CVE-2026-90109Hinoki check available

Memory exhaustion via 32-bit queue admission overflow

Published Sep 17, 2026 · Updated Sep 17, 2026

Integer overflow in Linux traffic queues allows local users with root privileges to exhaust kernel memory via queued traffic. The gred_enqueue(), bfifo_enqueue(), and plug_enqueue() functions add backlog and packet length in 32 bits, letting wrapped values bypass queue limits. Reproduction requires root-configured limits near 4 GiB and more than 4 GiB of queued traffic, with the default virtual queue unconfigured for gred; the documented result is out-of-memory exhaustion, not a specified crash or reboot.

CVSS severity4.4
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integer overflow in Linux traffic queues allows local users with root privileges to exhaust kernel memory via queued traffic. The gred_enqueue(), bfifo_enqueue(), and plug_enqueue() functions add backlog and packet length in 32 bits, letting wrapped values bypass queue limits. Reproduction requires root-configured limits near 4 GiB and more than 4 GiB of queued traffic, with the default virtual queue unconfigured for gred; the documented result is out-of-memory exhaustion, not a specified crash or reboot.

The record

CVE
CVE-2026-90109
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.001
Attack vector
local
Privileges
admin

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=4.2
  2. Affected versionversion=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <3fb51b3960342bbee563543f8d33710fd0fb5a96
  3. Affected versionversion=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <4c660ee8c809637909f4f7eb1017f7b9401c75c4
  4. Affected versionversion=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <8b2d8c70b969bf84f9e248bfaf2a7135129f2eb6
  5. Affected versionversion=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <d98b92f3d57976ae185238946ec5ea0be32195aa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <3fb51b3960342bbee563543f8d33710fd0fb5a96; version=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <4c660ee8c809637909f4f7eb1017f7b9401c75c4; version=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <8b2d8c70b969bf84f9e248bfaf2a7135129f2eb6; version=a3eb95f891d6130b1fc03dd07a8b54cf0a5c8ab8 <d98b92f3d57976ae185238946ec5ea0be32195aa

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.4SUSECVSS:3.1/AV:L/AC:L/PR:H/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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

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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