SB20260919106 - Incorrect Calculation of Buffer Size in Linux kernel NFSv4.2 flexfiles layoutstats encoder

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Main Vulnerability Database SB20260919106

SB20260919106 - Incorrect Calculation of Buffer Size in Linux kernel NFSv4.2 flexfiles layoutstats encoder

Published: September 19, 2026

Security Bulletin ID SB20260919106
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) Incorrect Calculation of Buffer Size (CVE-ID: CVE-2026-90103)

CWE-ID: CWE-131 - Incorrect Calculation of Buffer Size

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 incorrect buffer size calculation in the NFSv4.2 flexfiles layoutstats encoder when encoding layout statistics for a flexfiles layout. A remote attacker can provide crafted server-controlled filehandle and network-address data to exhaust the send buffer and leave a lock permanently held to cause a denial of service.


Remediation

Install update from vendor's website.

References