CVE-2021-38204: debian debian_linux Use After Free

Modified

AliasesUBUNTU-CVE-2021-38204DEBIAN-CVE-2021-38204

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

Vulnerability summary

CVE-2021-38204 is a medium (CVSS 6.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.7% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 6.8, physical access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.8/10

010

Medium · v3.1 (NVD)

EPSS score

0.33%

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

Timeline

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

Description

drivers/usb/host/max3421-hcd.c in the Linux kernel before 5.13.6 allows physically proximate attackers to cause a denial of service (use-after-free and panic) by removing a MAX-3421 USB device in certain situations.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.16.8v2.04.6

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.33% 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

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

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

Ubuntu61 products

linux< 4.4.0-219.252 | < 4.15.0-159.167 | < 5.4.0-88.99
linux-aws< 4.4.0-1099.104 | < 4.4.0-1135.149 | < 4.15.0-1112.119 | < 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< 4.15.0-2054.56 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1112.119~16.04.1
linux-azure< 4.15.0-1124.137~14.04.1 | < 4.15.0-1124.137~16.04.1 | All versions (No fix recorded) | < 5.4.0-1059.62
linux-azure-4.15< 4.15.0-1124.137
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-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2036.40 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1019.22
linux-dell300x< 4.15.0-1028.33
linux-fips< 4.4.0-1069.75 | All versions (No fix recorded) | < 4.15.0-1070.79 | < 5.4.0-1034.40
linux-gcp< 4.15.0-1109.123~16.04.1 | All versions (No fix recorded) | < 5.4.0-1053.57
linux-gcp-4.15< 4.15.0-1109.123
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< 4.15.0-2019.21 | 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< 4.15.0-159.167~16.04.1 | 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< 4.4.0-1100.109 | < 4.15.0-1100.102 | < 5.4.0-1047.49
linux-lts-xenial< 4.4.0-219.252~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1050.52
linux-oem-5.13< 5.13.0-1014.18
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1081.89~16.04.1 | < 4.15.0-1081.89 | < 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< 4.15.0-1096.102 | 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< 4.15.0-1113.122