CVE-2026-80764
Received Received - Intake

Use-After-Free in Linux Kernel Bluetooth Component

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix LE list UAF on reset hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80764
EUVD
EUVD-2026-71407

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a use-after-free vulnerability in the Linux kernel's Bluetooth subsystem. It occurs when the hci_cc_reset() function clears Bluetooth LE accept and resolving lists without proper locking. This allows a race condition where a debugfs reader can access a list entry after it has been freed, leading to potential memory corruption and crashes.

Detection Guidance

This vulnerability is specific to the Linux kernel's Bluetooth subsystem and may not have direct network detection commands. However, you can check for kernel logs indicating slab-use-after-free errors related to Bluetooth or hci_event. Use commands like dmesg | grep -i 'KASAN\|slab-use-after-free\|hci_event' to search for relevant errors.

Impact Analysis

This vulnerability could allow an attacker to cause a denial-of-service condition by crashing the system or potentially execute arbitrary code. It may also lead to information disclosure if memory contents are exposed through the stale pointer dereference.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a Linux kernel Bluetooth subsystem issue involving a use-after-free condition during reset operations. Compliance impacts would depend on system-specific implementations and whether the flaw leads to unauthorized data access or processing, which is not described here.

Mitigation Strategies

Apply the latest Linux kernel patches that address this issue. Since the vulnerability is fixed by taking the hdev->lock around list clears, updating to a patched kernel version is the primary mitigation. Monitor kernel security advisories for updates related to CVE-2026-80764.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-80764. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart