CVE-2024-42132

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 its unset connection.

Add same check for handle upper bound as in hci_conn_set_handle() to prevent warning.

Weakness

The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.

Affected Software

Extended Description

This weakness can take several forms, such as:

Potential Mitigations

• Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, glibc in Linux provides protection against free of invalid pointers.

References

• https://git.kernel.org/stable/c/1cc18c2ab2e8c54c355ea7c0423a636e415a0c23
• 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