Race condition in Linux kernel - CVE-2026-98718

Vulnerability identifier: #VU157065

CSH Severity: Low

CVSS v4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98718

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to corrupt data in host memory reallocated to another owner.

The vulnerability exists due to a race condition in the Linux kernel KVM SEV sev_migrate_from() function when intra-host migration overlaps with memory reclamation. A local user can exploit the interval between clearing the source VM's SEV active state and flushing its caches to cause stale guest ciphertext to overwrite data in a freed and reallocated page.

Linux kernel
SUSE Linux Micro
SUSE Linux Micro Extras
kernel-default
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-default-devel
kernel-syms
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-debugsource
kernel-default-devel-debuginfo

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-default - update to 6.4.0-159998.55.1
kernel-64kb - update to 6.4.0-159998.55.1
kernel-64kb-debugsource - update to 6.4.0-159998.55.1
kernel-64kb-devel - update to 6.4.0-159998.55.1
kernel-default-devel - update to 6.4.0-159998.55.1
kernel-syms - update to 6.4.0-159998.55.1
kernel-obs-build - update to 6.4.0-159998.55.1
kernel-obs-build-debugsource - update to 6.4.0-159998.55.1
kernel-default-debugsource - update to 6.4.0-159998.55.1
kernel-default-devel-debuginfo - update to 6.4.0-159998.55.1

• https://git.kernel.org/stable/c/8b7d4f68fef96cebe0b6dbb6e5607772337f7369
• https://git.kernel.org/stable/c/973ea70393e885e540f714904e51bc6cac80e3d7
• https://git.kernel.org/stable/c/de83ff6a4d8f3618473bedb3c4400020c22e8a8a

• Race condition in Linux kernel kvm svm
• SUSE update for the Linux Kernel