IOMMU freed-memory access via stale alias cache
Published Sep 17, 2026 · Updated Sep 18, 2026
Use-after-free in the Linux kernel 6.11 and affected later lines allows local users to trigger an IOMMU walk through freed memory. The alias teardown functions clear each alias entry but flush intel_context_flush_no_pasid() with the device's own requester ID, leaving other source IDs cached. Reachability requires Intel VT-d scalable mode, a DMA alias, and teardown of the aliased device; no more specific runtime consequence has been published.
Summary
What happened
Use-after-free in the Linux kernel 6.11 and affected later lines allows local users to trigger an IOMMU walk through freed memory. The alias teardown functions clear each alias entry but flush intel_context_flush_no_pasid() with the device's own requester ID, leaving other source IDs cached. Reachability requires Intel VT-d scalable mode, a DMA alias, and teardown of the aliased device; no more specific runtime consequence has been published.
The record
- CVE
- CVE-2026-90240
- Published
- Sep 17, 2026
- Updated
- Sep 18, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-411
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 17, 2026CVE publishedPublication date reported by the CVE source.
- Sep 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.11
- Affected versionversion=f90584f4beb84211c4d21b319cc13f391fe9f3c2 <5baddf100b3be730912485648cbaae5e3a251923
- Affected versionversion=f90584f4beb84211c4d21b319cc13f391fe9f3c2 <a803141597d61dc0511f7cd849625e17d042ca8a
- Affected versionversion=f90584f4beb84211c4d21b319cc13f391fe9f3c2 <c54e4ae971b98e8d650400137d332cee56c03f55
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Get started to see how Hinoki identifies affected software and validates exploitability in your environment.
Get started