CVE-2026-74523Network attack vector

Networking control-plane hang via recovery self-deadlock

Published Aug 15, 2026 · Updated Aug 15, 2026

Deadlock in the Linux kernel qede driver allows remote attackers to hang the host networking control plane after a TX timeout. During qede recovery, udp_tunnel_nic_reset_ntf reaches qede_udp_tunnel_sync, which attempts to reacquire the nonrecursive qede_lock already held by the same worker. A qede NIC with VXLAN or GENEVE tunnel ports must be configured; the worker retains rtnl_lock indefinitely, blocking networking-control tasks while the node can still answer ping.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel qede driver allows remote attackers to hang the host networking control plane after a TX timeout. During qede recovery, udp_tunnel_nic_reset_ntf reaches qede_udp_tunnel_sync, which attempts to reacquire the nonrecursive qede_lock already held by the same worker. A qede NIC with VXLAN or GENEVE tunnel ports must be configured; the worker retains rtnl_lock indefinitely, blocking networking-control tasks while the node can still answer ping.

The record

CVE
CVE-2026-74523
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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.

  1. Affected versionversion=5.9
  2. Affected versionversion=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <451c9075d6c53f2438d110addbeeeea6fac18567
  3. Affected versionversion=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <4626df3f63c9185efba5750fe76ac01ab3351bae
  4. Affected versionversion=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27
  5. Affected versionversion=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <e382a4efeeae6555b95d9ff336cf3094ee7d336b
  6. Affected versionversion=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <e51becb8f3377a377171ed5bf0082b96e22e6292

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <451c9075d6c53f2438d110addbeeeea6fac18567; version=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <4626df3f63c9185efba5750fe76ac01ab3351bae; version=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <6f1ef8170d3d8ad9319aa01347945dcdf5cc4f27; version=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <e382a4efeeae6555b95d9ff336cf3094ee7d336b; version=8cd160a29415f1789d473b1dc07fcc9d02a02b87 <e51becb8f3377a377171ed5bf0082b96e22e6292

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-833Deadlock
T1499Endpoint Denial of Service

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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