CVE-2026-99045

Unspecified impact via premature buffer-list unmapping

Published Oct 23, 2026 · Updated Oct 23, 2026

Incorrect cleanup in Linux ibmveth allows attackers to cause unspecified impact when opening a virtual Ethernet interface fails. On RX-pool allocation failure, ibmveth_open() unmaps the buffer-list page without deregistering the logical LAN, leaving PHYP ownership intact. The path requires the IBM virtual Ethernet driver and an allocation failure after LAN registration; attacker control and concrete security consequences are not documented.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect cleanup in Linux ibmveth allows attackers to cause unspecified impact when opening a virtual Ethernet interface fails. On RX-pool allocation failure, ibmveth_open() unmaps the buffer-list page without deregistering the logical LAN, leaving PHYP ownership intact. The path requires the IBM virtual Ethernet driver and an allocation failure after LAN registration; attacker control and concrete security consequences are not documented.

The record

CVE
CVE-2026-99045
Published
Oct 23, 2026
Updated
Oct 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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=4.13
  2. Affected versionversion=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <a065bd31ec462f6f9c267026b708dd020f122723
  3. Affected versionversion=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <af0524bf4ce1a4cbd2946aa81751582951cfcab5
  4. Affected versionversion=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <c54bbdf6f0731102a4bf7f5e4ee535b3ea415996
  5. Affected versionversion=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <d24fdec1413c656d29298097926e77542785ca0c
  6. Affected versionversion=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <decb4d4ead2c71ef698727734ab5024a872eb372

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.13; version=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <a065bd31ec462f6f9c267026b708dd020f122723; version=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <af0524bf4ce1a4cbd2946aa81751582951cfcab5; version=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <c54bbdf6f0731102a4bf7f5e4ee535b3ea415996; version=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <d24fdec1413c656d29298097926e77542785ca0c; version=d43732ce021f4244a4c53a45d57ad0c13c30ed94 <decb4d4ead2c71ef698727734ab5024a872eb372

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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