CVE-2026-72334

Bluetooth: ISO: fix malformed ISO_END/CONT handling

State: Published
Severity: 8.8 High
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ccf74f2390d60a2f9a75ef496d2564abb478f46a to before d2df29dc9abda2fc10ff522eac0969f5b77b3637Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 7250b6b5ba9b737cff2c2c1d0760360c7b6bca00Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 49aeb54e3c912ef785311264a51ab9f3698e421bAffected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 5e53e285f8c989662e34d4938c728a94226bff34Affected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 990e65eb9387c4ddfa7f68782b6644c2c35d489fAffected ccf74f2390d60a2f9a75ef496d2564abb478f46a to before e054c1a6ae7310d2815778fddb87da616e11c255Affected
LinuxLinux	6.0Affected before 6.0Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

ccf74f2390d60a2f9a75ef496d2564abb478f46a to before d2df29dc9abda2fc10ff522eac0969f5b77b3637Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 7250b6b5ba9b737cff2c2c1d0760360c7b6bca00Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 49aeb54e3c912ef785311264a51ab9f3698e421bAffected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 5e53e285f8c989662e34d4938c728a94226bff34Affected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before 990e65eb9387c4ddfa7f68782b6644c2c35d489fAffected
ccf74f2390d60a2f9a75ef496d2564abb478f46a to before e054c1a6ae7310d2815778fddb87da616e11c255Affected

LinuxLinux

6.0Affected
before 6.0Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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