Riskcovery

CVE-2026-98469

KVM: arm64: Fix AArch32 DBGBXVR<n> handling

State
Published
Severity
7.1 High
Published
Oct 18, 2026
Updated
Oct 24, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.1 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 3ce9f3357e9e099f02feaa002769eb99ef1138cd to before 8530a05b304d312fe7dfbc5df7d3e87cc31b256aAffected
  • 3ce9f3357e9e099f02feaa002769eb99ef1138cd to before af6813d16ace2765011ca1c567be86ade1d1ee8eAffected
  • 3ce9f3357e9e099f02feaa002769eb99ef1138cd to before 6b1bca1b1ab77f60a62087337bfe6e2f0efb9e6dAffected
LinuxLinux
  • 6.14Affected
  • before 6.14Not affected
  • 6.18.55 through 6.18.*Not affected
  • 7.2.9 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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