Quick answers
- Is CVE-2026-100080 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100080 being exploited in the wild.
- How severe is CVE-2026-100080?
- Informational severity, published 6 November 2026.
- Which products and versions are affected?
- Linux Kernel Affected versions across multiple kernel series; fix included in stable trees.
- Is there a fix for CVE-2026-100080?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-100080 attacked?
- It is attacked from the adjacent network, in an operating system.
- Am I affected by CVE-2026-100080?
- Check whether you run Linux Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a use-after-free (UAF) in the xen-netback driver's statistics data handling. Network statistics are protected by RCU synchronization, but during queue teardown following a connection error, the statistics data is freed without calling synchronize_net() to wait for in-flight RCU readers. If sysfs reads the statistics during this window, they access already-freed memory. The fix adds synchronize_net() before queue deinitialization to ensure all RCU readers have completed.
Affected products
- Linux Linux kernel Affected versions across multiple kernel series; fix included in stable trees
Timeline
- 2026-11-06: disclosed