Bug 2422768 (CVE-2025-68243)

Summary: CVE-2025-68243 kernel: NFS: Check the TLS certificate fields in nfs_match_client()
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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A flaw was found in the NFS client's connection matching logic in the Linux kernel. When using TLS with X.509 certificates (RPC_XPRTSEC_TLS_X509), nfs_match_client() does not verify the cert_serial and privkey_serial fields. This could allow unintended client connection reuse between sessions with different TLS identities.
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Description OSIDB Bzimport 2025-12-16 15:03:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

NFS: Check the TLS certificate fields in nfs_match_client()

If the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the
cert_serial and privkey_serial fields need to match as well since they
define the client's identity, as presented to the server.
Comment 1 Alexander B 2025-12-16 21:41:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121633-CVE-2025-68243-cdd0@gregkh/T