CVE-2026-100080
xen-netback: Fix UAF when reading statistics data
Description
In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix UAF when reading statistics data The network statistic data in the driver is protected by RCU. Unfortunately when tearing down the queues after an error during connecting to the frontend (e.g. due to illegal Xenstore data filled in by the guest), the statistic data is being freed without synchronizing the RCU state. In case the data is being read via sysfs in this phase, access to already freed memory or memory being in new use is possible. Fix that by calling synchronize_net() before freeing the queue data. This is XSA-526 / CVE-2026-100080
INFO
Published Date :
Nov. 6, 2026, 7:17 p.m.
Last Modified :
Nov. 6, 2026, 7:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply the kernel patch that synchronizes RCU state.
- Update the Linux kernel to the fixed version.
- Ensure proper error handling for Xenstore data.
- Validate Xenstore data from guests.
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-2026-100080.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-100080 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-2026-100080
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).
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The following list is the news that have been mention
CVE-2026-100080 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-100080 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.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Nov. 06, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: xen-netback: Fix UAF when reading statistics data The network statistic data in the driver is protected by RCU. Unfortunately when tearing down the queues after an error during connecting to the frontend (e.g. due to illegal Xenstore data filled in by the guest), the statistic data is being freed without synchronizing the RCU state. In case the data is being read via sysfs in this phase, access to already freed memory or memory being in new use is possible. Fix that by calling synchronize_net() before freeing the queue data. This is XSA-526 / CVE-2026-100080 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100080.json">CVE-2026-100080</a> Added Reference https://git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518 Added Reference https://git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6 Added Reference https://git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a Added Reference https://git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02 Added Reference https://git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a Added Reference https://git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3a Added Reference https://git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7a -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 06, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/11/06/9 Added Reference http://xenbits.xen.org/xsa/advisory-526.html