Reachable assertion in Linux kernel - CVE-2026-98469

Vulnerability identifier: #VU156767

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-98469

CWE-ID: CWE-617

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

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

• Reachable assertion in Linux kernel arm64 kvm
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more