CVE-2026-89911: KVM: arm64: Correctly cap TLBI Range to the architural limit
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Correctly cap TLBI Range to the architural limit
TLB Invalidation by Range has a fairly powerful way of encoding pretty large ranges in a small number of bits. This range can be based on an arbitrary VA, which means it is pretty easy for a guest to generate an overflow should the hypervisor be naive enough to add the range to the base...
Make sure the range is capped to the limit dictated by the address bit that determines the VA range. For an IPA invalidation, this is further corrected down the line to ignore the upper range.
Affected Software
Event History
Frequently Asked Questions
What access does an attacker need to exercise this issue?
The issue can be triggered by a guest that generates a TLB invalidation-by-range operation with a range that overflows when added to an arbitrary virtual-address base. It is relevant to KVM on arm64 hosts.
How is the overflow condition addressed for IPA invalidations?
The range is capped using the address bit that determines the virtual-address range. For IPA invalidation, upper portions of the range are additionally ignored later in processing.