vulnerability
Red Hat: CVE-2021-23133: CVE-2021-23133 kernel: Race condition in sctp_destroy_sock list_del (Multiple Advisories)
Severity | CVSS | Published | Added | Modified |
---|---|---|---|---|
7 | (AV:L/AC:M/Au:N/C:C/I:C/A:C) | Apr 22, 2021 | Nov 10, 2021 | Jul 9, 2025 |
Severity
7
CVSS
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
Published
Apr 22, 2021
Added
Nov 10, 2021
Modified
Jul 9, 2025
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.
Solution(s)
no-fix-redhat-rpm-packageredhat-upgrade-kernelredhat-upgrade-kernel-rt

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