CVE-2021-38208: linux linux_kernel NULL Pointer Dereference

Modified

AliasesUBUNTU-CVE-2021-38208DEBIAN-CVE-2021-38208

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

Vulnerability summary

CVE-2021-38208 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux linux_kernel. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.3% 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

0.49%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1github

Advisory lineage

Upstream 0 · Downstream 17 · Duplicates 1 · Related 13

DLA-2689-1 DLA-2690-1 MGASA-2021-0257 MGASA-2021-0258 SUSE-SU-2022:1651-1 SUSE-SU-2022:1668-1+12 more

Timeline

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

Description

net/nfc/llcp_sock.c in the Linux kernel before 5.12.10 allows local unprivileged users to cause a denial of service (NULL pointer dereference and BUG) by making a getsockname call after a certain type of failure of a bind call.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.49% 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
Linux
Maturity: poc

Weaknesses

CWE · root cause

CWE-476NULL Pointer DereferenceThe product dereferences a pointer that it expects to be valid but is NULL.

Affected systems

Version check

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

Ubuntu59 products

linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-154.161 | < 5.4.0-81.91
linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1110.117 | < 5.4.0-1055.58
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1016.17~20.04.1
linux-aws-5.3All versions (No fix recorded)

linux-aws-5.4< 5.4.0-1055.58~18.04.1
linux-aws-5.8< 5.8.0-1042.44~20.04.1
linux-aws-fips< 4.15.0-2052.54 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1110.117~16.04.1
linux-azure< 4.15.0-1122.135~14.04.1 | < 4.15.0-1122.135~16.04.1 | All versions (No fix recorded) | < 5.4.0-1056.58
linux-azure-4.15< 4.15.0-1122.135
linux-azure-5.11< 5.11.0-1013.14~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1056.58~18.04.1
linux-azure-5.8< 5.8.0-1040.43~20.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2034.38 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1019.22
linux-dell300x< 4.15.0-1027.32
linux-fips< 4.4.0-1072.78 | All versions (No fix recorded) | < 4.15.0-1068.77 | < 5.4.0-1032.37
linux-gcp< 4.15.0-1107.121~16.04.1 | All versions (No fix recorded) | < 5.4.0-1051.55
linux-gcp-4.15< 4.15.0-1107.121
linux-gcp-5.11< 5.11.0-1017.19~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1051.55~18.04.1
linux-gcp-5.8< 5.8.0-1039.41
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fips< 4.15.0-2017.19 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1051.54
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1051.54~18.04.1
linux-gkeop< 5.4.0-1022.23
linux-gkeop-5.4< 5.4.0-1022.23~18.04.1
linux-hwe< 4.15.0-154.161~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11< 5.11.0-34.36~20.04.1
linux-hwe-5.4< 5.4.0-81.91~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1103.112 | < 4.15.0-1098.100 | < 5.4.0-1045.47
linux-lts-xenial< 4.4.0-222.255~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1038.40
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1079.87~16.04.1 | < 4.15.0-1079.87 | < 5.4.0-1053.57
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1016.17~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1053.57~18.04.1
linux-oracle-5.8< 5.8.0-1038.39~20.04.1
linux-raspi< 5.4.0-1042.46
linux-raspi-5.4< 5.4.0-1042.46~18.04.3
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1094.100 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11< 5.11.0-1017.18~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1111.120