CVE-2021-41864: Debian Linux

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

prealloc_elems_and_freelist in kernel/bpf/stackmap.c in the Linux kernel before 5.14.12 allows unprivileged users to trigger an eBPF multiplication integer overflow with a resultant out-of-bounds write.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 33 only; version 34 only; version 35 only
• Linux Linux Kernel: from 4.6, before 4.9.287 (fixed in 4.9.287); from 4.10, before 4.14.251 (fixed in 4.14.251); from 4.15, before 4.19.211 (fixed in 4.19.211); from 4.20, before 5.4.153 (fixed in 5.4.153); from 5.5, before 5.10.73 (fixed in 5.10.73); from 5.11, before 5.14.12 (fixed in 5.14.12)
• Netapp Cloud Backup: affected versions not specified
• Netapp h300e Firmware: affected versions not specified
• Netapp h300s Firmware: affected versions not specified
• Netapp h410c Firmware: affected versions not specified
• Netapp h410s Firmware: affected versions not specified
• Netapp h500e Firmware: affected versions not specified
• Netapp h500s Firmware: affected versions not specified
• Netapp h700e Firmware: affected versions not specified
• Netapp h700s Firmware: affected versions not specified
• Netapp Hci Management Node: affected versions not specified
• Netapp Solidfire: affected versions not specified
• Netapp Solidfire Baseboard Management Controller Firmware: affected versions not specified

Published 2021-10-02. Last modified 2026-08-05.