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CVE-2026-11368: The Bluetooth host ATT layer (subsys/bluetooth/host/att.c) associates each in-flight ATT TX buffer with its ow

35
Routine
HIGH 7.1UPGRADE

CVE-2026-11368 is a high-severity flaw (CVSS 7.1) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 it

Why this priority

  • High severity
  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score7.1 (High)
Attack vectorAdjacent network
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 78%)
CISA exploited listNo
WeaknessCWE-416
Published2026-08-04
Last modified2026-10-23
Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Am I affected?

Timeline

zephyrproject zephyr UPGRADE
Affected: >= 4.4.0 and < 4.5.0
Fixed in: 4.5.0
Safe to downgrade to: a release before 4.4.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

References

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