Quick answers
- Is CVE-2026-100081 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100081 being exploited in the wild.
- How severe is CVE-2026-100081?
- Informational severity, published 6 November 2026.
- Which products and versions are affected?
- Linux kernel All versions prior to fix.
- Is there a fix for CVE-2026-100081?
- A patch was published on 2026-11-06. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-100081 attacked?
- It is attacked with local access, in an operating system.
- Am I affected by CVE-2026-100081?
- 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
A use-after-free vulnerability in xen-netback's xenvif_mcast_addr_list_free() function arises because the cleanup was called before TX/RX processing had fully stopped. The lookups from xenvif_start_xmit() and adds/removes from xenvif_tx_action() could access freed memory. The fix defers the cleanup call to backend_disconnect() past the synchronize_net() synchronization point, ensuring all active processing has ceased before memory is freed.
Affected products
- Linux kernel All versions prior to fix
Timeline
- 2026-11-06: disclosed
- 2026-11-06: patched