CVE-2026-53086Network attack vector

Network transmit lockup via cross-queue timeout recovery

Published Jun 24, 2026 · Updated Jun 24, 2026

Race condition in the Linux Kernel bcmgenet driver allows remote attackers to lock all transmit queues via sustained network traffic. The bcmgenet_timeout handler responds to one timed-out queue by reclaiming descriptors, re-enabling interrupts, and waking every transmit queue while other queues remain active. Reachability requires an active bcmgenet interface and traffic that times out one queue while others are transmitting; the resulting races can lock the interface's entire transmit path.

CVSS severity9.8
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux Kernel bcmgenet driver allows remote attackers to lock all transmit queues via sustained network traffic. The bcmgenet_timeout handler responds to one timed-out queue by reclaiming descriptors, re-enabling interrupts, and waking every transmit queue while other queues remain active. Reachability requires an active bcmgenet interface and traffic that times out one queue while others are transmitting; the resulting races can lock the interface's entire transmit path.

The record

CVE
CVE-2026-53086
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=13ea657806cf73b379a0109f7042182f47c351a7 <5393b2b5bee2ac51a0043dc7f4ac3475f053d08d
  2. Affected versionversion=13ea657806cf73b379a0109f7042182f47c351a7 <681fdfe823b4f1036ed50b58b8838c7917ea389c
  3. Affected versionversion=13ea657806cf73b379a0109f7042182f47c351a7 <7ce1c26aac3b318886a57425f64b522da7389153
  4. Affected versionversion=13ea657806cf73b379a0109f7042182f47c351a7 <c270e2bec3e55a716d25c35341091339457ac883
  5. Affected versionversion=13ea657806cf73b379a0109f7042182f47c351a7 <e8206538cbaf4f4068e99a4cb1138690a1e00499
  6. Affected versionversion=13ea657806cf73b379a0109f7042182f47c351a7 <e85b0c0a12e967930044608311471b665baa315c
  7. Affected versionversion=4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=13ea657806cf73b379a0109f7042182f47c351a7 <5393b2b5bee2ac51a0043dc7f4ac3475f053d08d; version=13ea657806cf73b379a0109f7042182f47c351a7 <681fdfe823b4f1036ed50b58b8838c7917ea389c; version=13ea657806cf73b379a0109f7042182f47c351a7 <7ce1c26aac3b318886a57425f64b522da7389153; version=13ea657806cf73b379a0109f7042182f47c351a7 <c270e2bec3e55a716d25c35341091339457ac883; version=13ea657806cf73b379a0109f7042182f47c351a7 <e8206538cbaf4f4068e99a4cb1138690a1e00499; version=13ea657806cf73b379a0109f7042182f47c351a7 <e85b0c0a12e967930044608311471b665baa315c; version=4.2

Published CVSS scores

9.8Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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