CVE-2026-98164

Medium

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]

Package Linux Kernel
Published 2026-09-29
Last modified 2026-10-07
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-670

CVE-2026-98164 is classified as CWE-670

See CWE-670 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.2 and later are affected. Fixed in 6.1.187, 6.6.156, 6.12.108, 6.18.49, 7.1.13, 7.2 and their respective stable series.

Affected from
≥ 4.2
Fixed in
✓ 6.1.187 6.1.x ✓ 6.6.156 6.6.x ✓ 6.12.108 6.12.x ✓ 6.18.49 6.18.x ✓ 7.1.13 7.1.x ✓ 7.2

References

6 total
Showing 5 of 6 references View all on NVD

Frequently asked questions

  • What is CVE-2026-98164?

    CVE-2026-98164 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 4.2 onward and has been patched in 6.1.187, 6.6.156, 6.12.108 and others. CVE-2026-98164 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-98164?

    CVE-2026-98164 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H .

  • Is there a patch available for CVE-2026-98164?

    Yes. CVE-2026-98164 has been patched. Fixed versions include 6.1.187, 6.6.156, 6.12.108 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-98164 actively exploited?

    No. CVE-2026-98164 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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