Service interruption via irdma queue-depth overflow
Published Apr 22, 2026 · Updated Apr 22, 2026
Integer overflow in the Linux Kernel irdma driver allows local users to interrupt service via oversized SQ, RQ, or SRQ requests. SQ, RQ, and SRQ depth calculations in drivers/infiniband/hw/irdma/uk.c use 32-bit arithmetic that overflows or truncates a U32_MAX size and incorrectly returns success. Low-privilege local access, an affected kernel, and the irdma RDMA path are required; the public record does not distinguish a hang, crash, or reboot.
Summary
What happened
Integer overflow in the Linux Kernel irdma driver allows local users to interrupt service via oversized SQ, RQ, or SRQ requests. SQ, RQ, and SRQ depth calculations in drivers/infiniband/hw/irdma/uk.c use 32-bit arithmetic that overflows or truncates a U32_MAX size and incorrectly returns success. Low-privilege local access, an affected kernel, and the irdma RDMA path are required; the public record does not distinguish a hang, crash, or reboot.
The record
- CVE
- CVE-2026-31491
- Published
- Apr 22, 2026
- Updated
- Apr 22, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-190, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 22, 2026CVE publishedPublication date reported by the CVE source.
- Apr 22, 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=563e1feb5f6ed579acb55850f1bbb831aecf645a <3f08351de5ca4f2f724b86ad252fbc21289467e1
- Affected versionversion=563e1feb5f6ed579acb55850f1bbb831aecf645a <cbd852f5700eb3f64392452faf693ac45cae8281
- Affected versionversion=563e1feb5f6ed579acb55850f1bbb831aecf645a <e37afcb56ae070477741fe2d6e61fc0c542cce2d
- Affected versionversion=6.18
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