CVE-2026-81002

Out-of-bounds write via zero-copy frame overlap

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds write in affected Linux kernels allows attackers to crash the system via an AF_XDP zero-copy packet redirected through cpumap. xdp_convert_zc_to_xdp_frame() advertises PAGE_SIZE and zero headroom, letting packet data overlap skb_shared_info or extend past its page. Reachability requires the AF_XDP zero-copy and cpumap redirect path; the demonstrated write caused a panic with KASAN panic_on_warn enabled.

CVSS severityUnavailable
Unscored
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in affected Linux kernels allows attackers to crash the system via an AF_XDP zero-copy packet redirected through cpumap. xdp_convert_zc_to_xdp_frame() advertises PAGE_SIZE and zero headroom, letting packet data overlap skb_shared_info or extend past its page. Reachability requires the AF_XDP zero-copy and cpumap redirect path; the demonstrated write caused a panic with KASAN panic_on_warn enabled.

The record

CVE
CVE-2026-81002
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=4.20
  2. Affected versionversion=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <15d1f3c0dbe7a740f779337deb39f23cd8d002c8
  3. Affected versionversion=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <444216dacdbebd3e52d5e704facafbb230da09e9
  4. Affected versionversion=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <68d7cc5512238693670fc19c7a615df631e10edf
  5. Affected versionversion=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <71283aaa6c65b3cec84caf1dc78560985737641f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <15d1f3c0dbe7a740f779337deb39f23cd8d002c8; version=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <444216dacdbebd3e52d5e704facafbb230da09e9; version=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <68d7cc5512238693670fc19c7a615df631e10edf; version=b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 <71283aaa6c65b3cec84caf1dc78560985737641f

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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