CVE-2021-44733: Debian Linux

High severity, CVSS 7.0. EPSS: 0.7% chance of exploitation in the next 30 days.

A use-after-free exists in drivers/tee/tee_shm.c in the TEE subsystem in the Linux kernel through 5.15.11. This occurs because of a race condition in tee_shm_get_from_id during an attempt to free a shared memory object.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 35 only
• Linux Linux Kernel: from 4.12, before 4.14.261 (fixed in 4.14.261); from 4.15, before 4.19.224 (fixed in 4.19.224); from 4.20, before 5.4.170 (fixed in 5.4.170); from 5.5, before 5.10.89 (fixed in 5.10.89); from 5.11, before 5.15.12 (fixed in 5.15.12)
• 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
• Red Hat Enterprise Linux: version 8.0 only

Published 2021-12-22. Last modified 2026-08-05.