Vulnerability in Linux Kernel
CVE-2021-44733
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/tee/tee_… (Vendor Advisory)
- lore.kernel.org/lkml/20211215092501.1861229-1-jens.wiklander@linaro.org/ (Third Party Advisory)
- github.com/pjlantz/optee-qemu/blob/main/README.md (Exploit, Third Party Advisory)
- security.netapp.com/advisory/ntap-20220114-0003/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2022/03/msg00012.html (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2022/dsa-5096 (vendor-advisory, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch)
Frequently asked questions
- What is CVE-2021-44733?
- CVE-2021-44733 is a high-severity vulnerability in Linux Kernel, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.0/10. Published 2021-12-22.
- How severe is CVE-2021-44733?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2021-44733 known to be exploited?
- 24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.