Detections
Analytics

CVE-2021-44733

high

Description

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.

References

https://www.debian.org/security/2022/dsa-5096

https://security.netapp.com/advisory/ntap-20220114-0003/

https://lore.kernel.org/lkml/20211215092501.1861229-1-jens.wiklander%40linaro.org/

https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html

https://github.com/pjlantz/optee-qemu/blob/main/README.md

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/tee/tee_shm.c

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dfd0743f1d9ea76931510ed150334d571fbab49d

Details

Source: Mitre, NVD

Published: 2021-12-22

Updated: 2026-08-05

Risk Information

CVSS v2

Base Score: 4.4

Vector: CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 7

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.00208