CVE-2024-40929: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-40929 affects the Linux kernel's iwlwifi driver component. The vulnerability was discovered and disclosed on July 12, 2024, and involves a potential out-of-bounds access issue in the iwlwifi module's MVM (Modular Virtual Machine) scanning functionality. The vulnerability affects various versions of the Linux kernel that include the iwlwifi driver (NVD).

The vulnerability exists in the iwlwifi driver's MVM scanning functionality where the code accesses the ssids pointer without properly checking the nssids value first. In some versions of cfg80211, the ssids pointer might be valid even when nssids is 0, which can lead to an out-of-bounds access. The issue stems from the adaptive dwell support feature introduced in commit c1a7515393e4 (Kernel Commit).

If exploited, this vulnerability could lead to an out-of-bounds memory access in the kernel's wireless networking subsystem. This could potentially result in system crashes, memory corruption, or potential privilege escalation, affecting systems using the Intel wireless (iwlwifi) driver (NVD).

The vulnerability has been fixed in multiple Linux kernel versions through patches that add proper validation of n_ssids before accessing the ssids pointer. Ubuntu has released fixes for various versions including 24.04 LTS (6.8.0-44.44), 22.04 LTS (5.15.0-121.131), and 20.04 LTS (5.4.0-200.220). Red Hat has also released fixes for affected versions in RHEL 9 (Ubuntu Security, Red Hat Security).