SB20261023102 - Memory leak in Linux kernel net driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20261023102

SB20261023102 - Memory leak in Linux kernel net driver

Published: October 23, 2026

Security Bulletin ID SB20261023102
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) Memory leak (CVE-ID: CVE-2026-99057)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a memory leak in the Xen netfront driver's xennet_poll() error handling when processing response chains with more slots than fit in an skb's fragments. A local privileged user can control the backend to repeatedly supply oversized response chains, leaving the dequeued skb and its attached fragment pages unfreed, to exhaust kernel memory and cause a denial of service.


Remediation

Install update from vendor's website.

References