CVE-2026-74742Public exploitNetwork attack vector

Network service interruption via wrong TX queue wakeup

Published Aug 26, 2026 · Updated Aug 26, 2026

Improper queue-index handling in affected Linux kernels allows remote attackers to indefinitely stall traffic on nonzero veth transmit queues. On the plain GRO/NAPI path, veth_poll reads an XDP-only queue_index that remains zero and wakes peer queue 0 instead of the queue it drained. Exploitation requires a multi-queue veth pair with GRO, no attached XDP program, a non-noqueue qdisc, and sustained traffic that fills a nonzero ptr_ring; the stopped queue has no watchdog recovery.

CVSS severity7.5
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper queue-index handling in affected Linux kernels allows remote attackers to indefinitely stall traffic on nonzero veth transmit queues. On the plain GRO/NAPI path, veth_poll reads an XDP-only queue_index that remains zero and wakes peer queue 0 instead of the queue it drained. Exploitation requires a multi-queue veth pair with GRO, no attached XDP program, a non-noqueue qdisc, and sustained traffic that fills a nonzero ptr_ring; the stopped queue has no watchdog recovery.

The record

CVE
CVE-2026-74742
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1285, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=6.12.61 <6.12.105
  2. Affected versionversion=6.16
  3. Affected versionversion=9fe31b3f314534e238aa6d0b6fb492134cbcf8be <b662a1fb4f3a5ea19bac24eea8315b1d05be51e7
  4. Affected versionversion=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <60db47f02bfa2aa688938aa199117ec4f8e31d23
  5. Affected versionversion=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <73f8dd22b1e533a99ecc3f9b5de6c6daccaecace
  6. Affected versionversion=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <90bb11fb29d3c55a2c46dc7c386d096b286e7fcf

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12.61 <6.12.105; version=6.16; version=9fe31b3f314534e238aa6d0b6fb492134cbcf8be <b662a1fb4f3a5ea19bac24eea8315b1d05be51e7; version=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <60db47f02bfa2aa688938aa199117ec4f8e31d23; version=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <73f8dd22b1e533a99ecc3f9b5de6c6daccaecace; version=dc82a33297fc2c58cb0b2b008d728668d45c0f6a <90bb11fb29d3c55a2c46dc7c386d096b286e7fcf

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
T1499.004Application or System Exploitation

Public exploit references

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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