Stale translations via dropped pending TLB flushes
Published Oct 18, 2026 · Updated Oct 18, 2026
TLB invalidation failure in Linux KVM SVM allows guest OS users to retain stale translations after a failed VMRUN. The svm_vcpu_run function clears the VMCB's pending TLB control even when guest entry fails and the processor has not performed the flush, while all-ASID flush requirements are not tracked per physical CPU. Exposure requires the SVM virtualization path and failed guest entry; the published material does not establish a specific data-access capability or service-interruption outcome.
Summary
What happened
TLB invalidation failure in Linux KVM SVM allows guest OS users to retain stale translations after a failed VMRUN. The svm_vcpu_run function clears the VMCB's pending TLB control even when guest entry fails and the processor has not performed the flush, while all-ASID flush requirements are not tracked per physical CPU. Exposure requires the SVM virtualization path and failed guest entry; the published material does not establish a specific data-access capability or service-interruption outcome.
The record
- CVE
- CVE-2026-98715
- Published
- Oct 18, 2026
- Updated
- Oct 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 18, 2026CVE publishedPublication date reported by the CVE source.
- Oct 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.6.38
- Affected versionversion=38e5e92fe8c02a8766459d505423b855caf9af1f <60d93c27859fb3ec5b5a689e24de303f166477d0
- Affected versionversion=38e5e92fe8c02a8766459d505423b855caf9af1f <fd873c3d1b5240e80365f09e758e8c96b88a7cdb
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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