Boot-time kernel warning via vmemmap unit mismatch
Published Aug 28, 2026 · Updated Aug 28, 2026
Memory alignment error in Linux 7.1 on RISC-V systems causes a boot-time kernel warning when sparse memory initialization checks vmemmap. The RISC-V VMEMMAP_ADDR_ALIGN macro passes MAX_FOLIO_VMEMMAP_ALIGN, measured in struct page bytes, directly to physical-address rounding. Exposure requires CONFIG_SPARSEMEM_VMEMMAP and a DRAM base not aligned to MAX_FOLIO_NR_PAGES times PAGE_SIZE, as on QEMU virt; published evidence shows a startup warning but no attacker-controlled crash or data access.
Summary
What happened
Memory alignment error in Linux 7.1 on RISC-V systems causes a boot-time kernel warning when sparse memory initialization checks vmemmap. The RISC-V VMEMMAP_ADDR_ALIGN macro passes MAX_FOLIO_VMEMMAP_ALIGN, measured in struct page bytes, directly to physical-address rounding. Exposure requires CONFIG_SPARSEMEM_VMEMMAP and a DRAM base not aligned to MAX_FOLIO_NR_PAGES times PAGE_SIZE, as on QEMU virt; published evidence shows a startup warning but no attacker-controlled crash or data access.
The record
- CVE
- CVE-2026-80682
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 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=476849b0fba4450f5adf22196bcff9c24c673bc4 <11ad86830a78ea4e1942afc73c10e4ca8e69e03f
- Affected versionversion=476849b0fba4450f5adf22196bcff9c24c673bc4 <45ebe4540817cb540a59e4dc04014ac5dddc9990
- Affected versionversion=7.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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
No sourced classifications are available.
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