CVE-2026-23451Network attack vector

Remote system hang via recursive header parsing

Published Apr 3, 2026 · Updated Apr 3, 2026

Infinite recursion in Linux Kernel bonding allows remote attackers to hang affected systems via a received network packet. bond_header_parse() reuses skb->dev, which remains the top bond, so dev_parse_header() repeatedly selects the same bonding parser instead of descending to the leaf device. Exploitation requires a stacked bonding hierarchy and an active AF_PACKET, NFLOG, or NFQUEUE hardware-address parsing path.

CVSS severity7.5
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite recursion in Linux Kernel bonding allows remote attackers to hang affected systems via a received network packet. bond_header_parse() reuses skb->dev, which remains the top bond, so dev_parse_header() repeatedly selects the same bonding parser instead of descending to the leaf device. Exploitation requires a stacked bonding hierarchy and an active AF_PACKET, NFLOG, or NFQUEUE hardware-address parsing path.

The record

CVE
CVE-2026-23451
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-835, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=6ac890f1d60ac3707ee8dae15a67d9a833e49956 <4172a7901cf43fe1cc63ef7a2ef33735ff7b7d13
  2. Affected versionversion=7.0-rc4
  3. Affected versionversion=950803f7254721c1c15858fbbfae3deaaeeecb11 <b7405dcf7385445e10821777143f18c3ce20fa04
  4. Affected versionversion=95597d11dc8bddb2b9a051c9232000bfbb5e43ba <9b49c854f14f5e2d493e562a1e28d2e57fe37371
  5. Affected versionversion=9baf26a91565b7bb2b1d9f99aaf884a2b28c2f6d <946bb6cacf0ccada7bc80f1cfa07c1ed79511c1c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6ac890f1d60ac3707ee8dae15a67d9a833e49956 <4172a7901cf43fe1cc63ef7a2ef33735ff7b7d13; version=7.0-rc4; version=950803f7254721c1c15858fbbfae3deaaeeecb11 <b7405dcf7385445e10821777143f18c3ce20fa04; version=95597d11dc8bddb2b9a051c9232000bfbb5e43ba <9b49c854f14f5e2d493e562a1e28d2e57fe37371; version=9baf26a91565b7bb2b1d9f99aaf884a2b28c2f6d <946bb6cacf0ccada7bc80f1cfa07c1ed79511c1c

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499Endpoint Denial of Service

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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