CVE-2021-44733: debian debian_linux

Analyzed

AliasesUBUNTU-CVE-2021-44733DEBIAN-CVE-2021-44733

Published 22-12-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-44733 is a high (CVSS 7.0) vulnerability in debian debian_linux. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 54.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?

CVSS score

7.0/10

010

High · v3.1 (NVD)

EPSS score

0.75%

0%100%

Low · +0.04 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1github

Timeline

22-12-2021
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

v3.17.0v2.04.4

EPSS trend

Probability

0.75%

Chance of exploitation in the next 30 days

Percentile

55%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.71% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

githubUnverified
Optee Qemu
Maturity: poc

Weaknesses

CWE · root cause

CWE-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu67 products

linux< 4.15.0-173.182 | < 5.4.0-105.119
linux-aws< 4.15.0-1124.133 | < 5.4.0-1069.73
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)
linux-aws-5.13< 5.13.0-1019.21~20.04.1

linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1069.73~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2064.67 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1124.133~16.04.1
linux-azure< 4.15.0-1134.147~14.04.1 | < 4.15.0-1134.147~16.04.1 | All versions (No fix recorded) | < 5.4.0-1073.76
linux-azure-4.15< 4.15.0-1134.147
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13< 5.13.0-1021.24~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1073.76~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2046.50 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1032.35
linux-dell300x< 4.15.0-1038.43
linux-fips< 4.15.0-1081.90 | All versions (No fix recorded) | < 5.4.0-1046.52
linux-gcp< 4.15.0-1119.133~16.04.1 | All versions (No fix recorded) | < 5.4.0-1068.72
linux-gcp-4.15< 4.15.0-1119.133
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13< 5.13.0-1021.25~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1068.72~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2029.32 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1066.69
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1066.69~18.04.1
linux-gkeop< 5.4.0-1037.38
linux-gkeop-5.4< 5.4.0-1037.38~18.04.1
linux-hwe< 4.15.0-173.182~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13< 5.13.0-37.42~20.04.1
linux-hwe-5.4< 5.4.0-105.119~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1018.20
linux-ibm-5.4< 5.4.0-1018.20~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.15.0-1110.113 | < 5.4.0-1059.62
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14< 5.14.0-1022.24
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1090.99~16.04.1 | < 4.15.0-1090.99 | < 5.4.0-1067.72
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13< 5.13.0-1025.30~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1067.72~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1056.63
linux-raspi-5.4< 5.4.0-1056.63~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1106.113 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1123.132