CVE-2021-38199: debian debian_linux

Modified

AliasesUBUNTU-CVE-2021-38199DEBIAN-CVE-2021-38199

Published 08-08-2021Last modified 08-10-2026

Vulnerability summary

CVE-2021-38199 is a medium (CVSS 6.5) vulnerability in debian debian_linux. EPSS estimates a 1.24% chance of exploitation in the next 30 days, higher than 69.3% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 6.5, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.5/10

010

Medium · v3.1 (NVD)

EPSS score

1.24%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 8

DLA-2785-1 DLA-2843-1 DSA-4978-1 USN-5091-1 USN-5091-2 USN-5092-1+5 more

Timeline

08-08-2021
PublishedVulnerability first disclosed.
08-10-2026
Last modifiedVulnerability information updated.

Description

fs/nfs/nfs4client.c in the Linux kernel before 5.13.4 has incorrect connection-setup ordering, which allows operators of remote NFSv4 servers to cause a denial of service (hanging of mounts) by arranging for those servers to be unreachable during trunking detection.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.16.5v2.03.3

EPSS trend

Probability

1.24%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.24% 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

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu60 products

linux< 4.15.0-162.170 | < 5.4.0-88.99
linux-aws< 4.15.0-1115.122 | < 5.4.0-1057.60
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1019.20~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1057.60~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2056.58 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1115.122~16.04.1
linux-azure< 4.15.0-1126.139~14.04.1 | < 4.15.0-1126.139~16.04.1 | All versions (No fix recorded) | < 5.4.0-1059.62
linux-azure-4.15< 4.15.0-1126.139
linux-azure-5.11< 5.11.0-1017.18~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1059.62~18.04.1
linux-azure-5.8< 5.8.0-1043.46~20.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2038.42 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1019.22
linux-dell300x< 4.15.0-1030.35
linux-fips< 4.15.0-1072.81 | All versions (No fix recorded) | < 5.4.0-1034.40
linux-gcp< 4.15.0-1111.125~16.04.1 | All versions (No fix recorded) | < 5.4.0-1053.57
linux-gcp-4.15< 4.15.0-1111.125
linux-gcp-5.11< 5.11.0-1020.22~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1053.57~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fips< 4.15.0-2021.23 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1053.56
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1053.56~18.04.1
linux-gkeop< 5.4.0-1024.25
linux-gkeop-5.4< 5.4.0-1024.25~18.04.1
linux-hwe< 4.15.0-162.170~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11< 5.11.0-37.41~20.04.2
linux-hwe-5.4< 5.4.0-87.98~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1005.6
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.15.0-1102.104 | < 5.4.0-1047.49
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1049.51
linux-oem-5.13< 5.13.0-1014.18
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1083.91~16.04.1 | < 4.15.0-1083.91 | < 5.4.0-1055.59
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1019.20~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1055.59~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1044.48
linux-raspi-5.4< 5.4.0-1044.48~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1098.104 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1020.21~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1115.124