CVE-2026-23140

Local service interruption via oversized XDP metadata

Published Feb 14, 2026 · Updated Feb 14, 2026

Improper XDP metadata validation in Linux Kernel allows local users to interrupt service through BPF test-run live packet mode. The bpf_test_run path accepts metadata large enough to consume all XDP headroom, so xdp_update_frame_from_buff() fails and transmission proceeds with an uninitialized frame. Low-privilege local access and live packet mode are required; the documented impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper XDP metadata validation in Linux Kernel allows local users to interrupt service through BPF test-run live packet mode. The bpf_test_run path accepts metadata large enough to consume all XDP headroom, so xdp_update_frame_from_buff() fails and transmission proceeds with an uninitialized frame. Low-privilege local access and live packet mode are required; the documented impact is limited to availability.

The record

CVE
CVE-2026-23140
Published
Feb 14, 2026
Updated
Feb 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 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=5.18
  2. Affected versionversion=b6f1f780b3932ae497ed85e79bc8a1e513883624 <31e37f44b60679d90b9f999c91371b15291be8e0
  3. Affected versionversion=b6f1f780b3932ae497ed85e79bc8a1e513883624 <6447e697cfa8a43a8e491cb81bcc390d0f28f8ba
  4. Affected versionversion=b6f1f780b3932ae497ed85e79bc8a1e513883624 <7c81ad5e580bd8441f8a521a8d34824ce6582ae5
  5. Affected versionversion=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e558cca217790286e799a8baacd1610bda31b261
  6. Affected versionversion=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e7440935063949d6f2c10f7328d960d0ff4bce90

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.18; version=b6f1f780b3932ae497ed85e79bc8a1e513883624 <31e37f44b60679d90b9f999c91371b15291be8e0; version=b6f1f780b3932ae497ed85e79bc8a1e513883624 <6447e697cfa8a43a8e491cb81bcc390d0f28f8ba; version=b6f1f780b3932ae497ed85e79bc8a1e513883624 <7c81ad5e580bd8441f8a521a8d34824ce6582ae5; version=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e558cca217790286e799a8baacd1610bda31b261; version=b6f1f780b3932ae497ed85e79bc8a1e513883624 <e7440935063949d6f2c10f7328d960d0ff4bce90

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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