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7.8
HIGH CVSS 3.1
CVE-2026-68189
Bluetooth: hci_sync: Protect UUID list traversal
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Protect UUID list traversal The hci_sync conversion moved class-of-device and EIR generation from an HCI request built under hdev->lock to asynchronous command sync work. The worker holds hdev->req_lock, but that lock does not serialize access to hdev->uuids against add_uuid() and remove_uuid(), which update the list under hdev->lock. The following interleaving can therefore occur: CPU0 (command sync work) CPU1 (management socket) fetch uuid from the list list_del(&uuid->list) kfree(uuid) read uuid->size KASAN reports the resulting use-after-free: BUG: KASAN: slab-use-after-free in eir_create+0xb8f/0xee0 Read of size 1 at addr ffff88810dbd8620 by task kworker/u17:0/87 Workqueue: hci0 hci_cmd_sync_work Call Trace: eir_create+0xb8f/0xee0 hci_update_eir_sync+0x1c0/0x330 hci_cmd_sync_work+0x13c/0x290 process_one_work+0x63a/0x1070 worker_thread+0x45b/0xd10 Allocated by task 86: __kasan_kmalloc+0x8f/0xa0 add_uuid+0x18a/0x4b0 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 92: __kasan_slab_free+0x43/0x70 kfree+0x131/0x3c0 remove_uuid+0x25e/0x560 hci_sock_sendmsg+0x1033/0x1ea0 Hold hdev->lock while generating and committing the class-of-device and EIR snapshots. Release it before sending an HCI command, so controller waits do not happen under the device lock. This protects all UUID list walks in these paths and restores the serialization lost in the command sync conversion.

Details
INFO

Published Date :

Aug. 10, 2026, 1:20 p.m.

Last Modified :

Aug. 17, 2026, 5:18 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-68189 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Protect UUID list traversal by holding the device lock during data snapshots.
  • Hold device lock during data snapshot.
  • Release lock before sending HCI command.
  • Update Bluetooth HCI sync logic.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-68189.

URL Resource
https://git.kernel.org/stable/c/a351f68fb24828b23a971e00b8238ee0e8a40380
https://git.kernel.org/stable/c/a42f5536ea9c00e13f0c0fbb330feed95e2365ca
https://git.kernel.org/stable/c/e4fa2c5c261d736b8e58759fdef3a968d510630c
https://git.kernel.org/stable/c/e9027ffbf5a0f3c12ca8900822e884eae9f0821b
https://git.kernel.org/stable/c/fe13adc258df88d95789e5673c7ba5178b5f8b28
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-68189 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-68189 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-68189 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-68189 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e4fa2c5c261d736b8e58759fdef3a968d510630c', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a351f68fb24828b23a971e00b8238ee0e8a40380', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a42f5536ea9c00e13f0c0fbb330feed95e2365ca', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'fe13adc258df88d95789e5673c7ba5178b5f8b28', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e9027ffbf5a0f3c12ca8900822e884eae9f0821b', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e4fa2c5c261d736b8e58759fdef3a968d510630c', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a351f68fb24828b23a971e00b8238ee0e8a40380', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a42f5536ea9c00e13f0c0fbb330feed95e2365ca', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'fe13adc258df88d95789e5673c7ba5178b5f8b28', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e9027ffbf5a0f3c12ca8900822e884eae9f0821b', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'affected'}]
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 13, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 10, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e4fa2c5c261d736b8e58759fdef3a968d510630c', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a351f68fb24828b23a971e00b8238ee0e8a40380', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'a42f5536ea9c00e13f0c0fbb330feed95e2365ca', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'fe13adc258df88d95789e5673c7ba5178b5f8b28', 'versionType': 'git'}, {'status': 'affected', 'version': '161510ccf91c961638940b03abb1ee804be53a97', 'lessThan': 'e9027ffbf5a0f3c12ca8900822e884eae9f0821b', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_sync.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Protect UUID list traversal The hci_sync conversion moved class-of-device and EIR generation from an HCI request built under hdev->lock to asynchronous command sync work. The worker holds hdev->req_lock, but that lock does not serialize access to hdev->uuids against add_uuid() and remove_uuid(), which update the list under hdev->lock. The following interleaving can therefore occur: CPU0 (command sync work) CPU1 (management socket) fetch uuid from the list list_del(&uuid->list) kfree(uuid) read uuid->size KASAN reports the resulting use-after-free: BUG: KASAN: slab-use-after-free in eir_create+0xb8f/0xee0 Read of size 1 at addr ffff88810dbd8620 by task kworker/u17:0/87 Workqueue: hci0 hci_cmd_sync_work Call Trace: eir_create+0xb8f/0xee0 hci_update_eir_sync+0x1c0/0x330 hci_cmd_sync_work+0x13c/0x290 process_one_work+0x63a/0x1070 worker_thread+0x45b/0xd10 Allocated by task 86: __kasan_kmalloc+0x8f/0xa0 add_uuid+0x18a/0x4b0 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 92: __kasan_slab_free+0x43/0x70 kfree+0x131/0x3c0 remove_uuid+0x25e/0x560 hci_sock_sendmsg+0x1033/0x1ea0 Hold hdev->lock while generating and committing the class-of-device and EIR snapshots. Release it before sending an HCI command, so controller waits do not happen under the device lock. This protects all UUID list walks in these paths and restores the serialization lost in the command sync conversion.
    Added Reference https://git.kernel.org/stable/c/a351f68fb24828b23a971e00b8238ee0e8a40380
    Added Reference https://git.kernel.org/stable/c/a42f5536ea9c00e13f0c0fbb330feed95e2365ca
    Added Reference https://git.kernel.org/stable/c/e4fa2c5c261d736b8e58759fdef3a968d510630c
    Added Reference https://git.kernel.org/stable/c/e9027ffbf5a0f3c12ca8900822e884eae9f0821b
    Added Reference https://git.kernel.org/stable/c/fe13adc258df88d95789e5673c7ba5178b5f8b28
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
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