CVE-2023-53462

Host crash and disclosure via VLAN processing

Published Oct 1, 2025 · Updated Oct 1, 2025

Out-of-bounds read in the Linux kernel HSR driver allows adjacent attackers to crash hosts or disclose limited kernel data via VLAN frames. fill_frame_info() continues processing unsupported ETH_P_8021Q packets, reads beyond the Ethernet header into uninitialized skb data, and can forward those bytes. An HSR or PRP slave must already be active and reachable from the same Layer 2 segment; no account or user interaction is required.

CVSS severity7.1
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in the Linux kernel HSR driver allows adjacent attackers to crash hosts or disclose limited kernel data via VLAN frames. fill_frame_info() continues processing unsupported ETH_P_8021Q packets, reads beyond the Ethernet header into uninitialized skb data, and can forward those bytes. An HSR or PRP slave must already be active and reachable from the same Layer 2 segment; no account or user interaction is required.

The record

CVE
CVE-2023-53462
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=451d8123f89791bb628277c0bdb4cae34a3563e6 <1e90a93ac4845c31724ec5dc96fb51e608435a9d
  2. Affected versionversion=451d8123f89791bb628277c0bdb4cae34a3563e6 <484b4833c604c0adcf19eac1ca14b60b757355b5
  3. Affected versionversion=451d8123f89791bb628277c0bdb4cae34a3563e6 <61866f7d814e5792bf47410d7d3ff32e49bd292a
  4. Affected versionversion=451d8123f89791bb628277c0bdb4cae34a3563e6 <6a4480c5e6ebaf9f797ac300e2a97a02d4e70cfd
  5. Affected versionversion=451d8123f89791bb628277c0bdb4cae34a3563e6 <ed7a0ba7e840dc5d54cdbd8466be27e6aedce1e5
  6. Affected versionversion=5.9

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=451d8123f89791bb628277c0bdb4cae34a3563e6 <1e90a93ac4845c31724ec5dc96fb51e608435a9d; version=451d8123f89791bb628277c0bdb4cae34a3563e6 <484b4833c604c0adcf19eac1ca14b60b757355b5; version=451d8123f89791bb628277c0bdb4cae34a3563e6 <61866f7d814e5792bf47410d7d3ff32e49bd292a; version=451d8123f89791bb628277c0bdb4cae34a3563e6 <6a4480c5e6ebaf9f797ac300e2a97a02d4e70cfd; version=451d8123f89791bb628277c0bdb4cae34a3563e6 <ed7a0ba7e840dc5d54cdbd8466be27e6aedce1e5; version=5.9

Published CVSS scores

7.1Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
5.5UbuntuCVSS: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.

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo