CVE-2026-98927

High

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Fix life cycle of the nested_mmus array The nested_mmus array holds the shadow page tables that are used when a guest is running a nested context. These structures are allocated on VCPU_INIT for whole guest, which implies that they may have to be relocated as the array grows. Should a VCPU_INIT occur whilst a vcpu is actively running an L2 and that the allocation requires relocation, that vcpu will still be running with a pointer to the previous structure, which will have been freed. Fix this by turning the array of structures to an array of pointers, which is now allocated at VM creation, sized to the absolute maximum that KVM can handle. In turn, each VCPU_INIT contributes S2_MMU_PER_VCPU to the pool. No reallocation is ever performed, and the life cycle of each object is much clearer: - the nested_mmus array is allocated in kvm_init_nested(), and freed in kvm_arch_destroy_vm() - s2_mmu structures are allocated in kvm_vcpu_init_nested(), and freed on kvm_arch_flush_shadow_all() Finally, the freeing of vcpu->arch.vncr_array is made consistent rather than being done on some failure paths, but not others.

Package Linux Kernel
Published 2026-10-23
Last modified 2026-10-24
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

7.0

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

Affected versions

Linux kernel versions 6.11 and later are affected. Fixed in 6.12.113, 6.18.56, 7.2.9, 7.3 and their respective stable series.

Affected from
≥ 6.11
Fixed in
✓ 6.12.113 6.12.x ✓ 6.18.56 6.18.x ✓ 7.2.9 7.2.x ✓ 7.3

References

4 total

Frequently asked questions

  • What is CVE-2026-98927?

    CVE-2026-98927 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10 . It affects Linux kernel versions from 6.11 onward and has been patched in 6.12.113, 6.18.56, 7.2.9 and others. CVE-2026-98927 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2026-98927?

    CVE-2026-98927 has a CVSS score of 7.0 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H .

  • Is there a patch available for CVE-2026-98927?

    Yes. CVE-2026-98927 has been patched. Fixed versions include 6.12.113, 6.18.56, 7.2.9 and others. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-98927 actively exploited?

    No. CVE-2026-98927 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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