CVE-2026-99286

0.0

xen-netback: Fix XenBus connection failure cleanup

Overview
Vulnerability Timeline

Overview

Description

In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix XenBus connection failure cleanup xenvif_get_stats and xenvif_get_ethtool_stats capture vif->num_queues under rcu_read_lock. We need to unpublish vif->num_queues before synchronize_net to ensure that readers that come afterwards will not read a non-zero vif->num_queues and attempt to access invalid queues. This is the same cleanup algorithm as used in backend_disconnect and added in commit b17075d5c198 ("xen-netback: fix race condition on XenBus disconnect"). This is XSA-531

Details

INFO

Published Date :

Nov. 10, 2026, 7:22 p.m.

Last Modified :

Nov. 10, 2026, 9:22 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Impact

Affected Products

The following products are affected by CVE-2026-99286 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Linux	linux_kernel

: Total Affected Vendor : 1 | Products : 1

Solution

Apply kernel updates to fix a race condition in XenBus connection cleanup.

Update the Linux kernel to the latest version.
Ensure XenBus connection cleanup is properly synchronized.
Review XenBus queue access after rcu_read_lock.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-99286.

URL	Resource
https://git.kernel.org/stable/c/07aca7d25ce8578fedde49855983a01c537a782b
https://git.kernel.org/stable/c/a97aa838903d15f865d80809f5198ff459c6634a
https://git.kernel.org/stable/c/ade3082dcdee17c5767069883936d64ff83f6c9f
http://www.openwall.com/lists/oss-security/2026/11/10/25
http://xenbits.xen.org/xsa/advisory-531.html

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-99286 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-99286 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-99286 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-99286 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

CVE Modified by af854a3a-2127-422b-91ae-364da2661108

Nov. 10, 2026

Action	Type	Old Value	New Value
Added	Reference		http://www.openwall.com/lists/oss-security/2026/11/10/25
Added	Reference		http://xenbits.xen.org/xsa/advisory-531.html

New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67