Incorrect EOP ring configuration via integer underflow
Published Oct 6, 2026 · Updated Oct 6, 2026
Integer underflow in Linux drm/amdkfd produces an invalid EOP ring-size field for theoretically undersized queue buffers. The MQD update routine subtracts two from the result of ffs when setting cp_hqd_eop_control, which underflows if ffs returns zero or one. The upstream patch states that ring buffers cannot be smaller than 4096 bytes in practice; it establishes neither a reachable trigger nor a concrete security consequence.
Summary
What happened
Integer underflow in Linux drm/amdkfd produces an invalid EOP ring-size field for theoretically undersized queue buffers. The MQD update routine subtracts two from the result of ffs when setting cp_hqd_eop_control, which underflows if ffs returns zero or one. The upstream patch states that ring buffers cannot be smaller than 4096 bytes in practice; it establishes neither a reachable trigger nor a concrete security consequence.
The record
- CVE
- CVE-2026-98176
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 6, 2026CVE publishedPublication date reported by the CVE source.
- Oct 6, 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=0 <7.2.8
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82e1b8299c6da02ce02185c208d2fdf7572b5ea1
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c883d0a132d430ef7ebb23fd94323be94d0fbdb8
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.
Activity data is delayed. The latest report is Sep 28, 2026.
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
Get started to see how Hinoki identifies affected software and validates exploitability in your environment.
Get started