CVE-2026-93109Hinoki check available

Invalid callback execution via undrained RCU callbacks

Published Sep 17, 2026 · Updated Sep 17, 2026

Linux 5.6 RDMA/mlx5 teardown races allow attackers to trigger invalid callback execution when the mlx5_ib module unloads. The cleanup paths in drivers/infiniband/hw/mlx5/main.c fail to drain queued devx_free_subscription() RCU callbacks before module code disappears, including during registration-error unwinding. Exposure requires the affected driver and teardown with pending callbacks; the public sources do not establish attacker privileges, a specific crash outcome, or arbitrary code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Linux 5.6 RDMA/mlx5 teardown races allow attackers to trigger invalid callback execution when the mlx5_ib module unloads. The cleanup paths in drivers/infiniband/hw/mlx5/main.c fail to drain queued devx_free_subscription() RCU callbacks before module code disappears, including during registration-error unwinding. Exposure requires the affected driver and teardown with pending callbacks; the public sources do not establish attacker privileges, a specific crash outcome, or arbitrary code execution.

The record

CVE
CVE-2026-93109
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=5.6
  2. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <2f946e7839f677fa14574b6babad14b37ae0bbbe
  3. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <4664368b9bd9d5d79ebad24056b98c34b9fed20f
  4. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <4be7810ba70291abb2f68cc6db0ae1b93ee9c76a
  5. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <59d60e04afd012f07e996d2e34cb90a4ec6f5cff
  6. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <7babc25d8dd5b7642920fbc0737cfd1469e7025b
  7. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <ca428e597f12b278bf158356e34641e6386cfa82
  8. Affected versionversion=6898d1c661d79f4707d8ba82991b2195822780ca <e37cdd75f8d61c1123d324ae5667ac3da562290e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=6898d1c661d79f4707d8ba82991b2195822780ca <2f946e7839f677fa14574b6babad14b37ae0bbbe; version=6898d1c661d79f4707d8ba82991b2195822780ca <4664368b9bd9d5d79ebad24056b98c34b9fed20f; version=6898d1c661d79f4707d8ba82991b2195822780ca <4be7810ba70291abb2f68cc6db0ae1b93ee9c76a; version=6898d1c661d79f4707d8ba82991b2195822780ca <59d60e04afd012f07e996d2e34cb90a4ec6f5cff; version=6898d1c661d79f4707d8ba82991b2195822780ca <7babc25d8dd5b7642920fbc0737cfd1469e7025b; version=6898d1c661d79f4707d8ba82991b2195822780ca <ca428e597f12b278bf158356e34641e6386cfa82; version=6898d1c661d79f4707d8ba82991b2195822780ca <e37cdd75f8d61c1123d324ae5667ac3da562290e

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
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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