CVE-2026-99082 Linux Kernel KVM - Cache Invalidation Bypass

Linux kernel KVM x86 contains a stale MMIO cache caused by improper use of memslots in SMM address space, letting a guest cause invalid MMIO exits and bypass write-tracking, exploit requires nested EPT and crafted memory access.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Cache Invalidation Bypass
Impact
Denial Of Service, Data Tampering
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel mainline version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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