CVE-2023-53312

Service interruption via unchecked transport offset

Published Sep 16, 2025 · Updated Sep 16, 2025

Improper offset handling in the Linux kernel allows local users to trigger a kernel warning during network packet transmission. The net_dev_start_xmit trace event calls skb_transport_offset() even when skb_transport_header_was_set() is false, causing a WARN when an skb lacks a transport header. Exploitation requires low-privileged local access and an active trace event; panic_on_warn converts the warning into a kernel panic and service interruption.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper offset handling in the Linux kernel allows local users to trigger a kernel warning during network packet transmission. The net_dev_start_xmit trace event calls skb_transport_offset() even when skb_transport_header_was_set() is false, causing a WARN when an skb lacks a transport header. Exploitation requires low-privileged local access and an active trace event; panic_on_warn converts the warning into a kernel panic and service interruption.

The record

CVE
CVE-2023-53312
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.19
  2. Affected versionversion=66e4c8d950083df8e12981babca788e1635c92b6 <58f9e88eb247263c74383b4ee8858abac15cdbe0
  3. Affected versionversion=66e4c8d950083df8e12981babca788e1635c92b6 <ced61418f46993d571385812bafed3a7d4ab6918
  4. Affected versionversion=66e4c8d950083df8e12981babca788e1635c92b6 <f88fcb1d7d961b4b402d675109726f94db87571c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=66e4c8d950083df8e12981babca788e1635c92b6 <58f9e88eb247263c74383b4ee8858abac15cdbe0; version=66e4c8d950083df8e12981babca788e1635c92b6 <ced61418f46993d571385812bafed3a7d4ab6918; version=66e4c8d950083df8e12981babca788e1635c92b6 <f88fcb1d7d961b4b402d675109726f94db87571c

Published CVSS scores

5.5CISACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

CWE-401Missing Release of Memory after Effective Lifetime
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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