CVE-2024-49944 sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start
A null pointer dereference in the Linux kernel SCTP module can cause a system crash when autobind fails and port reuse is enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-49944?
CVE-2024-49944 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start
In sctp_listen_start() invoked by sctp_inet_listen(), it should set the sk_state back to CLOSED if sctp_autobind() fails due to whatever reason.
Otherwise, next time when calling sctp_inet_listen(), if sctp_sk(sk)->reuse is already set via setsockopt(SCTP_REUSE_PORT), sctp_sk(sk)->bind_hash will be dereferenced as sk_state is LISTENING, which causes a crash as bind_hash is NULL.
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:sctp_inet_listen+0x7f0/0xa20 net/sctp/socket.c:8617 Call Trace: <TASK> __sys_listen_socket net/socket.c:1883 [inline] __sys_listen+0x1b7/0x230 net/socket.c:1894 __do_sys_listen net/socket.c:1902 [inline]
Which versions are affected by CVE-2024-49944?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-49944?
Apply the vendor's patch.
Is CVE-2024-49944 being exploited?
There is no known exploitation of CVE-2024-49944 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-52914, BELL-CVE-2024-49944, DEBIAN-CVE-2024-49944, GHSA-jww8-jcqp-pmjm, UBUNTU-CVE-2024-49944.