Bug 2311706 (CVE-2024-45009)

Summary: CVE-2024-45009 kernel: mptcp: pm: only decrement add_addr_accepted for MPJ req
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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Hardware: All   
OS: Linux   
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Bug Depends On: 2311733    
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Description OSIDB Bzimport 2024-09-11 16:20:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mptcp: pm: only decrement add_addr_accepted for MPJ req

Adding the following warning ...

  WARN_ON_ONCE(msk->pm.add_addr_accepted == 0)

... before decrementing the add_addr_accepted counter helped to find a
bug when running the "remove single subflow" subtest from the
mptcp_join.sh selftest.

Removing a 'subflow' endpoint will first trigger a RM_ADDR, then the
subflow closure. Before this patch, and upon the reception of the
RM_ADDR, the other peer will then try to decrement this
add_addr_accepted. That's not correct because the attached subflows have
not been created upon the reception of an ADD_ADDR.

A way to solve that is to decrement the counter only if the attached
subflow was an MP_JOIN to a remote id that was not 0, and initiated by
the host receiving the RM_ADDR.
Comment 1 Michal Findra 2024-09-11 16:36:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091104-CVE-2024-45009-24ea@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:28:05 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