CVE-2026-99127Public exploit

Kernel panic via misaligned shared packet fragments

Published Oct 28, 2026 · Updated Oct 28, 2026

Alignment failure in Linux page_pool allows attackers to crash the kernel via UDP traffic on configured x86 systems. page_pool_alloc_frag_netmem() advances the shared fragment offset by odd packet lengths without ensuring skb_shared_info alignment, making later skb_clone() atomic accesses cross cache-line boundaries. The demonstrated trigger requires generic XDP on loopback, a raw UDP socket that causes packet cloning, and fatal kernel split-lock detection.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Alignment failure in Linux page_pool allows attackers to crash the kernel via UDP traffic on configured x86 systems. page_pool_alloc_frag_netmem() advances the shared fragment offset by odd packet lengths without ensuring skb_shared_info alignment, making later skb_clone() atomic accesses cross cache-line boundaries. The demonstrated trigger requires generic XDP on loopback, a raw UDP socket that causes packet cloning, and fatal kernel split-lock detection.

The record

CVE
CVE-2026-99127
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=5.15
  2. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <813a72beaa5d3f4bb135e0def9b3f07a3511ca0e
  3. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <dc0df5a0c62ccea1d0e08d39a4dc9064de81d411
  4. Affected versionversion=53e0961da1c7bbdabd1abebb20de403ec237ec09 <dca1b51693c81eaf77e50980be373e01ae857394

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <813a72beaa5d3f4bb135e0def9b3f07a3511ca0e; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <dc0df5a0c62ccea1d0e08d39a4dc9064de81d411; version=53e0961da1c7bbdabd1abebb20de403ec237ec09 <dca1b51693c81eaf77e50980be373e01ae857394

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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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