CVE-2026-43464Network attack vector

Service interruption via mlx5e fragment undercount

Published May 8, 2026 · Updated May 8, 2026

Incorrect fragment accounting in affected Linux Kernel releases allows remote attackers to interrupt service through XDP multi-buffer traffic. The mlx5e legacy receive-queue path in en_rx.c fails to count an original fragment after bpf_xdp_pull_data() or bpf_xdp_adjust_tail() changes the buffer layout, producing a negative pp_ref_count during page release. Exposure requires an mlx5 legacy receive queue and an XDP multi-buffer program using those helpers; the documented consequence is a kernel warning and service interruption.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect fragment accounting in affected Linux Kernel releases allows remote attackers to interrupt service through XDP multi-buffer traffic. The mlx5e legacy receive-queue path in en_rx.c fails to count an original fragment after bpf_xdp_pull_data() or bpf_xdp_adjust_tail() changes the buffer layout, producing a negative pp_ref_count during page release. Exposure requires an mlx5 legacy receive queue and an XDP multi-buffer program using those helpers; the documented consequence is a kernel warning and service interruption.

The record

CVE
CVE-2026-43464
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=0049fd63881505566824e88cfa624638f921c808
  2. Affected versionversion=6.18
  3. Affected versionversion=72328f25755ee966724f46e3a0e8e59bef2091ba
  4. Affected versionversion=afd5ba577c10639f62e8120df67dc70ea4b61176 <03cb50e5b74fce8bf6d92b860371b66253cf0f8d
  5. Affected versionversion=afd5ba577c10639f62e8120df67dc70ea4b61176 <a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa
  6. Affected versionversion=afd5ba577c10639f62e8120df67dc70ea4b61176 <c74557495efb4bd0adefdfc8678ecdbc82a06da3
  7. Affected versionversion=d969645b9b7810289bf3c353ea06957373756b8e

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0049fd63881505566824e88cfa624638f921c808; version=6.18; version=72328f25755ee966724f46e3a0e8e59bef2091ba; version=afd5ba577c10639f62e8120df67dc70ea4b61176 <03cb50e5b74fce8bf6d92b860371b66253cf0f8d; version=afd5ba577c10639f62e8120df67dc70ea4b61176 <a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa; version=afd5ba577c10639f62e8120df67dc70ea4b61176 <c74557495efb4bd0adefdfc8678ecdbc82a06da3; version=d969645b9b7810289bf3c353ea06957373756b8e

Published CVSS scores

7.5kernel.orgCVSS: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 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

T1499Endpoint Denial of Service

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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