Linux Kernel: security vulnerability (CVE-2026-100080)
Published Last modified Sources: CVE.org
What is affected, what to do
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.
Update Linux Kernel to version 5.10.274, Linux Kernel to version 5.15.225, Linux Kernel to version 6.1.192.
- Affected
- Linux Kernel
lt *..5.10.274 - Linux Kernel
lt 5.11..5.15.225 - Linux Kernel
lt 5.16..6.1.192 - Linux Kernel
lt 6.2..6.6.162 - Linux Kernel
lt 6.7..6.12.116 - Linux Kernel
lt 6.13..6.18.62 - Linux Kernel
lt 6.19..7.3.3
- Linux Kernel
- Fixed in
- Linux Kernel
5.10.274 - Linux Kernel
5.15.225 - Linux Kernel
6.1.192 - Linux Kernel
6.6.162 - Linux Kernel
6.12.116 - Linux Kernel
6.18.62 - Linux Kernel
7.3.3
- Linux Kernel
Not sure whether and how you are affected? Ask a question about this vulnerability
Metrics
—
Priority
No value is available for this vulnerability.
—
CVSS v3
No value is available for this vulnerability.
—
EPSS score
No value is available for this vulnerability.
Show all metrics
- Severity
- Not rated
Priority (0–325)
The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?
Read in glossary- 30.00 Methodology
Exploit maturity
An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.
Read in glossary- no public PoC known
KEV status
The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.
Read in glossary- —
- Published
Detection rules
No NEOSEC detection rule is available for this vulnerability yet.
Classification under NIS2 and CRA
Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.
NIS2
NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.
Read in glossary- Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
CRA
The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.
Read in glossary- From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001
ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.
Read in glossary- Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.
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
Source: cvelistv5, NVD (NIST)
Affected products
The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.
| Affected versions | Fixed in | ||
|---|---|---|---|
| Linux | Linux |
|
|
Vendors and products
References & sources
- git.kernel.orgstable/c/36f858f228e3f955b9336af7f94634747c221518
- git.kernel.orgstable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6
- git.kernel.orgstable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a
- git.kernel.orgstable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02
- git.kernel.orgstable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467a
- git.kernel.orgstable/c/89e534265b62c94749639350200b10370564bb3a
- git.kernel.orgstable/c/ab9cdf1291be551da999510b30216a2886074d7a
- openwall.comlists/oss-security/2026/11/06/9
- xenbits.xen.orgxsa/advisory-526.html
Changes to this CVE
Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).
ReceivedLinux
Description added or changed
New references:- https://git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518
- https://git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6
- https://git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63a
- https://git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02
and 3 more references
Show 9 original changes
Individual changes of this event as published by NVD Type Action Before After Description added —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-2026-100080Affected versions (publisher) added —New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/100xxx/CVE-2026-100080.json">CVE-2026-100080</a>Reference added —https://git.kernel.org/stable/c/36f858f228e3f955b9336af7f94634747c221518Reference added —https://git.kernel.org/stable/c/37d5a73170579b30e67cc8b19ec69715eea3a6b6Reference added —https://git.kernel.org/stable/c/4223b33be49ee09acb6f1d26beb4a36dd3b8d63aReference added —https://git.kernel.org/stable/c/4867687b6ad28ab84bc0811d8f8f9972e769da02Reference added —https://git.kernel.org/stable/c/6cd611d2abdd8623a554e14145f82c1cb4e4467aReference added —https://git.kernel.org/stable/c/89e534265b62c94749639350200b10370564bb3aReference added —https://git.kernel.org/stable/c/ab9cdf1291be551da999510b30216a2886074d7aSource identifier: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Record modifiedCVE Program
Show 2 original changes
Individual changes of this event as published by NVD Type Action Before After Reference added —http://www.openwall.com/lists/oss-security/2026/11/06/9Reference added —http://xenbits.xen.org/xsa/advisory-526.htmlSource identifier: af854a3a-2127-422b-91ae-364da2661108
Embed badge
Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.
<a href="https://intel.neosec.eu/en/cve/CVE-2026-100080"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-100080.svg?lang=en" alt="CVE-2026-100080 – NEOSEC Intel" height="20"></a>