SB20261022322 - NULL pointer dereference in Linux kernel kvm mmu

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Main Vulnerability Database SB20261022322

SB20261022322 - NULL pointer dereference in Linux kernel kvm mmu

Published: October 22, 2026

Security Bulletin ID SB20261022322
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-98717)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service through a kernel NULL pointer dereference.

The vulnerability exists due to a null pointer dereference in the Linux kernel KVM x86 shadow page-table walker when memory-slot creation races with a stage-2 page fault from a nested guest (L2). A local user can trigger this race to cause a shadow page-table walk through a dummy root backed by the zero page, resulting in a kernel crash.


Remediation

Install update from vendor's website.

References