Xen Linux driver vulnerable to use-after-free in network stats
A use-after-free vulnerability in the Linux xen-netback driver can be triggered by guests during network queue teardown.
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CVE-2026-100080
Use-after-free in Linux kernel xen-netback
- CVSS
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- EPSS
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- Published
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- Modified
AI analysisSummaries by Vani AI
Guest can trigger a use-after-free in the Linux kernel xen-netback driver when reading statistics data during queue teardown after frontend connection error (e.g. illegal Xenstore data). An attacker gains access to freed memory. This affects Linux systems using Xen virtualization.
What to do: Apply Linux kernel update for CVE-2026-100080. No workaround provided.
| Product | Affected |
|---|---|
| Linux kernel | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
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