CVE-2021-23133

CVE Details

Release Date:

2021-04-22

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.

See more information about CVE-2021-23133 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	7	Base Metrics:	AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Access Vector:	Local network	Attack Complexity:	High
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	High
Integrity Impact:	High	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2021-9306	2021-06-15
Oracle Linux version 7 (kernel-uek)	ELSA-2021-9349	2021-07-12
Oracle Linux version 7 (kernel-uek)	ELSA-2021-9362	2021-07-16
Oracle Linux version 7 (kernel-uek-container)	ELSA-2021-9307	2021-06-15
Oracle Linux version 7 (kernel-uek-container)	ELSA-2021-9351	2021-07-12
Oracle Linux version 7 (kernel-uek-container)	ELSA-2021-9363	2021-07-16
Oracle Linux version 8 (kernel)	ELSA-2021-4356	2021-11-16
Oracle Linux version 8 (kernel-uek)	ELSA-2021-9306	2021-06-15
Oracle Linux version 8 (kernel-uek)	ELSA-2021-9362	2021-07-16
Oracle Linux version 8 (kernel-uek-container)	ELSA-2021-9307	2021-06-15
Oracle Linux version 8 (kernel-uek-container)	ELSA-2021-9363	2021-07-16

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team