UBUNTU-CVE-2021-23133

Advisory lineage Upstream: 1 Downstream: 5
Upstream
CVE-2021-23133
Published: 22 Apr 2021, 18:15
Last modified:03 Jun 2026, 13:34

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7 HIGH
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Apr 2021, 18:15
Published
Vulnerability first disclosed
03 Jun 2026, 13:34
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • ubuntu•linux

    < 4.15.0-147.151 | < 5.4.0-77.86

  • ubuntu•linux-aws

    < 4.15.0-1106.113 | < 5.4.0-1051.53

  • ubuntu•linux-aws-5.0

    all

  • ubuntu•linux-aws-5.3

    all

  • ubuntu•linux-aws-5.4

    < 5.4.0-1051.53~18.04.1

  • ubuntu•linux-aws-5.8

    < 5.8.0-1038.40~20.04.1

  • ubuntu•linux-aws-fips

    < 4.15.0-2048.50 | all | < 5.4.0-1069.73+fips2

  • ubuntu•linux-aws-hwe

    < 4.15.0-1106.113~16.04.1

  • ubuntu•linux-azure

    < 4.15.0-1118.131~14.04.1 | < 4.15.0-1118.131~16.04.1 | all | < 5.4.0-1051.53

  • ubuntu•linux-azure-4.15

    < 4.15.0-1118.131

  • ubuntu•linux-azure-5.3

    all

  • ubuntu•linux-azure-5.4

    < 5.4.0-1051.53~18.04.1

  • ubuntu•linux-azure-5.8

    < 5.8.0-1036.38~20.04.1

  • ubuntu•linux-azure-edge

    all

  • ubuntu•linux-azure-fde-5.19

    all

  • ubuntu•linux-azure-fips

    < 4.15.0-2030.33 | all | < 5.4.0-1073.76+fips1

  • ubuntu•linux-bluefield

    < 5.4.0-1013.16 | all

  • ubuntu•linux-dell300x

    < 4.15.0-1022.26

  • ubuntu•linux-fips

    < 4.15.0-1063.71 | all | < 5.4.0-1028.32

  • ubuntu•linux-gcp

    < 4.15.0-1103.116~16.04.1 | all | < 5.4.0-1046.49

  • ubuntu•linux-gcp-4.15

    < 4.15.0-1103.116

  • ubuntu•linux-gcp-5.3

    all

  • ubuntu•linux-gcp-5.4

    < 5.4.0-1046.49~18.04.1

  • ubuntu•linux-gcp-5.8

    < 5.8.0-1035.37~20.04.1

  • ubuntu•linux-gcp-edge

    all

  • ubuntu•linux-gcp-fips

    all | < 5.4.0-1067.71~20.04.1

  • ubuntu•linux-gke

    < 5.4.0-1046.48

  • ubuntu•linux-gke-4.15

    all

  • ubuntu•linux-gke-5.4

    < 5.4.0-1046.48~18.04.1

  • ubuntu•linux-gkeop

    < 5.4.0-1018.19

  • ubuntu•linux-gkeop-5.4

    < 5.4.0-1018.19~18.04.1

  • ubuntu•linux-hwe

    < 4.15.0-147.151~16.04.1 | all

  • ubuntu•linux-hwe-5.4

    < 5.4.0-77.86~18.04.1

  • ubuntu•linux-hwe-5.8

    < 5.8.0-59.66~20.04.1

  • ubuntu•linux-hwe-edge

    all | all

  • ubuntu•linux-intel-iot-realtime

    all

  • ubuntu•linux-kvm

    < 4.15.0-1094.96 | < 5.4.0-1041.42

  • ubuntu•linux-nvidia

    all

  • ubuntu•linux-oem

    all

  • ubuntu•linux-oem-5.10

    < 5.10.0-1032.33

  • ubuntu•linux-oem-5.6

    all

  • ubuntu•linux-oracle

    < 4.15.0-1075.83~16.04.1 | < 4.15.0-1075.83 | < 5.4.0-1048.52

  • ubuntu•linux-oracle-5.0

    all

  • ubuntu•linux-oracle-5.3

    all

  • ubuntu•linux-oracle-5.4

    < 5.4.0-1048.52~18.04.1

  • ubuntu•linux-oracle-5.8

    < 5.8.0-1033.34~20.04.1

  • ubuntu•linux-raspi

    < 5.4.0-1038.41

  • ubuntu•linux-raspi-5.4

    < 5.4.0-1038.41~18.04.1

  • ubuntu•linux-raspi-realtime

    all

  • ubuntu•linux-raspi2

    < 4.15.0-1089.94 | all

Showing first 50 affected entries in server-rendered view.

References (12)