CVE-2026-43022: Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-01 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: hci_cmd_sync_queue_once() return -EEXIST if exists hci_cmd_sync_queue_once() needs to indicate whether a queue item was added, so caller can know if callbacks are called, so it can avoid leaking resources. Change the function to return -EEXIST if queue item already exists. Modify all callsites to handle that.

Affected products

Linux kernel: from 6.9 before 6.19.12; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5, 7.0-rc6; 6.1.120, 6.6.51, 6.8.9 (and their updates) — fixed in 6.19.12
Linux: from 6.1.120 before 6.1.191; from 6.6.51 before 6.6.160; from 6.8.9 before 6.9 — fixed in 6.1.191, 6.6.160, 6.9

How to fix

Upgrade to a fixed version: Linux kernel 6.19.12; Linux 6.1.191, 6.6.160, 6.9. Check the vendor advisory for mitigations.

References

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