CVE-2026-72399Network attack vector

Kernel crash via unchecked XDP fragment count

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds access in the Linux kernel ENETC XDP path allows remote attackers to corrupt memory through crafted network packets. The transmit path sizes xdp_redirect_arr for ENETC_MAX_SKB_FRAGS entries but indexes it using an xdp_frame fragment count that can meet or exceed that bound. The ENETC driver and XDP redirect processing must be in use; the resulting memory corruption can crash the kernel or enable code execution.

CVSS severity9.8
Critical
EPSS probability0.67%
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 access in the Linux kernel ENETC XDP path allows remote attackers to corrupt memory through crafted network packets. The transmit path sizes xdp_redirect_arr for ENETC_MAX_SKB_FRAGS entries but indexes it using an xdp_frame fragment count that can meet or exceed that bound. The ENETC driver and XDP redirect processing must be in use; the resulting memory corruption can crash the kernel or enable code execution.

The record

CVE
CVE-2026-72399
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-805
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=5.13
  2. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <1681cc7974a6123f5d5740b03bc11e4784bd2542
  3. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <1ecb199b0e6d12ab6c26c0b7edf1a8f4472d9aed
  4. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <555c5475e787802eeae0d2b91c2f66c330db2767
  5. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <cfbc6e9b84dcc0aa2d65c84ea4745af327763209
  6. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <d22829101ab675607ad6c3d420fb3ab875f46bbb
  7. Affected versionversion=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <f55276160ffad3e235b657ee4b7304eb99b90e5c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <1681cc7974a6123f5d5740b03bc11e4784bd2542; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <1ecb199b0e6d12ab6c26c0b7edf1a8f4472d9aed; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <555c5475e787802eeae0d2b91c2f66c330db2767; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <cfbc6e9b84dcc0aa2d65c84ea4745af327763209; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <d22829101ab675607ad6c3d420fb3ab875f46bbb; version=9d2b68cc108db2fdb35022ed2d88cfb305c441a6 <f55276160ffad3e235b657ee4b7304eb99b90e5c

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
9.8Canonical UbuntuCVSS: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-805Buffer Access with Incorrect Length Value

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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