CVE-2021-43389: debian debian_linux Out-of-bounds Read

Modified

AliasesUBUNTU-CVE-2021-43389DEBIAN-CVE-2021-43389

Published 04-11-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-43389 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.9% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

5.5/10

010

Medium · v3.1 (NVD)

EPSS score

0.72%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Timeline

04-11-2021
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

An issue was discovered in the Linux kernel before 5.14.15. There is an array-index-out-of-bounds flaw in the detach_capi_ctr function in drivers/isdn/capi/kcapi.c.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.72% 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 (seclists.org)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.

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

linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-166.174 | < 5.4.0-92.103
linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 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< 4.4.0-1072.78 | 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< 4.4.0-1103.112 | < 4.15.0-1105.107 | < 5.4.0-1051.53
linux-lts-xenial< 4.4.0-222.255~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1051.53
linux-oem-5.13< 5.13.0-1026.32
linux-oem-5.14< 5.14.0-1008.8
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