CVE-2026-63872

Rejected identifier for withdrawn page-reference leak

Published Jul 19, 2026 · Updated Jul 19, 2026

CVE-2026-63872 is a rejected identifier; the Linux CNA withdrew its prior report of an ESP page-reference leak in the Linux kernel. The current CVE record contains only the rejection reason and no vulnerability description, affected versions, references, weakness, or severity assessment. The prior claim that esp_output_tail leaked old page-fragment references after a second skb_to_sgvec failure is historical data and no longer establishes an affected product or actionable vulnerability.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

CVE-2026-63872 is a rejected identifier; the Linux CNA withdrew its prior report of an ESP page-reference leak in the Linux kernel. The current CVE record contains only the rejection reason and no vulnerability description, affected versions, references, weakness, or severity assessment. The prior claim that esp_output_tail leaked old page-fragment references after a second skb_to_sgvec failure is historical data and no longer establishes an affected product or actionable vulnerability.

The record

CVE
CVE-2026-63872
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=4.11
  2. Affected versionversion=cac2661c53f35cbe651bef9b07026a5a05ab8ce0 <2982e599fff6faa21c8df147d96fc7af6c1a2f24
  3. Affected versionversion=cac2661c53f35cbe651bef9b07026a5a05ab8ce0 <e705b8ff4dd38fb8fe4e6fdc5378a86acea4feb5

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.11; version=cac2661c53f35cbe651bef9b07026a5a05ab8ce0 <2982e599fff6faa21c8df147d96fc7af6c1a2f24; version=cac2661c53f35cbe651bef9b07026a5a05ab8ce0 <e705b8ff4dd38fb8fe4e6fdc5378a86acea4feb5

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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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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