CVE-2022-50861
Unknown Unknown - Not Provided

Information Leak in Linux Kernel NFSD Due to XDR Encoder Bug

Publication date: 2025-12-30

Last updated on: 2025-12-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Finish converting the NFSv2 GETACL result encoder The xdr_stream conversion inadvertently left some code that set the page_len of the send buffer. The XDR stream encoders should handle this automatically now. This oversight adds garbage past the end of the Reply message. Clients typically ignore the garbage, but NFSD does not need to send it, as it leaks stale memory contents onto the wire.

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Meta Information

Published
2025-12-30
Last Modified
2025-12-30
Generated
2026-07-06
AI Q&A
2025-12-30
EPSS Evaluated
2026-07-05
NVD
CVE-2022-50861
EUVD
EUVD-2022-55837

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is in the Linux kernel's NFSD component related to NFSv2 GETACL result encoding. The issue was that the xdr_stream conversion code incorrectly set the page_len of the send buffer, causing extra garbage data past the end of the Reply message. This garbage data leaks stale memory contents onto the network wire, although clients typically ignore it. The fix involved ensuring the XDR stream encoders handle the page_len automatically, preventing this memory leakage.

Impact Analysis

The vulnerability can lead to leakage of stale memory contents over the network when using the NFSD NFSv2 GETACL functionality. This could potentially expose sensitive or unintended data to clients, although clients typically ignore the extra garbage data. Nonetheless, it represents an information disclosure risk.

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