Is CVE-2021-23133 in the CISA KEV catalog?

No. CVE-2021-23133 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23133?

CVE-2021-23133 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2021-23133?

CVE-2021-23133 has an EPSS score of 0.48% (38th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23133?

Upgrade linux on debian 11 to 5.10.38-1 or later. Fixes are available for 105 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23133

MEDIUM

6.7

CVSS v3

NVD

Description

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

CWE-362Race Condition

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.38-1CVE-2021-23133

linuxUbuntu

Fixed in:4.15.0-147.151USN-5003-1

Fixed in:5.4.0-77.86USN-5000-1

linux-awsUbuntu

Fixed in:4.15.0-1106.113USN-5003-1

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:5.8.0-1038.40~20.04.1USN-4999-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1106.113~16.04.1USN-5003-1

linux-azureUbuntu

Fixed in:4.15.0-1118.131~14.04.1USN-5003-1

Fixed in:4.15.0-1118.131~16.04.1USN-5003-1

Fixed in:5.4.0-1051.53USN-5000-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1118.131USN-5003-1

linux-azure-5.4Ubuntu

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

linux-azure-5.8Ubuntu

Fixed in:5.8.0-1036.38~20.04.1USN-4999-1

linux-dell300xUbuntu

Fixed in:4.15.0-1022.26USN-5003-1

linux-gcpUbuntu

Fixed in:4.15.0-1103.116~16.04.1USN-5003-1

Fixed in:5.4.0-1046.49USN-5000-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1103.116USN-5003-1

linux-gcp-5.4Ubuntu

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

linux-gcp-5.8Ubuntu

Fixed in:5.8.0-1035.37~20.04.1USN-4999-1

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:4.15.0-147.151~16.04.1USN-5003-1

linux-hwe-5.4Ubuntu

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

linux-hwe-5.8Ubuntu

Fixed in:5.8.0-59.66~20.04.1USN-4999-1

linux-image-4.15.0-1022-dell300xUbuntu

Fixed in:4.15.0-1022.26USN-5003-1

linux-image-4.15.0-1075-oracleUbuntu

Fixed in:4.15.0-1075.83~16.04.1USN-5003-1

Fixed in:4.15.0-1075.83USN-5003-1

linux-image-4.15.0-1089-raspi2Ubuntu

Fixed in:4.15.0-1089.94USN-5003-1

linux-image-4.15.0-1103-gcpUbuntu

Fixed in:4.15.0-1103.116~16.04.1USN-5003-1

Fixed in:4.15.0-1103.116USN-5003-1

linux-image-4.15.0-1106-awsUbuntu

Fixed in:4.15.0-1106.113~16.04.1USN-5003-1

Fixed in:4.15.0-1106.113USN-5003-1

linux-image-4.15.0-1106-snapdragonUbuntu

Fixed in:4.15.0-1106.115USN-5003-1

linux-image-4.15.0-1118-azureUbuntu

Fixed in:4.15.0-1118.131~14.04.1USN-5003-1

Fixed in:4.15.0-1118.131~16.04.1USN-5003-1

Fixed in:4.15.0-1118.131USN-5003-1

linux-image-4.15.0-147-genericUbuntu

Fixed in:4.15.0-147.151~16.04.1USN-5003-1

Fixed in:4.15.0-147.151USN-5003-1

linux-image-4.15.0-147-generic-lpaeUbuntu

Fixed in:4.15.0-147.151USN-5003-1

linux-image-4.15.0-147-lowlatencyUbuntu

Fixed in:4.15.0-147.151~16.04.1USN-5003-1

Fixed in:4.15.0-147.151USN-5003-1

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-5.8.0-1033-oracleUbuntu

Fixed in:5.8.0-1033.34~20.04.1USN-4999-1

linux-image-5.8.0-1035-gcpUbuntu

Fixed in:5.8.0-1035.37~20.04.1USN-4999-1

linux-image-5.8.0-1036-azureUbuntu

Fixed in:5.8.0-1036.38~20.04.1USN-4999-1

linux-image-5.8.0-1038-awsUbuntu

Fixed in:5.8.0-1038.40~20.04.1USN-4999-1

linux-image-5.8.0-59-genericUbuntu

Fixed in:5.8.0-59.66~20.04.1USN-4999-1

linux-image-5.8.0-59-generic-64kUbuntu

Fixed in:5.8.0-59.66~20.04.1USN-4999-1

linux-image-5.8.0-59-generic-lpaeUbuntu

Fixed in:5.8.0-59.66~20.04.1USN-4999-1

linux-image-5.8.0-59-lowlatencyUbuntu

Fixed in:5.8.0-59.66~20.04.1USN-4999-1

linux-image-awsUbuntu

Fixed in:5.4.0.1051.33USN-5000-1

Fixed in:5.8.0.1038.40~20.04.11USN-4999-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1106.97USN-5003-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1106.109USN-5003-1

linux-image-aws-lts-20.04Ubuntu

Fixed in:5.4.0.1051.53USN-5000-1

linux-image-azureUbuntu

Fixed in:4.15.0.1118.91USN-5003-1

Fixed in:4.15.0.1118.109USN-5003-1

Fixed in:5.4.0.1051.30USN-5000-1

Fixed in:5.8.0.1036.38~20.04.8USN-4999-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1118.91USN-5003-1

linux-image-azure-lts-20.04Ubuntu

Fixed in:5.4.0.1051.49USN-5000-1

linux-image-dell300xUbuntu

Fixed in:4.15.0.1022.24USN-5003-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1103.104USN-5003-1

Fixed in:5.4.0.1046.33USN-5000-1

Fixed in:5.8.0.1035.37~20.04.9USN-4999-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1103.121USN-5003-1

linux-image-gcp-lts-20.04Ubuntu

Fixed in:5.4.0.1046.55USN-5000-1

linux-image-genericUbuntu

Fixed in:4.15.0.147.134USN-5003-1

Fixed in:5.4.0.77.80USN-5000-1

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

Fixed in:5.8.0.59.66~20.04.42USN-4999-1

linux-image-generic-hwe-16.04Ubuntu

Fixed in:4.15.0.147.143USN-5003-1

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:5.8.0.59.66~20.04.42USN-4999-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.147.134USN-5003-1

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:5.8.0.59.66~20.04.42USN-4999-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1103.104USN-5003-1

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:5.4.0.1041.39USN-5000-2

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.147.134USN-5003-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-lowlatency-hwe-16.04Ubuntu

Fixed in:4.15.0.147.143USN-5003-1

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:5.8.0.59.66~20.04.42USN-4999-1

linux-image-oemUbuntu

Fixed in:4.15.0.147.143USN-5003-1

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:4.15.0.1075.63USN-5003-1

Fixed in:5.4.0.1048.52~18.04.30USN-5000-1

Fixed in:5.8.0.1033.34~20.04.9USN-4999-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1075.85USN-5003-1

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:4.15.0.1089.86USN-5003-1

Fixed in:5.4.0.1038.73USN-5000-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1106.109USN-5003-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.77.86~18.04.69USN-5000-1

linux-image-virtualUbuntu

Fixed in:4.15.0.147.134USN-5003-1

Fixed in:5.4.0.77.80USN-5000-1

linux-image-virtual-hwe-16.04Ubuntu

Fixed in:4.15.0.147.143USN-5003-1

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:5.8.0.59.66~20.04.42USN-4999-1

linux-kvmUbuntu

Fixed in:5.4.0-1041.42USN-5000-2

linux-oem-5.10Ubuntu

Fixed in:5.10.0-1033.34USN-5001-1

linux-oracleUbuntu

Fixed in:4.15.0-1075.83~16.04.1USN-5003-1

Fixed in:4.15.0-1075.83USN-5003-1

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:5.8.0-1033.34~20.04.1USN-4999-1

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:4.15.0-1089.94USN-5003-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1106.115USN-5003-1

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 RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.48%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Patch6

Mitigation2

Third-Party Advisory1

security.netapp.com

Other references3

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	KEV	Fix

Embed a live status badge for CVE-2021-23133

Markdown

[![CVE-2021-23133](https://tridentstack.com/cve/badge/CVE-2021-23133.svg)](https://tridentstack.com/cve/CVE-2021-23133)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-23133"><img src="https://tridentstack.com/cve/badge/CVE-2021-23133.svg" alt="CVE-2021-23133"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.