CVE-2026-98469
HIGH
MEDIUM
Priority: 0.01
BB Relevance:
49/100
Published: 2026-10-18
Modified: 2026-10-24
First seen: 2026-10-29
Status: active
Attack Surface
Low Complexity
No Auth
No Interaction
Scope Change
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
None
S:
Changed
C:
None
I:
None
A:
High
Description
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.