Linux Kernel up to 7.2.0 hci_sync hci_update_event_filter_sync accept_list use after free

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability labeled as very critical has been found in Linux Kernel up to 7.2.0. This affects the function hci_update_event_filter_sync of the component hci_sync. Executing a manipulation of the argument accept_list can lead to use after free. The identification of this vulnerability is CVE-2026-80762. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 7.2.0 and classified as very critical. This vulnerability affects the function hci_update_event_filter_sync of the component hci_sync. The manipulation of the argument accept_list with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix accept list UAF during suspend hci_update_event_filter_sync() walks hdev->accept_list while sending a synchronous HCI command for each remote-wakeup device. The suspend path holds hdev->req_lock, but accept-list updates are serialized by hdev->lock. Consequently, remove_device() can free the current list entry during the controller wait. The following interleaving causes the use-after-free: hci_update_event_filter_sync() remove_device() fetch accept-list entry hci_set_event_filter_sync() wait for controller response hci_dev_lock() list_del() kfree() hci_dev_unlock() read the freed list.next KASAN reported: BUG: KASAN: slab-use-after-free in hci_suspend_sync+0x835/0x910 Read of size 8 at addr ffff88810bec8440 by task kworker/0:1/10 Workqueue: events vhci_suspend_work Call Trace: hci_suspend_sync+0x835/0x910 hci_suspend_dev+0x182/0x450 process_one_work+0x661/0x1090 worker_thread+0x45b/0xd10 Allocated by task 86: hci_bdaddr_list_add_with_flags+0x1a8/0x400 add_device+0x381/0x820 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 91: kfree+0x131/0x3c0 remove_device+0x429/0xb70 hci_sock_sendmsg+0x1033/0x1ea0 Snapshot the remote-wakeup addresses under hdev->lock. Release the lock before sending HCI commands. Clear the controller event filter before building the snapshot, and skip allocation and the second list traversal when there are no matching entries. This preserves the original filter and scan-state updates without retaining an accept-list node across a controller wait.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-80762 since 08/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 09/04/2026).

Upgrading to version 6.1.187, 6.6.156, 6.12.108, 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch bb5f5414d1a6272a16f68684e998f4063dd19f57/b5181516a9f5c2fdb3271cdad72a5b16c6963a44/87ad116ac3abc6f2ce2b5b6c488f633003581eee/fe93a697a7a92fa9adf78c9ff67a10db3193290c/95bb57bc11a91caf042ad00fca85e480d3fda37f/29c59212a507804d7616b8abf491d30b4ab8e75f/f57b399c4fa1501b2d5451f52d861ece86bcf3db is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.187/6.6.156/6.12.108/6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: bb5f5414d1a6272a16f68684e998f4063dd19f57/b5181516a9f5c2fdb3271cdad72a5b16c6963a44/87ad116ac3abc6f2ce2b5b6c488f633003581eee/fe93a697a7a92fa9adf78c9ff67a10db3193290c/95bb57bc11a91caf042ad00fca85e480d3fda37f/29c59212a507804d7616b8abf491d30b4ab8e75f/f57b399c4fa1501b2d5451f52d861ece86bcf3db

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80762 (🔒)
GCVE (CVE): GCVE-0-2026-80762
GCVE (VulDB): GCVE-100-398884

Entryinfo

Created: 09/04/2026 17:56
Changes: 09/04/2026 17:56 (60)
Complete: 🔍
Cache ID: 216::103

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