CVE-2026-80647

Kernel warning via direct-mode CQ reset callback

Published Aug 28, 2026 · Updated Aug 28, 2026

Improper callback invocation in Linux 5.5 and later allows attackers to trigger a kernel warning during an HNS RoCE device reset. hns_roce_cq_completion calls the completion handler of an ib_alloc_cq direct-mode completion queue even though that handler must not run in direct mode, reaching ib_cq_completion_direct and its WARN_ONCE. Reachability requires the HNS RoCE driver, a direct-mode completion queue, and a device reset; published evidence documents the warning but no crash, data access, or privilege gain.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper callback invocation in Linux 5.5 and later allows attackers to trigger a kernel warning during an HNS RoCE device reset. hns_roce_cq_completion calls the completion handler of an ib_alloc_cq direct-mode completion queue even though that handler must not run in direct mode, reaching ib_cq_completion_direct and its WARN_ONCE. Reachability requires the HNS RoCE driver, a direct-mode completion queue, and a device reset; published evidence documents the warning but no crash, data access, or privilege gain.

The record

CVE
CVE-2026-80647
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

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5
  2. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <16138ea9833d6bb1bed37a3321f282242704bf02
  3. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <1e56f8886d64288cf88d80af44c7b9148aeaa98b
  4. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <3f19c2a3852e6ba75f3e92dd5edc4e07f3d07f4a
  5. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <95b2e44bc1e5c5d93bb58e178d914dd99a3baa6f
  6. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <9f05319149c14acedb83e2c2842ec4b38992ad9f
  7. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <a075a7acd155ffdd058e72eb3f4cce1207ebafa1
  8. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <c028c1977b6e61eee26bb69332453efb6513f83b
  9. Affected versionversion=f295e4cece5cb4c60715fed539abcd62468f9ef1 <e7d363c0ffa836ac1d89657686cad241392c5eb2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.5; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <16138ea9833d6bb1bed37a3321f282242704bf02; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <1e56f8886d64288cf88d80af44c7b9148aeaa98b; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <3f19c2a3852e6ba75f3e92dd5edc4e07f3d07f4a; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <95b2e44bc1e5c5d93bb58e178d914dd99a3baa6f; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <9f05319149c14acedb83e2c2842ec4b38992ad9f; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <a075a7acd155ffdd058e72eb3f4cce1207ebafa1; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <c028c1977b6e61eee26bb69332453efb6513f83b; version=f295e4cece5cb4c60715fed539abcd62468f9ef1 <e7d363c0ffa836ac1d89657686cad241392c5eb2

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

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

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Your stack

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