Kernel warning via premature I/O tagset iteration
Published Sep 24, 2026 · Updated Sep 24, 2026
Improper request cancellation in Linux before 6.12.111 or 6.18.53 allows local users to trigger a kernel warning during NVMe-FC recovery. During controller connection, __nvme_fc_abort_outstanding_ios() uses queue_count to iterate an I/O tagset that has not yet been created, while ioerr_work can race with tagset removal. Reachability requires an NVMe-FC controller, an admin-request timeout or connectivity loss in the CONNECTING state, and uninitialized I/O queues; the observed consequence is a lockdep warning that disables lock validation.
Summary
What happened
Improper request cancellation in Linux before 6.12.111 or 6.18.53 allows local users to trigger a kernel warning during NVMe-FC recovery. During controller connection, __nvme_fc_abort_outstanding_ios() uses queue_count to iterate an I/O tagset that has not yet been created, while ioerr_work can race with tagset removal. Reachability requires an NVMe-FC controller, an admin-request timeout or connectivity loss in the CONNECTING state, and uninitialized I/O queues; the observed consequence is a lockdep warning that disables lock validation.
The record
- CVE
- CVE-2026-97409
- Published
- Sep 24, 2026
- Updated
- Sep 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Sep 24, 2026CVE publishedPublication date reported by the CVE source.
- Sep 24, 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 <6.12.111
- Affected versionversion=0 <6.18.53
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da930308b4bc24c335574e85ca84ff70a988cf05
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dd39064d2948b14dbe4f364fe4b3c9cfc632cc21
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ee38469f88492df99e1d97f03aa40ecfd218934f
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