CVE-2024-46707: KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Make ICCSGIEL1 undef in the absence of a vGICv3
On a system with a GICv3, if a guest hasn't been configured with GICv3 and that the host is not capable of GICv2 emulation, a write to any of the ICCSGIEL1 registers is trapped to EL2.
We therefore try to emulate the SGI access, only to hit a NULL pointer as no private interrupt is allocated (no GIC, remember?).
The obvious fix is to give the guest what it deserves, in the shape of a UNDEF exception.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-46707?
The severity of CVE-2024-46707 is currently classified as high due to the potential for privilege escalation.
How do I fix CVE-2024-46707?
To fix CVE-2024-46707, upgrade the Linux kernel to version 5.10.226 or later, or apply the specific patches provided by your vendor.
What versions of the Linux kernel are affected by CVE-2024-46707?
CVE-2024-46707 affects multiple versions of the Linux kernel ranging from 5.10 up to but not including 5.15, as well as other specified versions.
Is there a workaround for CVE-2024-46707?
There are no known effective workarounds for CVE-2024-46707; patching is strongly advised.
What causes CVE-2024-46707?
CVE-2024-46707 is caused by improper handling of the ICC registers in the Linux kernel on systems using GICv3 without appropriate configurations.