CVE-2026-89908 Linux Kernel KVM - Memory Region Flags Preservation

Linux kernel KVM on LoongArch contains a memory region flags preservation vulnerability caused by improper handling of memslot arch flags during KVM_MR_FLAGS_ONLY updates, letting attackers cause incorrect memory mappings, exploit requires KVM_MR_FLAGS_ONLY update.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Memory Region Flags Preservation
Impact
Data Tampering, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel 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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