BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix null pointer dereference on zero-length checksum In xdr_stream_decode_opaque_auth(), zero-length checksum.len causes checksum.data to be set to NULL. This triggers a NPD when accessing checksum.data in gss_krb5_verify_mic_v2(). This patch ensures that the value of checksum.len is not less than XDR_UNIT.

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Meta Information

Published

2025-11-12

Last Modified

2025-11-12

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40129

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is a null pointer dereference in the Linux kernel's sunrpc component. Specifically, in the function xdr_stream_decode_opaque_auth(), when a zero-length checksum is processed, the checksum.data pointer is set to NULL. Later, when gss_krb5_verify_mic_v2() tries to access this NULL pointer, it causes a null pointer dereference, which can lead to a crash or other unintended behavior. The fix ensures that the checksum length is never less than a defined minimum (XDR_UNIT), preventing checksum.data from being NULL.

Impact Analysis

This vulnerability can cause a null pointer dereference in the Linux kernel, potentially leading to a system crash or denial of service. This could disrupt normal operations on affected systems using the sunrpc component, impacting availability.

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