Is CVE-2021-3752 in the CISA KEV catalog?

No. CVE-2021-3752 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3752?

CVE-2021-3752 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-3752?

CVE-2021-3752 has an EPSS score of 1.74% (75th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3752?

Upgrade linux on debian 11 to 5.10.84-1 or later. Fixes are available for 118 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3752

HIGHEPSS 75th pctl

7.1

CVSS v3

NVD

Description

A use-after-free flaw was found in the Linux kernel’s Bluetooth subsystem in the way user calls connect to the socket and disconnect simultaneously due to a race condition. This flaw allows a user to crash the system or escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE-416Use After Free CWE-362Race Condition

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.84-1CVE-2021-3752

Fixed in:5.15.3-1CVE-2021-3752

linuxUbuntu

Fixed in:4.15.0-167.175USN-5268-1

Fixed in:5.4.0-97.110USN-5267-1

linux-awsUbuntu

Fixed in:4.4.0-1109.115USN-5513-1

Fixed in:4.15.0-1119.127USN-5268-1

Fixed in:5.4.0-1064.67USN-5267-1

linux-aws-5.11Ubuntu

Fixed in:5.11.0-1028.31~20.04.1USN-5265-1

linux-aws-5.13Ubuntu

Fixed in:5.13.0-1012.13~20.04.1USN-5265-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1064.67~18.04.1USN-5267-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1119.126~16.04.2USN-5268-1

linux-azureUbuntu

Fixed in:4.15.0-1130.143~14.04.1USN-5268-1

Fixed in:4.15.0-1130.143~16.04.1USN-5268-1

Fixed in:5.4.0-1068.71USN-5267-1

linux-azure-5.11Ubuntu

Fixed in:5.11.0-1028.31~20.04.2USN-5265-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1068.71~18.04.1USN-5267-1

linux-bluefieldUbuntu

Fixed in:5.4.0-1026.29USN-5267-1

linux-dell300xUbuntu

Fixed in:4.15.0-1034.39USN-5268-1

linux-gcpUbuntu

Fixed in:4.15.0-1115.129~16.04.1USN-5268-1

Fixed in:5.4.0-1063.67USN-5267-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1115.129USN-5268-1

linux-gcp-5.11Ubuntu

Fixed in:5.11.0-1029.33~20.04.3USN-5265-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1063.67~18.04.1USN-5267-1

linux-gkeopUbuntu

Fixed in:5.4.0-1032.33USN-5267-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1032.33~18.04.1USN-5267-1

linux-hweUbuntu

Fixed in:4.15.0-167.175~16.04.1USN-5268-1

linux-hwe-5.13Ubuntu

Fixed in:5.13.0-28.31~20.04.1USN-5265-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-97.110~18.04.1USN-5267-1

linux-ibmUbuntu

Fixed in:5.4.0-1013.14USN-5267-1

linux-image-4.15.0-1034-dell300xUbuntu

Fixed in:4.15.0-1034.39USN-5268-1

linux-image-4.15.0-1086-oracleUbuntu

Fixed in:4.15.0-1086.94~16.04.1USN-5268-1

Fixed in:4.15.0-1086.94USN-5268-1

linux-image-4.15.0-1102-raspi2Ubuntu

Fixed in:4.15.0-1102.109USN-5268-1

linux-image-4.15.0-1106-kvmUbuntu

Fixed in:4.15.0-1106.108USN-5268-1

linux-image-4.15.0-1115-gcpUbuntu

Fixed in:4.15.0-1115.129~16.04.1USN-5268-1

Fixed in:4.15.0-1115.129USN-5268-1

linux-image-4.15.0-1119-snapdragonUbuntu

Fixed in:4.15.0-1119.128USN-5268-1

linux-image-4.15.0-1130-azureUbuntu

Fixed in:4.15.0-1130.143~14.04.1USN-5268-1

Fixed in:4.15.0-1130.143~16.04.1USN-5268-1

linux-image-4.15.0-167-genericUbuntu

Fixed in:4.15.0-167.175~16.04.1USN-5268-1

Fixed in:4.15.0-167.175USN-5268-1

linux-image-4.15.0-167-generic-lpaeUbuntu

Fixed in:4.15.0-167.175USN-5268-1

linux-image-4.15.0-167-lowlatencyUbuntu

Fixed in:4.15.0-167.175~16.04.1USN-5268-1

Fixed in:4.15.0-167.175USN-5268-1

linux-image-4.4.0-1109-awsUbuntu

Fixed in:4.4.0-1109.115USN-5513-1

linux-image-4.4.0-1110-kvmUbuntu

Fixed in:4.4.0-1110.120USN-5505-1

linux-image-4.4.0-229-genericUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

linux-image-4.4.0-229-lowlatencyUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

linux-image-5.11.0-1028-azureUbuntu

Fixed in:5.11.0-1028.31~20.04.2USN-5265-1

linux-image-5.11.0-1028-oracleUbuntu

Fixed in:5.11.0-1028.31~20.04.1USN-5265-1

linux-image-5.11.0-1029-gcpUbuntu

Fixed in:5.11.0-1029.33~20.04.3USN-5265-1

linux-image-5.13.0-1029-oemUbuntu

Fixed in:5.13.0-1029.36USN-5265-1

linux-image-5.13.0-28-genericUbuntu

Fixed in:5.13.0-28.31~20.04.1USN-5265-1

linux-image-5.13.0-28-generic-64kUbuntu

Fixed in:5.13.0-28.31~20.04.1USN-5265-1

linux-image-5.13.0-28-generic-lpaeUbuntu

Fixed in:5.13.0-28.31~20.04.1USN-5265-1

linux-image-5.13.0-28-lowlatencyUbuntu

Fixed in:5.13.0-28.31~20.04.1USN-5265-1

linux-image-5.4.0-1013-ibmUbuntu

Fixed in:5.4.0-1013.14USN-5267-1

linux-image-5.4.0-1026-bluefieldUbuntu

Fixed in:5.4.0-1026.29USN-5267-1

linux-image-5.4.0-1032-gkeopUbuntu

Fixed in:5.4.0-1032.33~18.04.1USN-5267-1

Fixed in:5.4.0-1032.33USN-5267-1

linux-image-5.4.0-1052-raspiUbuntu

Fixed in:5.4.0-1052.58~18.04.1USN-5267-3

Fixed in:5.4.0-1052.58USN-5267-3

linux-image-5.4.0-1054-kvmUbuntu

Fixed in:5.4.0-1054.56USN-5267-1

linux-image-5.4.0-1062-oracleUbuntu

Fixed in:5.4.0-1062.66~18.04.1USN-5267-1

Fixed in:5.4.0-1062.66USN-5267-1

linux-image-5.4.0-1063-gcpUbuntu

Fixed in:5.4.0-1063.67~18.04.1USN-5267-1

Fixed in:5.4.0-1063.67USN-5267-1

linux-image-5.4.0-1064-awsUbuntu

Fixed in:5.4.0-1064.67USN-5267-1

linux-image-5.4.0-1068-azureUbuntu

Fixed in:5.4.0-1068.71~18.04.1USN-5267-1

Fixed in:5.4.0-1068.71USN-5267-1

linux-image-5.4.0-97-genericUbuntu

Fixed in:5.4.0-97.110~18.04.1USN-5267-1

Fixed in:5.4.0-97.110USN-5267-1

linux-image-5.4.0-97-generic-lpaeUbuntu

Fixed in:5.4.0-97.110~18.04.1USN-5267-1

Fixed in:5.4.0-97.110USN-5267-1

linux-image-5.4.0-97-lowlatencyUbuntu

Fixed in:5.4.0-97.110~18.04.1USN-5267-1

Fixed in:5.4.0-97.110USN-5267-1

linux-image-awsUbuntu

Fixed in:4.4.0.1109.106USN-5513-1

Fixed in:5.4.0.1064.46USN-5267-1

Fixed in:5.11.0.1028.31~20.04.26USN-5265-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1119.110USN-5268-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1119.122USN-5268-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1064.66USN-5267-1

linux-image-azureUbuntu

Fixed in:4.15.0.1130.103USN-5268-1

Fixed in:4.15.0.1130.121USN-5268-1

Fixed in:5.4.0.1068.47USN-5267-1

Fixed in:5.11.0.1028.31~20.04.26USN-5265-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1068.66USN-5267-1

linux-image-bluefieldUbuntu

Fixed in:5.4.0.1026.27USN-5267-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1034.36USN-5268-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1115.116USN-5268-1

Fixed in:5.4.0.1063.48USN-5267-1

Fixed in:5.11.0.1029.33~20.04.27USN-5265-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1115.134USN-5268-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1063.73USN-5267-1

linux-image-genericUbuntu

Fixed in:4.15.0.167.156USN-5268-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-64k-hwe-20.04Ubuntu

Fixed in:5.13.0.28.31~20.04.15USN-5265-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.167.159USN-5268-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-hwe-18.04-edgeUbuntu

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.13.0.28.31~20.04.15USN-5265-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.167.156USN-5268-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-lpae-hwe-18.04-edgeUbuntu

Fixed in:5.4.0.97.101USN-5267-1

linux-image-generic-lpae-hwe-20.04Ubuntu

Fixed in:5.13.0.28.31~20.04.15USN-5265-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1115.116USN-5268-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1032.35USN-5267-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1032.33~18.04.32USN-5267-1

Fixed in:5.4.0.1032.35USN-5267-1

linux-image-ibmUbuntu

Fixed in:5.4.0.1013.14USN-5267-1

linux-image-ibm-lts-20.04Ubuntu

Fixed in:5.4.0.1013.14USN-5267-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1110.107USN-5505-1

Fixed in:4.15.0.1106.102USN-5268-1

Fixed in:5.4.0.1054.53USN-5267-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.167.156USN-5268-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.167.159USN-5268-1

linux-image-lowlatency-hwe-16.04-edgeUbuntu

Fixed in:4.15.0.167.159USN-5268-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-lowlatency-hwe-18.04-edgeUbuntu

Fixed in:5.4.0.97.101USN-5267-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.13.0.28.31~20.04.15USN-5265-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-image-oemUbuntu

Fixed in:4.15.0.167.159USN-5268-1

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-oem-20.04cUbuntu

Fixed in:5.13.0.1029.31USN-5265-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1086.74USN-5268-1

Fixed in:5.4.0.1062.66~18.04.41USN-5267-1

Fixed in:5.11.0.1028.31~20.04.20USN-5265-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1086.96USN-5268-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1062.62USN-5267-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1052.86USN-5267-3

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1052.54USN-5267-3

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1102.100USN-5268-1

Fixed in:5.4.0.1052.86USN-5267-3

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1119.122USN-5268-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

linux-image-virtualUbuntu

Fixed in:4.15.0.167.156USN-5268-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.167.159USN-5268-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.97.110~18.04.85USN-5267-1

Fixed in:5.4.0.97.101USN-5267-1

linux-image-virtual-hwe-18.04-edgeUbuntu

Fixed in:5.4.0.97.101USN-5267-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.13.0.28.31~20.04.15USN-5265-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.229.199USN-5505-1

linux-kvmUbuntu

Fixed in:4.4.0-1110.120USN-5505-1

Fixed in:4.15.0-1106.108USN-5268-1

Fixed in:5.4.0-1054.56USN-5267-1

linux-lts-xenialUbuntu

Fixed in:4.4.0-229.263~14.04.1USN-5505-1

linux-oem-5.13Ubuntu

Fixed in:5.13.0-1029.36USN-5265-1

linux-oracleUbuntu

Fixed in:4.15.0-1086.94~16.04.1USN-5268-1

Fixed in:4.15.0-1086.94USN-5268-1

Fixed in:5.4.0-1062.66USN-5267-1

linux-oracle-5.11Ubuntu

Fixed in:5.11.0-1028.31~20.04.1USN-5265-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1062.66~18.04.1USN-5267-1

linux-raspiUbuntu

Fixed in:5.4.0-1052.58USN-5267-3

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1052.58~18.04.1USN-5267-3

linux-raspi2Ubuntu

Fixed in:4.15.0-1102.109USN-5268-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1119.128USN-5268-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.74%probability of exploitation in 30 days

75thpercentile

Elevated risk: more likely to be exploited than 75% of all known CVEs.

References

Patch1

oracle.com

Exploit1

openwall.com

Third-Party Advisory5

Other references1

lore.kernel.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.