CVE-2021-23133 Linux Kernel sctp_destroy_sock race condition
A race condition in Linux Kernel SCTP sockets allows local attackers to escalate privileges to root via improper locking in sctp_destroy_sock.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-23133?
CVE-2021-23133 is a medium-severity vulnerability in Debian Debian Linux, published on 22 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2021-23133?
It affects 15 products.
Linux distribution packages (6)
kgraft-patch-SLE12-SP5_Update_17 SUSE:Linux Enterprise Live Patching 12 SP5 | All versions | 4-2.2 |
kgraft-patch-SLE12-SP5_Update_18 SUSE:Linux Enterprise Live Patching 12 SP5 | All versions | 3-2.1 |
kernel-livepatch-SLE15-SP2_Update_11 SUSE:Linux Enterprise Live Patching 15 SP2 | All versions | 6-2.2 |
kernel-livepatch-SLE15-SP2_Update_12 SUSE:Linux Enterprise Live Patching 15 SP2 | All versions | 3-2.1 |
kernel-livepatch-SLE15-SP2_Update_13 SUSE:Linux Enterprise Live Patching 15 SP2 | All versions | 3-2.1 |
kernel-livepatch-SLE15-SP3_Update_0 SUSE:Linux Enterprise Live Patching 15 SP3 | All versions | 3-3.1 |
Products include Broadcom Brocade Fabric Operating System, Debian Debian Linux, Fedoraproject Fedora, Linux kernel, Netapp Cloud Backup, Netapp H300e Firmware and 9 more.
How do I fix CVE-2021-23133?
Apply the vendor's patch.
Is CVE-2021-23133 being exploited?
There is no known exploitation of CVE-2021-23133 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
- CVE-2023-31432 Privilege issues in multiple commands
- CVE-2023-31926 Arbitrary File Overwrite using less command
- CVE-2023-31928 XSS vulnerability in Brocade Webtools
- CVE-2023-31428 CLI allows upload or transfer files of dangerous types
- CVE-2023-31430 buffer overflow vulnerability in “secpolicydelete” command
Sources
Also known as AZL-6530, DEBIAN-CVE-2021-23133, GHSA-hp5q-cmxv-w64v, SUSE-SU-2021:2366-1, SUSE-SU-2021:2384-1, SUSE-SU-2021:2460-1 and 1 more.