CVE-2026-89961 Linux Kernel - Memory Management Logic Error

Linux kernel contains a logic error in powerpc/mm vmemmap population caused by incorrect addr_pfn tracking in compound pages, letting the system incorrectly map head/tail pages, exploit requires kernel-level access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Memory Management Logic Error
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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 for addr_pfn tracking in compound vmemmap population.

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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