SB2026102241 - Incomplete cleanup in Linux kernel kvm svm

Description

This security bulletin contains information about 1 vulnerability.

1) Incomplete cleanup (CVE-ID: CVE-2026-98471)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to potentially disclose sensitive guest data left in CPU caches.

The vulnerability exists due to incomplete cache cleanup in the Linux kernel KVM SEV subsystem when performing intra-host VM migration and subsequently destroying the source VM. A local user can potentially exploit residual cached data to disclose sensitive guest information because converting the source VM to a non-SEV VM prevents its memory reclamation flows from triggering cache maintenance.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/37dfb676fafd1eef36fe0bb649607afbb0d5521b
• https://git.kernel.org/stable/c/93de2a6a4b91b72607136dd656edf03fb399d27f
• https://git.kernel.org/stable/c/d4cc2dff12116a700add601c0262132cc26e1b2c