CVE-2021-3348: Debian Linux

High severity, CVSS 7.0. EPSS: 0.3% chance of exploitation in the next 30 days.

nbd_add_socket in drivers/block/nbd.c in the Linux kernel through 5.10.12 has an ndb_queue_rq use-after-free that could be triggered by local attackers (with access to the nbd device) via an I/O request at a certain point during device setup, aka CID-b98e762e3d71.

Affected products

• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: up to and including 5.10.12

Published 2021-02-01. Last modified 2026-06-17.