What’s Vulnerable › Vulnerabilities

CVE-2024-42132: bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-30 · updated 2026-08-04
• Weakness: CWE-763

Description

In the Linux kernel, the following vulnerability has been resolved: bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX Syzbot hit warning in hci_conn_del() caused by freeing handle that was not allocated using ida allocator. This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by hci_le_big_sync_established_evt(), which makes code think it's unset connection. Add same check for handle upper bound as in hci_conn_set_handle() to prevent warning.

Affected products

• Linux kernel: from 6.5.12 before 6.6; from 6.6.2 before 6.6.39; from 6.7 before 6.9.9; 6.10-rc1, 6.10-rc2, 6.10-rc3, 6.10-rc4, 6.10-rc5, 6.10-rc6 — fixed in 6.6, 6.6.39, 6.9.9

How to fix

Upgrade to a fixed version: Linux kernel 6.6, 6.6.39, 6.9.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1cc18c2ab2e8c54c355ea7c0423a636e415a0c23
• https://git.kernel.org/stable/c/2ae8d7742a09c275872e670c53337b3dcedaa11c
• https://git.kernel.org/stable/c/4970e48f83dbd21d2a6a7cdaaafc2a71f7f45dc4
• https://git.kernel.org/stable/c/d311036696fed778301d08a71a4bef737b86d8c5
• https://git.kernel.org/stable/c/1cc18c2ab2e8c54c355ea7c0423a636e415a0c23
• https://git.kernel.org/stable/c/4970e48f83dbd21d2a6a7cdaaafc2a71f7f45dc4
• https://git.kernel.org/stable/c/d311036696fed778301d08a71a4bef737b86d8c5

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