CVE-2026-72334
Received Received - Intake

Bluetooth ISO End Packet Handling Flaw in Linux Kernel

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

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.

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Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-72334
EUVD
EUVD-2026-59233

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper handling of malformed Bluetooth ISO packets. The issue occurs when the controller sends incorrect sequences of ISO_START, ISO_CONT, or ISO_END packets, leading to memory leaks or kernel panics. The fix ensures proper validation of packet lengths and combines handling paths to prevent these issues.

Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth ISO handling. Detection requires checking kernel logs for Bluetooth-related errors or panics, particularly involving ISO_START, ISO_CONT, or ISO_END packet handling. Monitor for kernel oops messages or crashes related to bluetoothd or kernel modules.

Impact Analysis

This vulnerability could cause system instability, crashes, or denial of service if exploited. It may also lead to memory leaks, degrading system performance over time. Users relying on Bluetooth ISO protocols could experience disruptions or unexpected behavior.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If immediate patching is not possible, disable Bluetooth ISO functionality temporarily by unloading the relevant kernel modules or disabling Bluetooth ISO in the kernel configuration.

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