SB20261106119 - Use-after-free in Linux kernel net xen-netback driver

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Main Vulnerability Database SB20261106119

SB20261106119 - Use-after-free in Linux kernel net xen-netback driver

Published: November 6, 2026

Security Bulletin ID SB20261106119
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) Use-after-free (CVE-ID: CVE-2026-100080)

CWE-ID: CWE-416 - Use After Free

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


The vulnerability allows a local privileged user to cause a denial of service or potentially disclose sensitive information.

The vulnerability exists due to a use-after-free in the Linux kernel xen-netback driver when queue teardown following a frontend connection error frees statistics data without synchronizing RCU readers. A local privileged user can supply invalid Xenstore data from a guest to trigger this error path while statistics are being read through sysfs, potentially causing a kernel crash or exposing information from freed or reused memory.


Remediation

Install update from vendor's website.

References