CVE-2026-72349

Incorrect traffic matching via truncated byte rates

Published Aug 15, 2026 · Updated Aug 15, 2026

Integer truncation in Linux kernel netfilter xt_rateest allows attackers to obtain incorrect rate comparisons via high-rate traffic. In xt_rateest_mt(), 64-bit byte-rate values are stored in 32-bit local operands, discarding high bits above 2^32-1 bytes per second. The faulty path requires an xt_rateest match on a link carrying more than about 34 Gbps; incorrect matches can misclassify traffic and disrupt policy enforcement.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer truncation in Linux kernel netfilter xt_rateest allows attackers to obtain incorrect rate comparisons via high-rate traffic. In xt_rateest_mt(), 64-bit byte-rate values are stored in 32-bit local operands, discarding high bits above 2^32-1 bytes per second. The faulty path requires an xt_rateest match on a link carrying more than about 34 Gbps; incorrect matches can misclassify traffic and disrupt policy enforcement.

The record

CVE
CVE-2026-72349
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
authenticated

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

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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=1c0d32fde5bdf1184bc274f864c09799278a1114 <444853cd438201007da5359821adcc2995655ab1
  2. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <5da915fc159c6b4091669447588e520183969cca
  3. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <77e9ba358d63fe2eb03c90d29ea85651d95cf2e6
  4. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <905a927b2e6fec7b174e9e5644d271047b61378f
  5. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <a3ba938f45cb00f6bf49d3aa3647df9b017f5f08
  6. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <bab305dd769d78074adca73505cc2509e1206bf2
  7. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b
  8. Affected versionversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <e702f6dd5d21e331f55fd9168c0210542008546d
  9. Affected versionversion=4.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1c0d32fde5bdf1184bc274f864c09799278a1114 <444853cd438201007da5359821adcc2995655ab1; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <5da915fc159c6b4091669447588e520183969cca; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <77e9ba358d63fe2eb03c90d29ea85651d95cf2e6; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <905a927b2e6fec7b174e9e5644d271047b61378f; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <a3ba938f45cb00f6bf49d3aa3647df9b017f5f08; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <bab305dd769d78074adca73505cc2509e1206bf2; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <d5cc4c12a4b90bf099199c3c49ecda7e694f2a2b; version=1c0d32fde5bdf1184bc274f864c09799278a1114 <e702f6dd5d21e331f55fd9168c0210542008546d; version=4.10

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.7SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

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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