2024-40993 kernel: netfilter: ipset: Fix suspicious rcu_dereference_protected()
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   
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Fixed In Version: kernel 6.1.96, kernel 6.6.36, kernel 6.9.7, kernel 6.10-rc5 Doc Type: If docs needed, set a value
Doc Text:
A suspicious rcu_dereference_protected() was observed in netfilter in the Linux kernel. This may lead to a loss of Availability.
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Description OSIDB Bzimport 2024-07-12 13:48:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: Fix suspicious rcu_dereference_protected()

When destroying all sets, we are either in pernet exit phase or
are executing a "destroy all sets command" from userspace. The latter
was taken into account in ip_set_dereference() (nfnetlink mutex is held),
but the former was not. The patch adds the required check to
rcu_dereference_protected() in ip_set_dereference().