{"id":"CVE-2026-98718","published":"2026-10-18T16:17:25.363","lastModified":"2026-10-19T10:19:36.047","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state\n\nExplicitly flush caches after intra-host migration before clearing \"SEV\nactive\" on the source VM, as doing cache maintenance afterwards creates a\ntiny window where memory reclaim could return memory to the host without\nperforming a cache flush, e.g. as pointed out by Sashiko:\n\n  CPU1 in sev_migrate_from():\n    src->active = false;\n\n  CPU2 running concurrent unmap:\n    Since active is false, the automatic cache flush in\n    sev_guest_memory_reclaimed is skipped.\n    The host frees and reallocates the page.\n\n  CPU1 in sev_migrate_from():\n    sev_writeback_caches(src_kvm);\n    Executes a hardware cache flush (wbnoinvd), which writes the guest's old\n    dirty ciphertext over the new page owner's data.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/8b7d4f68fef96cebe0b6dbb6e5607772337f7369","tags":[]},{"url":"https://git.kernel.org/stable/c/973ea70393e885e540f714904e51bc6cac80e3d7","tags":[]},{"url":"https://git.kernel.org/stable/c/de83ff6a4d8f3618473bedb3c4400020c22e8a8a","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}