Bug 2401555 (CVE-2023-53543)

Summary: CVE-2023-53543 kernel: vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-04 16:07:12 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check

The vdpa_nl_policy structure is used to validate the nlattr when parsing
the incoming nlmsg. It will ensure the attribute being described produces
a valid nlattr pointer in info->attrs before entering into each handler
in vdpa_nl_ops.

That is to say, the missing part in vdpa_nl_policy may lead to illegal
nlattr after parsing, which could lead to OOB read just like CVE-2023-3773.

This patch adds the missing nla_policy for vdpa max vqp attr to avoid
such bugs.
Comment 1 Alexander B 2025-10-06 12:10:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100445-CVE-2023-53543-227c@gregkh/T