CVE-2024-46822 arm64: acpi: Harden get_cpu_for_acpi_id() against missing CPU entry

What is CVE-2024-46822?

CVE-2024-46822 is a medium-severity vulnerability in Linux kernel, published on 27 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

arm64: acpi: Harden get_cpu_for_acpi_id() against missing CPU entry

In a review discussion of the changes to support vCPU hotplug where a check was added on the GICC being enabled if was online, it was noted that there is need to map back to the cpu and use that to index into a cpumask. As such, a valid ID is needed.

If an MPIDR check fails in acpi_map_gic_cpu_interface() it is possible for the entry in cpu_madt_gicc[cpu] == NULL. This function would then cause a NULL pointer dereference. Whilst a path to trigger this has not been established, harden this caller against the possibility.

Weakness: CWE-476

Which versions are affected by CVE-2024-46822?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-46822?

Apply the vendor's patch.

Is CVE-2024-46822 being exploited?

There is no known exploitation of CVE-2024-46822 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-49804, BELL-CVE-2024-46822, DEBIAN-CVE-2024-46822, GHSA-m9f5-xhjx-v44f, UBUNTU-CVE-2024-46822.