Service hang via unbounded SPI status polling
Published Feb 26, 2025 · Updated May 11, 2026
Denial of service in Linux kernel 5.7 through 5.16.18 and 5.17 through 5.17.1 allows local users to hang SPI-FSI transfers. The fsi_spi_transfer_data routine polls TX and RX status bits without a timeout, so a controller that remains full or empty traps the transfer in an endless loop. Exploitation requires the SPI-FSI driver and attached FSI-connected SPI hardware; the documented consequence is a transfer hang, not data access or modification.
Summary
What happened
Denial of service in Linux kernel 5.7 through 5.16.18 and 5.17 through 5.17.1 allows local users to hang SPI-FSI transfers. The fsi_spi_transfer_data routine polls TX and RX status bits without a timeout, so a controller that remains full or empty traps the transfer in an endless loop. Exploitation requires the SPI-FSI driver and attached FSI-connected SPI hardware; the documented consequence is a transfer hang, not data access or modification.
The record
- CVE
- CVE-2022-49173
- Published
- Feb 26, 2025
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 26, 2025CVE publishedPublication date reported by the CVE source.
- May 11, 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=5.7
- Affected versionversion=bbb6b2f9865b3ed23eb457131b9ea541a3173a66 <89b35e3f28514087d3f1e28e8f5634fbfd07c554
- Affected versionversion=bbb6b2f9865b3ed23eb457131b9ea541a3173a66 <d4982ceb137e6ecd2b466a6de639790a148cf19a
- Affected versionversion=bbb6b2f9865b3ed23eb457131b9ea541a3173a66 <dac1438f347d3b8cf892105c94e254f29c5764de
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