Local privilege escalation via DMA length truncation
Published Jul 25, 2026 · Updated Jul 25, 2026
Integer truncation in the Linux Kernel DFL AFU driver allows local users to corrupt kernel memory through a crafted DMA mapping ioctl. afu_ioctl_dma_map() accepts an unchecked 64-bit length, shifts it into a page count, and passes it to pin_user_pages_fast(), whose int parameter truncates oversized values. Access to an AFU port device and DFL hardware is required; successful exploitation elevates privileges or executes code in the kernel.
Summary
What happened
Integer truncation in the Linux Kernel DFL AFU driver allows local users to corrupt kernel memory through a crafted DMA mapping ioctl. afu_ioctl_dma_map() accepts an unchecked 64-bit length, shifts it into a page count, and passes it to pin_user_pages_fast(), whose int parameter truncates oversized values. Access to an AFU port device and DFL hardware is required; successful exploitation elevates privileges or executes code in the kernel.
The record
- CVE
- CVE-2026-64280
- Published
- Jul 25, 2026
- Updated
- Jul 25, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-190, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 25, 2026CVE publishedPublication date reported by the CVE source.
- Jul 25, 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=4.19
- Affected versionversion=fa8dda1edef9ebc3af467c644c5533ac97171e12 <59070040fd12e0b78d7b4d341d9f9a183237c5ff
- Affected versionversion=fa8dda1edef9ebc3af467c644c5533ac97171e12 <fb2c0eab51ae5b02d2bae7d67c2cfbec39b57231
- Affected versionversion=fa8dda1edef9ebc3af467c644c5533ac97171e12 <fc3b071a7c8dc0f5d56defddf6e6fd5aaa3e1e27
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.
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
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo