Bug 2343173 (CVE-2025-21666)

Summary: CVE-2025-21666 kernel: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]
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
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-01-31 12:01:51 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

Recent reports have shown how we sometimes call vsock_*_has_data()
when a vsock socket has been de-assigned from a transport (see attached
links), but we shouldn't.

Previous commits should have solved the real problems, but we may have
more in the future, so to avoid null-ptr-deref, we can return 0
(no space, no data available) but with a warning.

This way the code should continue to run in a nearly consistent state
and have a warning that allows us to debug future problems.
Comment 1 Pedro Sampaio 2025-01-31 18:28:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025013157-CVE-2025-21666-465a@gregkh/T
Comment 3 errata-xmlrpc 2025-05-13 08:39:06 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