CVE-2026-11368

Description

The Bluetooth host ATT layer (subsys/bluetooth/host/att.c) associates each in-flight ATT TX buffer with its owning channel via the static tx_meta_data_storage[] array (data->att_chan = chan). When a buffer's last reference is dropped, its net-buf destroy callback defers the completion handling to the system workqueue (att_tx_destroy -> att_tx_destroy_work_handler -> att_on_sent_cb -> bt_att_sent), where bt_att_sent dereferences the channel and its ATT context (sys_slist_get(&att->reqs)). When a peer disconnects while an ATT PDU (a server notification/indication or any response) is still in flight in the controller TX path, L2CAP tears the channel down in l2cap_chan_del(): it runs the disconnected callback and then the released callback (bt_att_released), which frees the channel slab slot. Because the in-flight buffer is held by the connection TX path rather than the channel's own queue, its deferred destroy work can run after the channel has been freed. The att_on_sent_cb guard intended to drop the stale callback itself dereferences meta->att_chan, which is now a dangling pointer into a freed (and possibly reused) slab slot. A remote peer with an ATT connection can drive this by disconnecting during routine ATT traffic; no pairing or user interaction is required to reach the ATT bearer. The result is a use-after-free read/write of freed channel memory, reliably crashing the Bluetooth host (denial of service) and, because the channel slab slot may be reused, potentially corrupting live memory. The fix makes bt_att_released() NULL the att_chan field of every tx_meta_data_storage[] entry still referencing the channel before freeing it, so the deferred guard observes a NULL pointer and drops the callback. Teardown and the destroy work both run on the cooperative system workqueue, so the array update is serialized and needs no lock.

Overview

State: PUBLISHED
Assigner (CNA): zephyr
CVSS severity: HIGH
CVSS score: 7.1 / 10
CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): CWE-416
Reserved: 2026-06-05
Published: 2026-08-04 14:23 UTC
Last updated: 2026-08-04 17:57 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/11xxx/CVE-2026-11368.json
Linked Threat: CVE-2026-11368 — Use-after-free in Bluetooth host ATT TX completion on disconnect mid-transfer

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-52700

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Affected products (1)

Vendor	Product	Versions	Platforms
zephyrproject	zephyr	`4.4.0` (affected)	—

Vendor references (2)

References embedded in the original CVE record by the assigning CNA.

Fix commit patch
GHSA-85vg-gwc4-77g7

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Nvd - Cve-2026-50368

web:nvd.nist.gov

Description Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

2026-08-06 01:18 UTC
Security Update Guide - Microsoft Security Response Center

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-08-06 01:18 UTC
WatchGuard Issues Third Critical IKEv2 Patch in Ten Months as Legacy ...

web:squirrelvpn.com

WatchGuard issues third critical IKEv2 patch in ten months. Learn how CVE - 2026 -13368 affects your Firebox appliances and the risks to legacy hardware.

2026-08-06 01:18 UTC
SAP Security Patch Day - February 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the Support Portal and applies patches on priority to protect their SAP landscape. On 10th of February 2026 , SAP security patch day saw the release of 26 new security notes. Further, there was 1 update to ...

2026-08-06 01:18 UTC
SAP Security Patch Day - June 2026

web:support.sap.com

SAP security Patch Day Bulletin This post shares the information on security notes that remediate vulnerabilities discovered in SAP products. SAP strongly recommends that the customer visits the support portal and applies patches on priority to protect their SAP landscape. On 9th of June 2026 , SAP security patch day saw the release of 15 new security notes.

2026-08-06 01:18 UTC
CVE-2026-50368: Patch AD FS DoS Flaw in July 14 Updates

web:windowsforum.com

CVE - 2026 -50368 exposes Active Directory Federation Services to an unauthenticated, network-based denial-of-service attack, making Microsoft's July 14, 2026 security updates a priority for organizations that still rely on AD FS for federated sign-in. Microsoft rates the vulnerability Important...

2026-08-06 01:18 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-08-06 01:18 UTC
Oracle Critical Security Patch Update Advisory - June 2026

web:www.oracle.com

Additional CVEs addressed are: The patch for CVE - 2026 -34481 also addresses CVE - 2026 -34477, CVE - 2026 -34478, CVE - 2026 -34479, and CVE - 2026 -34480. Oracle Fusion Middleware Risk Matrix This Critical Security Patch Update contains 106 new security patches for Oracle Fusion Middleware. 53 of these vulnerabilities may be remotely exploitable without authentication, i.e., may be exploited over a ...

2026-08-06 01:18 UTC
July 2026 Patch Tuesday: Largest Patch Tuesday 569 CVEs - Tenable

web:www.tenable.com

Microsoft patched 569 CVEs in July 2026 , the largest Patch Tuesday release in its history. 56 critical CVEs patched including three zero-day vulnerabilities.

2026-08-06 01:18 UTC
Patch Tuesday August 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's August 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-08-06 01:18 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-11368.json.

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