SB2026102239 - Reachable assertion in Linux kernel arm64 kvm

Description

This security bulletin contains information about 1 vulnerability.

1) Reachable assertion (CVE-ID: CVE-2026-98469)

CWE-ID: CWE-617 - Reachable Assertion

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a denial of service by terminating the affected virtual machine.

The vulnerability exists due to a reachable assertion in the Linux kernel KVM arm64 debug register handling when processing AArch32 guest accesses to DBGBXVR. A local privileged user can access this register from a guest to trigger KVM_BUG_ON() and cause KVM to mark the virtual machine dead because demux_wb_reg() does not handle its Op2 value of 1.

Remediation

Install update from vendor's website.

References

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