Live › vulnerability › CVE-2026-98469
Go to dashboardThe Linux kernel's arm64 KVM code mishandles AArch32 guest accesses to the DBGBXVR breakpoint registers after a refactor. The access triggers a kernel BUG and marks the virtual machine dead.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Hosts running Linux KVM on arm64 that run 32-bit AArch32 guests with debug register use are the likely exposure; the sources do not name affected kernel versions. unknown whether guests can trigger this without special setup.
No product ranges from the sources yet.
Unknown from the sources.
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
In the Linux kernel, the following vulnerability has been resolved:
KVM: arm64: Fix AArch32 DBGBXVR<n> handling
The consolidation of the breakpoint and watchpoint register accessors switched DBGBXVR<n> from trap_bvr() to trap_dbg_wb_reg(). The latter selects backing storage with demux_wb_reg(), which only handles Op2 values 4 through 7. Since DBGBXVR<n> uses Op2 1, an AArch32 guest access hits KVM_BUG_ON() and marks the VM dead.
DBGBXVR<n> aliases DBGBVR<n>_EL1[63:32], and its AA32(HI) descriptor already selects the upper half. Map Op2 1 to dbg_bvr[] alongside Op2 4, restoring the pre-regression behavior.
This page as .md · .json · in your agent: get_signal("CVE-2026-98469")
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.