CVE-2026-74612Network attack vector

Kernel-memory disclosure via stale skb length accounting

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds read in the Linux veth driver allows remote attackers to expose kernel memory and corrupt UDP data via crafted packets. The veth_xdp_rcv_skb() path replaces skb->data_len after an XDP fragment shrink without removing the old fragment contribution from skb->len, so __skb_datagram_iter() reads beyond the true linear tail. Exposure requires a reachable veth peer with an XDP program already attached; the mismatch can disclose kernel metadata and pointers, truncate packet data, or trigger a kernel assertion and crash.

CVSS severity10.0
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 veth driver allows remote attackers to expose kernel memory and corrupt UDP data via crafted packets. The veth_xdp_rcv_skb() path replaces skb->data_len after an XDP fragment shrink without removing the old fragment contribution from skb->len, so __skb_datagram_iter() reads beyond the true linear tail. Exposure requires a reachable veth peer with an XDP program already attached; the mismatch can disclose kernel metadata and pointers, truncate packet data, or trigger a kernel assertion and crash.

The record

CVE
CVE-2026-74612
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=5.18
  2. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <0c3024afabb8064b141f3cedcb1ddd6ab05ad9d5
  3. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <2f2a7f3f8b9f1bffc9b0488aa02b6951b2aec139
  4. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <3205b0652a37255dbb7ca8f3d942c8d8aa677c21
  5. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <41b96667d42b74bb4b137f1bb78b611a953c5943
  6. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <cb6379feaaff11c4e1e79c26c745ffa23182768a
  7. Affected versionversion=718a18a0c8a67f97781e40bdef7cdd055c430996 <cdf745b7a777f87f51666e5d8f4c6fc279bcf54d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <0c3024afabb8064b141f3cedcb1ddd6ab05ad9d5; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <2f2a7f3f8b9f1bffc9b0488aa02b6951b2aec139; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <3205b0652a37255dbb7ca8f3d942c8d8aa677c21; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <41b96667d42b74bb4b137f1bb78b611a953c5943; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <cb6379feaaff11c4e1e79c26c745ffa23182768a; version=718a18a0c8a67f97781e40bdef7cdd055c430996 <cdf745b7a777f87f51666e5d8f4c6fc279bcf54d

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
10.0Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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

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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