CVE-2021-4002: debian debian_linux Incomplete Cleanup

Modified

AliasesUBUNTU-CVE-2021-4002USN-5206-1USN-5211-1+1 more

Published 03-03-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4002 is a medium (CVSS 4.4) Incomplete Cleanup vulnerability in debian debian_linux. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 43.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 4.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

4.4/10

010

Medium · v3.1 (NVD)

EPSS score

0.52%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Timeline

03-03-2022
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.14.4v2.03.6

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.52% 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

referenceUnverified
Exploit Reference (openwall.com)
Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

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

Ubuntu63 products

linux< 3.13.0-189.240 | < 4.4.0-218.251 | < 4.15.0-166.174 | < 5.4.0-92.103
linux-aws< 4.4.0-1098.103 | < 4.4.0-1134.148 | < 4.15.0-1118.125 | < 5.4.0-1061.64
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1023.24~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1061.64~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2059.61 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1118.125~16.04.1
linux-azure< 4.15.0-1129.142~14.04.1 | < 4.15.0-1129.142~16.04.1 | All versions (No fix recorded) | < 5.4.0-1065.68
linux-azure-4.15< 4.15.0-1129.142
linux-azure-5.11< 5.11.0-1023.24~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1065.68~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2041.45 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1023.26
linux-dell300x< 4.15.0-1033.38
linux-fips< 4.4.0-1068.74 | All versions (No fix recorded) | < 4.15.0-1075.84 | < 5.4.0-1038.44
linux-gcp< 4.15.0-1114.128~16.04.1 | All versions (No fix recorded) | < 5.4.0-1059.63
linux-gcp-4.15< 4.15.0-1114.128
linux-gcp-5.11< 5.11.0-1024.26~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1059.63~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2024.26 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1057.60
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1057.60~18.04.1
linux-gkeop< 5.4.0-1029.30
linux-gkeop-5.4< 5.4.0-1029.30~18.04.2
linux-hwe< 4.15.0-166.174~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11< 5.11.0-44.48~20.04.2
linux-hwe-5.13< 5.13.0-23.23~20.04.2
linux-hwe-5.4< 5.4.0-92.103~18.04.2
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1010.11
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1099.108 | < 4.15.0-1105.107 | < 5.4.0-1051.53
linux-lts-xenial< 4.4.0-218.251~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1053.55
linux-oem-5.13< 5.13.0-1026.32
linux-oem-5.14< 5.14.0-1013.13
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1085.93~16.04.1 | < 4.15.0-1085.93 | < 5.4.0-1059.63
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1023.24~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1059.63~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1048.53
linux-raspi-5.4< 5.4.0-1048.53~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1101.108 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1024.25~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1118.127