CVE-2021-35039: Debian Linux

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.

Affected products

• Debian Debian Linux: version 9.0 only
• Linux Linux Kernel: from 4.15, before 4.19.196 (fixed in 4.19.196); from 4.20, before 5.4.129 (fixed in 5.4.129); from 5.5, before 5.10.47 (fixed in 5.10.47); from 5.11, before 5.12.14 (fixed in 5.12.14)

Published 2021-07-07. Last modified 2026-06-17.