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debiancveDebian Security Bug TrackerDEBIANCVE:CVE-2021-23133
HistoryApr 22, 2021 - 6:15 p.m.

CVE-2021-23133

2021-04-2218:15:00
Debian Security Bug Tracker
security-tracker.debian.org
25

0.001 Low

EPSS

Percentile

33.0%

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.