CVE-2026-74476Network attack vector

Remote system crash via bogus XDP fragment metadata

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in the Linux kernel veth driver allows remote attackers to crash affected systems with crafted network traffic. veth_convert_skb_to_xdp_buff marks a frag_list socket buffer as fragmented from skb_is_nonlinear even when frags[] is empty, so AF_XDP copy mode walks an empty fragment entry during __xsk_rcv. The path requires a veth device running XDP with AF_XDP copy mode; triggering it crashes the kernel in memcpy and interrupts the host.

CVSS severity9.1
Critical
EPSS probability0.49%
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 veth driver allows remote attackers to crash affected systems with crafted network traffic. veth_convert_skb_to_xdp_buff marks a frag_list socket buffer as fragmented from skb_is_nonlinear even when frags[] is empty, so AF_XDP copy mode walks an empty fragment entry during __xsk_rcv. The path requires a veth device running XDP with AF_XDP copy mode; triggering it crashes the kernel in memcpy and interrupts the host.

The record

CVE
CVE-2026-74476
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
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

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=5.18
  2. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <5c1c15c540fc45820ce3033c319151ec891bc10a
  3. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb
  4. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <d0d6415963040c401e7a7e4e482a698ba52448cb
  5. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <f9c1fff857e93be709c8b52ed1a643f37bd82c66

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <5c1c15c540fc45820ce3033c319151ec891bc10a; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <b24ba0bbffe3e23eb2f6838881c1fabcb29fb9fb; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <d0d6415963040c401e7a7e4e482a698ba52448cb; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <f9c1fff857e93be709c8b52ed1a643f37bd82c66

Published CVSS scores

9.1Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
7.0OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499.004Endpoint Denial of Service: Application 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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