SB20261022145 - Out-of-bounds write in Linux kernel net vxlan driver

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Main Vulnerability Database SB20261022145

SB20261022145 - Out-of-bounds write in Linux kernel net vxlan driver

Published: October 22, 2026

Security Bulletin ID SB20261022145
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-98568)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to corrupt kernel memory and potentially cause a denial of service.

The vulnerability exists due to an out-of-bounds write caused by a time-of-check to time-of-use race in the Linux kernel VXLAN function vxlan_na_create() when allocating and reserving headroom for neighbour replies. A local privileged user can trigger neighbour reply generation concurrently with link headroom changes through vxlan_changelink() to cause an Ethernet header write beyond the allocated socket buffer, potentially causing a denial of service.


Remediation

Install update from vendor's website.

References