CVE-2026-23433

In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Fix null pointer dereference when restoring bandwidth counters When an MSC supporting memory bandwidth monitoring is brought offline and then online, mpam_restore_mbwu_state() calls __ris_msmon_read() via ipi to restore the configuration of the bandwidth counters. It doesn't care about the value read, mbwu_arg.val, and doesn't set it leading to a null pointer dereference when __ris_msmon_read() adds to it. This results in a kernel oops with a call trace such as: Call trace: __ris_msmon_read+0x19c/0x64c (P) mpam_restore_mbwu_state+0xa0/0xe8 smp_call_on_cpu_callback+0x1c/0x38 process_one_work+0x154/0x4b4 worker_thread+0x188/0x310 kthread+0x11c/0x130 ret_from_fork+0x10/0x20 Provide a local variable for val to avoid __ris_msmon_read() dereferencing a null pointer when adding to val.

The following products are affected by CVE-2026-23433 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23433.

URL	Resource
https://git.kernel.org/stable/c/4ad79c874e53ebb7fe3b8ae7ac6c858a2121f415
https://git.kernel.org/stable/c/ac3e12bc195786d3d44d730b5b2259fd36191848
https://lore.kernel.org/linux-cve-announce/2026040311-CVE-2026-23433-01be@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-23433
https://www.cve.org/CVERecord?id=CVE-2026-23433