{"id":"CVE-2026-98471","title":"kernel: KVM: SEV: Do cache maintenance on the source VM during intra-host migration (CVE-2026-98471)","summary":"A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for AMD SEV (Secure Encrypted Virtualization). During intra-host migration of an encrypted virtual machine, the source virtual machine's CPU caches are not…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H","cvssSource":"vendor","cwe":["CWE-226","CWE-459"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","affected":["enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_container_platform 4"],"published":"2026-10-18","updated":"2026-10-24","sourceUpdated":"2026-10-24T14:27:51+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98471.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98471.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98471"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2554844"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98471"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98471"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98471.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-98471"},{"url":"https://git.kernel.org/stable/c/37dfb676fafd1eef36fe0bb649607afbb0d5521b"},{"url":"https://git.kernel.org/stable/c/d4cc2dff12116a700add601c0262132cc26e1b2c"},{"url":"https://git.kernel.org/stable/c/93de2a6a4b91b72607136dd656edf03fb399d27f"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00158,"epssPercentile":0.04894,"scores":{"vendor":5.6,"cna":7.1},"ingestedAt":"2026-10-18T15:45:12.299Z","slug":"CVE-2026-98471","body":"## Overview\n\nA flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem for AMD SEV (Secure Encrypted Virtualization). During intra-host migration of an encrypted virtual machine, the source virtual machine's CPU caches are not properly flushed before the system reclaims its memory. A local attacker could exploit this issue to read residual data remaining in the processor cache, leading to an information disclosure of sensitive guest memory.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98471.json)\n\n**kernel: KVM: SEV: Do cache maintenance on the source VM during intra-host migration** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.\n\nAffected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\nNot affected:\n\n- Red Hat Enterprise Linux 6\n- Red Hat Enterprise Linux 7\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229504,"id":"CVE-2026-98471","ts":1793019824278,"field":"cvss","old":"7.1","new":"5.3"},{"seq":229503,"id":"CVE-2026-98471","ts":1793019824278,"field":"severity","old":"high","new":"medium"},{"seq":228960,"id":"CVE-2026-98471","ts":1792854121602,"field":"cvss","old":"5.6","new":"7.1"},{"seq":228959,"id":"CVE-2026-98471","ts":1792854121602,"field":"severity","old":"medium","new":"high"},{"seq":225669,"id":"CVE-2026-98471","ts":1792498348150,"field":"cvss","old":null,"new":"5.6"},{"seq":225668,"id":"CVE-2026-98471","ts":1792498348150,"field":"severity","old":"none","new":"medium"}]}