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CVE-2026-98164

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Check write tracking in all address spaces kvm_gfn_is_write_tracked() checks only the supplied memslot, but page…

Published Sep 29, 2026linuxCWE-670EPSS 0.15%

Overview

CVE-2026-98164 is a high-severity vulnerability affecting linux linux_kernel. It was published on September 29, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86/mmu: Check write tracking in all address spaces

kvm_gfn_is_write_tracked() checks only the supplied memslot, but page

tracking is per-address-space and shadow pages are shared across all

address spaces. With SMM, a GFN can therefore be write-tracked in one

address space and appear untracked through the other.

Check the supplied slot first, then the slot for the other address space.

This ensures all callers honor write tracking regardless of the active

address space. In particular, it prevents mmu_try_to_unsync_pages() from

marking an upper-level shadow page unsync and eventually triggering the

BUG in pte_list_remove().

[invert direction of the conditional. - Paolo]

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel>= 4.2, < 6.1.187Affected

References

Refgit.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886fRefgit.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26Refgit.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77Refgit.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112Refgit.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212aRefgit.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98164?

CVE-2026-98164 is a high-severity vulnerability affecting linux linux_kernel. It was published on September 29, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-98164?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-98164?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-98164?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98164 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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