Not rated
CVE-2026-100081 xen-netback: defer xenvif_mcast_addr_list_free()
Description
In the Linux kernel, the following vulnerability has been resolved: xen-netback: defer xenvif_mcast_addr_list_free() In order for the function to legitimately avoid locking/RCU, it needs to run after all TX/RX processing has finished/stopped: Lookups happen from xenvif_start_xmit(), while adds/removes happen from xenvif_tx_action() (called out of xenvif_poll()). Move the call out of xenvif_disconnect_data() (the call to the function from connect()'s error path doesn't require any cleaning up there), and put it past the synchronization point in backend_disconnect(). This is XSA-527 / CVE-2026-100081.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 7.3 | earliest → < 7.3.3 | 7.3.3 |
| Linux 6.18 | earliest → < 6.18.62 | 6.18.62 |
| Linux 6.12 | earliest → < 6.12.116 | 6.12.116 |
| Linux 6.6 | earliest → < 6.6.162 | 6.6.162 |
| Linux 6.1 | earliest → < 6.1.192 | 6.1.192 |
| Linux 5.15 | earliest → < 5.15.225 | 5.15.225 |
| Linux 5.10 | earliest → < 5.10.274 | 5.10.274 |
| Linux | 4.11 | No fix stated |
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