CVE-2025-71291

About vulnerability

In the Linux kernel, the following vulnerability has been resolved: misc: bcm_vk: Fix possible null-pointer dereferences in bcm_vk_read() In the function bcm_vk_read(), the pointer entry is checked, indicating that it can be NULL. If entry is NULL and rc is set to -EMSGSIZE, the following code may cause null-pointer dereferences: struct vk_msg_blk tmp_msg = entry->to_h_msg[0]; set_msg_id(&tmp_msg, entry->usr_msg_id); tmp_msg.size = entry->to_h_blks - 1; To prevent these possible null-pointer dereferences, copy to_h_msg, usr_msg_id, and to_h_blks from iter into temporary variables, and return these temporary variables to the application instead of accessing them through a potentially NULL entry. A flaw was found in the Linux kernel’s bcm_vk module. A null-pointer dereference can occur within the bcm_vk_read() function if a specific condition is met where a pointer entry is NULL and an error code -EMSGSIZE is returned. This vulnerability could allow a local attacker to cause system instability or a denial of service (DoS).

Live-patch status from KernelCare for each operating system.