CVE-2026-98469
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.
How to fix
- Linux Linux8530a05b304d312fe7dfbc5df7d3e87cc31b256a, af6813d16ace2765011ca1c567be86ade1d1ee8e, 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 3ce9f3357e9e099f02feaa002769eb99ef1138cd ≤ v < 8530a05b304d312fe7dfbc5df7d3e87cc31b256a, 3ce9f3357e9e099f02feaa002769eb99ef1138cd ≤ v < af6813d16ace2765011ca1c567be86ade1d1ee8e, 3ce9f3357e9e099f02feaa002769eb99ef1138cd ≤ v < 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d, 6.14 | 8530a05b304d312fe7dfbc5df7d3e87cc31b256a, af6813d16ace2765011ca1c567be86ade1d1ee8e, 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d |
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