CVE-2021-44733 Information

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.

CVSS Vector

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

Reference

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/tee/tee_shm.c https://lore.kernel.org/lkml/20211215092501.1861229-1-jens.wiklander@linaro.org/ https://github.com/pjlantz/optee-qemu/blob/main/README.md https://security.netapp.com/advisory/ntap-20220114-0003/ https://www.debian.org/security/2022/dsa-5096 https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.0