Is CVE-2021-33034 in the CISA KEV catalog?

No. CVE-2021-33034 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-33034?

CVE-2021-33034 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-33034?

CVE-2021-33034 has an EPSS score of 0.82% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-33034?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 117 affected products.

CVE & CISA-KEV Catalog

CVE-2021-33034

HIGH

7.8

CVSS v3

NVD

Description

In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value.

CWE-416Use After Free

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-33034

linuxUbuntu

Fixed in:4.4.0-219.252USN-5299-1

Fixed in:4.4.0-222.255USN-5343-1

Fixed in:4.15.0-151.157USN-5018-1

Fixed in:5.4.0-77.86USN-5000-1

linux-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

Fixed in:4.4.0-1099.104USN-5299-1

Fixed in:4.4.0-1135.149USN-5299-1

Fixed in:4.4.0-1138.152USN-5343-1

Fixed in:4.15.0-1109.116USN-5018-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

linux-aws-5.8Ubuntu

Fixed in:5.8.0-1041.43~20.04.1USN-5016-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1109.116~16.04.1USN-5018-1

linux-azureUbuntu

Fixed in:4.15.0-1121.134~14.04.1USN-5018-1

Fixed in:4.15.0-1121.134~16.04.1USN-5018-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1121.134USN-5018-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

linux-azure-5.8Ubuntu

Fixed in:5.8.0-1039.42~20.04.1USN-5016-1

linux-gcpUbuntu

Fixed in:4.15.0-1106.120~16.04.1USN-5018-1

Fixed in:5.4.0-1046.49USN-5000-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1106.120USN-5018-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1046.49~18.04.1USN-5000-1

linux-gcp-5.8Ubuntu

Fixed in:5.8.0-1038.40~20.04.1USN-5016-1

linux-gkeUbuntu

Fixed in:5.4.0-1046.48USN-5000-1

linux-gke-5.4Ubuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5000-1

linux-gkeopUbuntu

Fixed in:5.4.0-1018.19USN-5000-1

linux-gkeop-5.4Ubuntu

Fixed in:5.4.0-1018.19~18.04.1USN-5000-1

linux-hweUbuntu

Fixed in:4.15.0-151.157~16.04.1USN-5018-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-4.15.0-1078-oracleUbuntu

Fixed in:4.15.0-1078.86~16.04.1USN-5018-1

Fixed in:4.15.0-1078.86USN-5018-1

linux-image-4.15.0-1092-raspi2Ubuntu

Fixed in:4.15.0-1092.98USN-5018-1

linux-image-4.15.0-1097-kvmUbuntu

Fixed in:4.15.0-1097.99USN-5018-1

linux-image-4.15.0-1106-gcpUbuntu

Fixed in:4.15.0-1106.120~16.04.1USN-5018-1

Fixed in:4.15.0-1106.120USN-5018-1

linux-image-4.15.0-1109-awsUbuntu

Fixed in:4.15.0-1109.116~16.04.1USN-5018-1

Fixed in:4.15.0-1109.116USN-5018-1

linux-image-4.15.0-1109-snapdragonUbuntu

Fixed in:4.15.0-1109.118USN-5018-1

linux-image-4.15.0-1121-azureUbuntu

Fixed in:4.15.0-1121.134~14.04.1USN-5018-1

Fixed in:4.15.0-1121.134~16.04.1USN-5018-1

Fixed in:4.15.0-1121.134USN-5018-1

linux-image-4.15.0-151-genericUbuntu

Fixed in:4.15.0-151.157~16.04.1USN-5018-1

Fixed in:4.15.0-151.157USN-5018-1

linux-image-4.15.0-151-generic-lpaeUbuntu

Fixed in:4.15.0-151.157USN-5018-1

linux-image-4.15.0-151-lowlatencyUbuntu

Fixed in:4.15.0-151.157~16.04.1USN-5018-1

Fixed in:4.15.0-151.157USN-5018-1

linux-image-4.4.0-1099-awsUbuntu

Fixed in:4.4.0-1099.104USN-5299-1

linux-image-4.4.0-1100-kvmUbuntu

Fixed in:4.4.0-1100.109USN-5299-1

linux-image-4.4.0-1102-awsUbuntu

Fixed in:4.4.0-1102.107USN-5343-1

linux-image-4.4.0-1103-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

linux-image-4.4.0-1135-awsUbuntu

Fixed in:4.4.0-1135.149USN-5299-1

linux-image-4.4.0-1138-awsUbuntu

Fixed in:4.4.0-1138.152USN-5343-1

linux-image-4.4.0-219-genericUbuntu

Fixed in:4.4.0-219.252~14.04.1USN-5299-1

Fixed in:4.4.0-219.252USN-5299-1

linux-image-4.4.0-219-lowlatencyUbuntu

Fixed in:4.4.0-219.252~14.04.1USN-5299-1

Fixed in:4.4.0-219.252USN-5299-1

linux-image-4.4.0-222-genericUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-4.4.0-222-lowlatencyUbuntu

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

Fixed in:4.4.0-222.255USN-5343-1

linux-image-5.10.0-1033-oemUbuntu

Fixed in:5.10.0-1033.34USN-5001-1

linux-image-5.4.0-1018-gkeopUbuntu

Fixed in:5.4.0-1018.19~18.04.1USN-5000-1

Fixed in:5.4.0-1018.19USN-5000-1

linux-image-5.4.0-1038-raspiUbuntu

Fixed in:5.4.0-1038.41~18.04.1USN-5000-1

Fixed in:5.4.0-1038.41USN-5000-1

linux-image-5.4.0-1041-kvmUbuntu

Fixed in:5.4.0-1041.42USN-5000-2

linux-image-5.4.0-1046-gcpUbuntu

Fixed in:5.4.0-1046.49~18.04.1USN-5000-1

Fixed in:5.4.0-1046.49USN-5000-1

linux-image-5.4.0-1046-gkeUbuntu

Fixed in:5.4.0-1046.48~18.04.1USN-5000-1

Fixed in:5.4.0-1046.48USN-5000-1

linux-image-5.4.0-1048-oracleUbuntu

Fixed in:5.4.0-1048.52~18.04.1USN-5000-1

Fixed in:5.4.0-1048.52USN-5000-1

linux-image-5.4.0-1051-awsUbuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-image-5.4.0-1051-azureUbuntu

Fixed in:5.4.0-1051.53~18.04.1USN-5000-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-image-5.4.0-77-genericUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.4.0-77-generic-lpaeUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.4.0-77-lowlatencyUbuntu

Fixed in:5.4.0-77.86~18.04.1USN-5000-1

Fixed in:5.4.0-77.86USN-5000-1

linux-image-5.8.0-1037-oracleUbuntu

Fixed in:5.8.0-1037.38~20.04.1USN-5016-1

linux-image-5.8.0-1038-gcpUbuntu

Fixed in:5.8.0-1038.40~20.04.1USN-5016-1

linux-image-5.8.0-1039-azureUbuntu

Fixed in:5.8.0-1039.42~20.04.1USN-5016-1

linux-image-5.8.0-1041-awsUbuntu

Fixed in:5.8.0-1041.43~20.04.1USN-5016-1

linux-image-5.8.0-63-genericUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-generic-64kUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-generic-lpaeUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-5.8.0-63-lowlatencyUbuntu

Fixed in:5.8.0-63.71~20.04.1USN-5016-1

linux-image-awsUbuntu

Fixed in:4.4.0.1099.97USN-5299-1

Fixed in:4.4.0.1102.100USN-5343-1

Fixed in:4.4.0.1135.140USN-5299-1

Fixed in:4.4.0.1138.143USN-5343-1

Fixed in:5.4.0.1051.33USN-5000-1

Fixed in:5.8.0.1041.43~20.04.13USN-5016-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1109.100USN-5018-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1109.112USN-5018-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1051.53USN-5000-1

linux-image-azureUbuntu

Fixed in:4.15.0.1121.94USN-5018-1

Fixed in:4.15.0.1121.112USN-5018-1

Fixed in:5.4.0.1051.30USN-5000-1

Fixed in:5.8.0.1039.42~20.04.11USN-5016-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1121.94USN-5018-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1051.49USN-5000-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1106.107USN-5018-1

Fixed in:5.4.0.1046.33USN-5000-1

Fixed in:5.8.0.1038.40~20.04.13USN-5016-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1106.125USN-5018-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-genericUbuntu

Fixed in:4.4.0.219.226USN-5299-1

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.151.139USN-5018-1

Fixed in:5.4.0.77.80USN-5000-1

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

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.151.146USN-5018-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-generic-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.151.139USN-5018-1

Fixed in:5.4.0.77.80USN-5000-1

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

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

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

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-generic-lts-xenialUbuntu

Fixed in:4.4.0.219.190USN-5299-1

Fixed in:4.4.0.222.193USN-5343-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1106.107USN-5018-1

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1046.48~18.04.12USN-5000-1

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-gkeopUbuntu

Fixed in:5.4.0.1018.21USN-5000-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.1018.19~18.04.19USN-5000-1

Fixed in:5.4.0.1018.21USN-5000-1

linux-image-kvmUbuntu

Fixed in:4.4.0.1103.101USN-5343-1

Fixed in:4.4.0.1100.98USN-5299-1

Fixed in:4.15.0.1097.93USN-5018-1

Fixed in:5.4.0.1041.39USN-5000-2

linux-image-lowlatencyUbuntu

Fixed in:4.4.0.219.226USN-5299-1

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.15.0.151.139USN-5018-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.151.146USN-5018-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-lowlatency-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-lowlatency-lts-xenialUbuntu

Fixed in:4.4.0.219.190USN-5299-1

Fixed in:4.4.0.222.193USN-5343-1

linux-image-oemUbuntu

Fixed in:4.15.0.151.146USN-5018-1

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-oem-20.04Ubuntu

Fixed in:5.10.0.1033.34USN-5001-1

linux-image-oem-20.04bUbuntu

Fixed in:5.10.0.1033.34USN-5001-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1078.66USN-5018-1

Fixed in:5.4.0.1048.52~18.04.30USN-5000-1

Fixed in:5.8.0.1037.38~20.04.13USN-5016-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1078.88USN-5018-1

linux-image-oracle-lts-20.04Ubuntu

Fixed in:5.4.0.1048.48USN-5000-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1038.73USN-5000-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1038.40USN-5000-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1092.90USN-5018-1

Fixed in:5.4.0.1038.73USN-5000-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1109.112USN-5018-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-virtualUbuntu

Fixed in:4.4.0.222.229USN-5343-1

Fixed in:4.4.0.219.226USN-5299-1

Fixed in:4.15.0.151.139USN-5018-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.151.146USN-5018-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-virtual-hwe-20.04Ubuntu

Fixed in:5.8.0.63.71~20.04.45USN-5016-1

linux-image-virtual-lts-xenialUbuntu

Fixed in:4.4.0.219.190USN-5299-1

Fixed in:4.4.0.222.193USN-5343-1

linux-kvmUbuntu

Fixed in:4.4.0-1103.112USN-5343-1

Fixed in:4.4.0-1100.109USN-5299-1

Fixed in:4.15.0-1097.99USN-5018-1

Fixed in:5.4.0-1041.42USN-5000-2

linux-lts-xenialUbuntu

Fixed in:4.4.0-219.252~14.04.1USN-5299-1

Fixed in:4.4.0-222.255~14.04.1USN-5343-1

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1033.34USN-5001-1

linux-oracleUbuntu

Fixed in:4.15.0-1078.86~16.04.1USN-5018-1

Fixed in:4.15.0-1078.86USN-5018-1

Fixed in:5.4.0-1048.52USN-5000-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1048.52~18.04.1USN-5000-1

linux-oracle-5.8Ubuntu

Fixed in:5.8.0-1037.38~20.04.1USN-5016-1

linux-raspiUbuntu

Fixed in:5.4.0-1038.41USN-5000-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1038.41~18.04.1USN-5000-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1092.98USN-5018-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1109.118USN-5018-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.82%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Patch2

Exploit2

Third-Party Advisory2

Other references1

lists.fedoraproject.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.