Bug 2343169 (CVE-2025-21669)

Summary: CVE-2025-21669 kernel: vsock/virtio: discard packets if the transport changes
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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Description OSIDB Bzimport 2025-01-31 12:01:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vsock/virtio: discard packets if the transport changes

If the socket has been de-assigned or assigned to another transport,
we must discard any packets received because they are not expected
and would cause issues when we access vsk->transport.

A possible scenario is described by Hyunwoo Kim in the attached link,
where after a first connect() interrupted by a signal, and a second
connect() failed, we can find `vsk->transport` at NULL, leading to a
NULL pointer dereference.
Comment 1 Pedro Sampaio 2025-01-31 18:38:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025013158-CVE-2025-21669-b52c@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:39:03 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 2025-06-09 12:55:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:8669 https://access.redhat.com/errata/RHSA-2025:8669