CVE-2026-23433

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> arm_mpam: Fix null pointer dereference when restoring bandwidth counters<br /> <br /> When an MSC supporting memory bandwidth monitoring is brought offline and<br /> then online, mpam_restore_mbwu_state() calls __ris_msmon_read() via ipi to<br /> restore the configuration of the bandwidth counters. It doesn&amp;#39;t care about<br /> the value read, mbwu_arg.val, and doesn&amp;#39;t set it leading to a null pointer<br /> dereference when __ris_msmon_read() adds to it. This results in a kernel<br /> oops with a call trace such as:<br /> <br /> Call trace:<br /> __ris_msmon_read+0x19c/0x64c (P)<br /> mpam_restore_mbwu_state+0xa0/0xe8<br /> smp_call_on_cpu_callback+0x1c/0x38<br /> process_one_work+0x154/0x4b4<br /> worker_thread+0x188/0x310<br /> kthread+0x11c/0x130<br /> ret_from_fork+0x10/0x20<br /> <br /> Provide a local variable for val to avoid __ris_msmon_read() dereferencing<br /> a null pointer when adding to val.