CVE-2026-72351Network attack vector

Out-of-bounds read via underlength GUE REMCSUM option

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in the Linux kernel GUE receive path allows remote attackers to access adjacent memory via malformed UDP packets. guehdr_priv_flags_len() returns zero for GUE_PFLAG_REMCSUM, so validate_gue_flags() accepts packets missing the REMCSUM start and offset fields. Processing requires a configured GUE receive path; subsequent parsing reads beyond the declared option data, resulting in information disclosure or a kernel crash.

CVSS severity9.8
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel GUE receive path allows remote attackers to access adjacent memory via malformed UDP packets. guehdr_priv_flags_len() returns zero for GUE_PFLAG_REMCSUM, so validate_gue_flags() accepts packets missing the REMCSUM start and offset fields. Processing requires a configured GUE receive path; subsequent parsing reads beyond the declared option data, resulting in information disclosure or a kernel crash.

The record

CVE
CVE-2026-72351
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1190
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

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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=3.19
  2. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <158b9995d3c87f3b93f5c22df54a12e12a3438b3
  3. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <2a99224c120823987e4d829726f4ecb33e03fc1e
  4. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <2c4de9988e9ddc760b750d6b6e701c35ff60ad14
  5. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <4a4a1d41c6e901e773bcf795f562a47fa71f692a
  6. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <61e78679c7c9ca685bff58e4b6348304dc60aafd
  7. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <7c6876ec1b227261b51803f784c7be1b2242a1a0
  8. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <d335dcc6f521571d57117b8deeebc940836e5450
  9. Affected versionversion=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <f618cbe9b24cd0202004d2db781d5f80ab77037f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.19; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <158b9995d3c87f3b93f5c22df54a12e12a3438b3; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <2a99224c120823987e4d829726f4ecb33e03fc1e; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <2c4de9988e9ddc760b750d6b6e701c35ff60ad14; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <4a4a1d41c6e901e773bcf795f562a47fa71f692a; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <61e78679c7c9ca685bff58e4b6348304dc60aafd; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <7c6876ec1b227261b51803f784c7be1b2242a1a0; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <d335dcc6f521571d57117b8deeebc940836e5450; version=c1aa8347e73e4092411fbd96cc59531fb7e76d04 <f618cbe9b24cd0202004d2db781d5f80ab77037f

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-125Out-of-bounds Read
T1190Exploit Public-Facing Application

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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