CVE-2024-46822

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

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/f57769ff6fa7f97f1296965f20e8a2bb3ee9fd0f patch
https://git.kernel.org/stable/c/4c3b21204abb4fa3ab310fbbb5cf7f0e85f3a1bc patch
https://git.kernel.org/stable/c/945be49f4e832a9184c313fdf8917475438a795b patch
https://git.kernel.org/stable/c/40cae0df42e5e7f7a1c0f32deed9c4027c1ba94e patch
https://git.kernel.org/stable/c/62ca6d3a905b4c40cd942f3cc645a6718f8bc7e7 patch
https://git.kernel.org/stable/c/bc7fbb37e3d2df59336eadbd6a56be632e3c7df7 patch
https://git.kernel.org/stable/c/2488444274c70038eb6b686cba5f1ce48ebb9cdd patch

Frequently Asked Questions

What is the severity of CVE-2024-46822?
CVE-2024-46822 has been scored as a medium severity vulnerability.
How to fix CVE-2024-46822?
To fix CVE-2024-46822, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-46822 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-46822 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-46822?
CVE-2024-46822 affects Linux Linux, Linux Linux.
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