SB2026072152 - Improper Initialization in Linux kernel nfsd

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Main Vulnerability Database SB2026072152

SB2026072152 - Improper Initialization in Linux kernel nfsd

Published: July 21, 2026

Security Bulletin ID SB2026072152
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Initialization (CVE-ID: CVE-2026-53398)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper initialization in nfsd4_decode_secinfo_no_name() when processing a truncated XDR stream for the SECINFO_NO_NAME operation. A remote attacker can send a specially crafted request to cause a denial of service.

The issue occurs because stale union contents from a previous operation can leave sin_exp non-NULL, leading the error cleanup path to call exp_put() on an invalid value.


Remediation

Install update from vendor's website.

References