CVE-2023-53372 sctp: fix a potential overflow in sctp_ifwdtsn_skip

What is CVE-2023-53372?

CVE-2023-53372 is a high-severity vulnerability in Linux kernel, published on 18 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix a potential overflow in sctp_ifwdtsn_skip

Currently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only checks the pos against the end of the chunk. However, the data left for the last pos may be < sizeof(struct sctp_ifwdtsn_skip), and dereference it as struct sctp_ifwdtsn_skip may cause coverflow.

This patch fixes it by checking the pos against "the end of the chunk - sizeof(struct sctp_ifwdtsn_skip)" in sctp_ifwdtsn_skip, similar to sctp_fwdtsn_skip.

Weakness: CWE-787

Which versions are affected by CVE-2023-53372?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53372?

Apply the vendor's patch.

Is CVE-2023-53372 being exploited?

There is no known exploitation of CVE-2023-53372 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2023-53372, DEBIAN-CVE-2023-53372, GHSA-5p9g-wpq2-jmm7, UBUNTU-CVE-2023-53372.