CVE-2026-100081

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.

• https://git.kernel.org/stable/c/0d515c409033c8e2a645a781be3ca76ab825fc8c
• https://git.kernel.org/stable/c/0e786123e46d08d2247ce93a5435e45ed9f4c5d1
• https://git.kernel.org/stable/c/34f0f63dc6dc11895a17bb5672451b6b11622c99
• https://git.kernel.org/stable/c/96e05a8ce243e2207704e2e7a6e7d1172730f515
• https://git.kernel.org/stable/c/990d123d9eaa3ac6c979eed245658676d65ce0db
• https://git.kernel.org/stable/c/a6bb2f1fa62c56279bdcdadce28d1310c5e12b62
• https://git.kernel.org/stable/c/fb38fc58acb26d74fe8f7b19621fafaae3c040ff
• http://www.openwall.com/lists/oss-security/2026/11/06/10
• http://xenbits.xen.org/xsa/advisory-527.html