CVE-2024-35933: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-35933 is a vulnerability discovered in the Linux kernel's Bluetooth subsystem, specifically in the btintel driver component. The vulnerability was disclosed on May 19, 2024, and affects multiple versions of the Linux kernel. The issue occurs in the btintel_read_version function where a null pointer dereference can occur if hci_cmd_sync_complete() is triggered and skb is NULL, resulting in hdev->req_skb being NULL (NVD).

The vulnerability is classified as a NULL Pointer Dereference (CWE-476) issue. It has been assigned a CVSS v3.1 Base Score of 5.5 (Medium) with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. The technical root cause involves the btintel_read_version function not properly handling cases where __hci_cmd_sync returns NULL, leading to a potential null pointer dereference (NVD, Kernel Patch).

The vulnerability affects the availability of the system by potentially causing a kernel crash when the null pointer dereference occurs. The issue requires local access and low privileges to exploit, with no impact on confidentiality or integrity of the system (NVD).

The vulnerability was discovered and reported by the Syzkaller automated testing system (syzbot). The issue requires local access to the system and low privileges to exploit. There are no known reports of this vulnerability being exploited in the wild (Kernel Patch).

The vulnerability has been fixed in multiple Linux kernel versions through a patch that adds proper NULL checking using IS_ERR_OR_NULL instead of just IS_ERR. The fix has been backported to various stable kernel versions and is available in distribution updates including Ubuntu and Debian (Ubuntu, Debian).