CVE-2026-98718KVM: SEV: Do cache maintenance on the source VM *before* clearing SEV state
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | 37dfb676fafd1eef36fe0bb649607afbb0d5521b builds before 8b7d4f68fef96cebe0b6dbb6e5607772337f7369; from d4cc2dff12116a700add601c0262132cc26e1b2c before de83ff6a4d8f3618473bedb3c4400020c22e8a8a; from 93de2a6a4b91b72607136dd656edf03fb399d27f before 973ea70393e885e540f714904e51bc6cac80e3d7; from 6.18.55 before 6.18.56; from 7.2.9 before 7.2.10 | CNA record |
References
- https://git.kernel.org/stable/c/8b7d4f68fef96cebe0b6dbb6e5607772337f7369
- https://git.kernel.org/stable/c/de83ff6a4d8f3618473bedb3c4400020c22e8a8a
- https://git.kernel.org/stable/c/973ea70393e885e540f714904e51bc6cac80e3d7
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.