CVE-2026-98718: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 37dfb676fafd1eef36fe0bb649607afbb0d5521b преди 8b7d4f68fef96cebe0b6dbb6e5607772337f7369; d4cc2dff12116a700add601c0262132cc26e1b2c преди de83ff6a4d8f3618473bedb3c4400020c22e8a8a; 93de2a6a4b91b72607136dd656edf03fb399d27f преди 973ea70393e885e540f714904e51bc6cac80e3d7
• Linux Linux: 6.18.55 преди 6.18.56; 7.2.9 преди 7.2.10

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-98718
• https://nvd.nist.gov/vuln/detail/CVE-2026-98718
• https://git.kernel.org/stable/c/8b7d4f68fef96cebe0b6dbb6e5607772337f7369
• https://git.kernel.org/stable/c/de83ff6a4d8f3618473bedb3c4400020c22e8a8a
• https://git.kernel.org/stable/c/973ea70393e885e540f714904e51bc6cac80e3d7