CWE
476
Advisory Published
Updated

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

First published: Fri Sep 27 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<5.4.284
Linux Linux kernel>=5.5<5.10.226
Linux Linux kernel>=5.11<5.15.167
Linux Linux kernel>=5.16<6.1.110
Linux Linux kernel>=6.2<6.6.51
Linux Linux kernel>=6.7<6.10.10
debian/linux<=5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.12.5-1
6.12.6-1

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