CVE-2021-44733

Public Exploit

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.

Category

7.0
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.20%
Vendor Advisory debian.org Vendor Advisory kernel.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/tee/tee_shm.c vendor advisory
https://lore.kernel.org/lkml/20211215092501.1861229-1-jens.wiklander%40linaro.org/
https://github.com/pjlantz/optee-qemu/blob/main/README.md third party advisory exploit
https://security.netapp.com/advisory/ntap-20220114-0003/ third party advisory
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html third party advisory mailing list
https://www.debian.org/security/2022/dsa-5096 third party advisory vendor advisory
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dfd0743f1d9ea76931510ed150334d571fbab49d

Frequently Asked Questions

What is the severity of CVE-2021-44733?
CVE-2021-44733 has been scored as a high severity vulnerability.
How to fix CVE-2021-44733?
To fix CVE-2021-44733, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-44733 being actively exploited in the wild?
It is possible that CVE-2021-44733 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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