CVE-2026-74626Network attack vector

Reception denial via unreplenished RX queue

Published Aug 22, 2026 · Updated Aug 25, 2026

Denial of service in the Linux kernel ntb_netdev driver allows remote attackers to stall NTB packet reception via network traffic. The ntb_netdev_rx_handler function passes each received socket buffer upward before allocating a replacement, and an allocation failure leaves the RX slot empty with no refill path. The NTB link must already be active and repeated allocation failures must deplete its 100 receive slots; reception then remains stalled while the interface stays up.

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

Denial of service in the Linux kernel ntb_netdev driver allows remote attackers to stall NTB packet reception via network traffic. The ntb_netdev_rx_handler function passes each received socket buffer upward before allocating a replacement, and an allocation failure leaves the RX slot empty with no refill path. The NTB link must already be active and repeated allocation failures must deplete its 100 receive slots; reception then remains stalled while the interface stays up.

The record

CVE
CVE-2026-74626
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-826, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=3.9
  2. Affected versionversion=548c237c0a9972df5d1afaca38aa733ee577128d <755fd7843f300d724caceabdf9bb13adc8701540
  3. Affected versionversion=548c237c0a9972df5d1afaca38aa733ee577128d <a4e340971fe8ccd245d206db4d43b2a0eec240bd
  4. Affected versionversion=548c237c0a9972df5d1afaca38aa733ee577128d <d2121faf133ac3bf9531b53a7e21273649a08517

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=548c237c0a9972df5d1afaca38aa733ee577128d <755fd7843f300d724caceabdf9bb13adc8701540; version=548c237c0a9972df5d1afaca38aa733ee577128d <a4e340971fe8ccd245d206db4d43b2a0eec240bd; version=548c237c0a9972df5d1afaca38aa733ee577128d <d2121faf133ac3bf9531b53a7e21273649a08517

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5Linux CNACVSS:3.1/AV:N/AC:L/PR:N/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.

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

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-826Premature Release of Resource During Expected Lifetime
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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