Bug 2493385 (CVE-2026-57918)

Summary: CVE-2026-57918 libnfs: libnfs: Information disclosure and data manipulation vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in libnfs. When connecting to a malicious Network File System (NFS) server, an integer underflow vulnerability occurs due to an issue in handling the expected data unit size. This flaw could allow a remote attacker to disclose sensitive information and potentially manipulate data on the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2493608, 2493609    
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Description OSIDB Bzimport 2026-06-26 11:01:26 UTC
libnfs through 6.0.2 before f0b109d has an xid integer underflow in READ_IOVEC in rpc_read_from_socket in lib/socket.c during a connection to a crafted NFS server, when the expected pdu size exceeds the absolute pdu size from the xid/record-marker.