Answer in brief
CVE-2026-98718 records a Unknown severity vulnerability in KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=37dfb676fafd1eef36fe0bb649607afbb0d5521b <8b7d4f68fef96cebe0b6dbb6e5607772337f7369 || >=d4cc2dff12116a700add601c0262132cc26e1b2c <de83ff6a4d8f3618473bedb3c4400020c22e8a8a || >=93de2a6a4b91b72607136dd656edf03fb399d27f <973ea70393e885e540f714904e51bc6cac80e3d7 || >=6.18.55 <6.18.56 || >=7.2.9 <7.2.10 | 8b7d4f68fef96cebe0b6dbb6e5607772337f7369, de83ff6a4d8f3618473bedb3c4400020c22e8a8a, 973ea70393e885e540f714904e51bc6cac80e3d7, 6.18.56, 7.2.10 |
| Linux/Linuxgeneric | 7.3-rc5 | Not reported |
| Linux/Linuxgeneric | >=37dfb676fafd1eef36fe0bb649607afbb0d5521b <8b7d4f68fef96cebe0b6dbb6e5607772337f7369 || >=d4cc2dff12116a700add601c0262132cc26e1b2c <de83ff6a4d8f3618473bedb3c4400020c22e8a8a || >=93de2a6a4b91b72607136dd656edf03fb399d27f <973ea70393e885e540f714904e51bc6cac80e3d7 | 8b7d4f68fef96cebe0b6dbb6e5607772337f7369, de83ff6a4d8f3618473bedb3c4400020c22e8a8a, 973ea70393e885e540f714904e51bc6cac80e3d7 |
| Linux/Linuxgeneric | >=6.18.55 <6.18.56 || >=7.2.9 <7.2.10 | 6.18.56, 7.2.10 |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state Explicitly flush caches after intra-host migration before clearing "SEV active" on the source VM, as doing cache maintenance afterwards creates a tiny window where memory reclaim could return memory to the host without performing a cache flush, e.g. as pointed out by Sashiko: CPU1 in sev_migrate_from(): src->active = false; CPU2 running concurrent unmap: Since active is false, the automatic cache flush in sev_guest_memory_reclaimed is skipped. The host frees and reallocates the page. CPU1 in sev_migrate_from(): sev_writeback_caches(src_kvm); Executes a hardware cache flush (wbnoinvd), which writes the guest's old dirty ciphertext over the new page owner's data.
Quoted source text, attributed separately from HOL analysis.