CVE-2026-89513 Linux Kernel KVM - Out-of-Bounds Read/Write

Linux kernel KVM on RISC-V contains an out-of-bounds read/write caused by incorrect PMU event info array size calculation in kvm_riscv_vcpu_pmu_event_info, letting nested guest attackers cause memory corruption, exploit requires nested guest access.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Out-of-Bounds Read/Write
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
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for PMU event info array size overflow.

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

← All CVEs