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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-27 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Linux kernel: before 5.4.284; from 5.5 before 5.10.226; from 5.11 before 5.15.167; from 5.16 before 6.1.110; from 6.2 before 6.6.51; from 6.7 before 6.10.10 — fixed in 5.10.226, 5.15.167, 5.4.284, 6.1.110, 6.10.10, 6.6.51

How to fix

Upgrade to a fixed version: Linux kernel 5.10.226, 5.15.167, 5.4.284, 6.1.110. Check the vendor advisory for mitigations.

References

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