CVE-2026-98283 Linux Kernel KVM PPC Book3S HV - Use After Free

Linux kernel KVM PPC Book3S HV contains a use-after-free vulnerability caused by improper reference handling in kvmhv_emulate_tlbie_all_lpid(), letting concurrent vCPUs access freed memory, exploit requires concurrent nested guest vCPU execution.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Remote Code Execution, 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
6 October 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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