Bug 2516426 (CVE-2026-72291)

Summary: CVE-2026-72291 kernel: KVM: s390: Fix unlikely race in try_get_locked_pte()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel, specifically within the Kernel-based Virtual Machine (KVM) for the s390 architecture. An unlikely race condition exists in the `try_get_locked_pte()` function. This issue could occur if page table entries are unmapped during specific memory management operations. The exact impact of this race condition is not specified, but it represents a stability concern within the kernel's memory handling.
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:11:52 UTC
In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: Fix unlikely race in try_get_locked_pte()

Fix an unlikely race in try_get_locked_pte(), which could have happened
if puds or pmds get unmapped between the p?dp_get() and p?d_offset()
functions.