CVE-2023-53432

Kernel compromise via freed packet-buffer dereference

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in Linux kernel 2.6.31 through pre-fix branch releases allows adjacent attackers to compromise the kernel. fwnet_finish_incoming_packet() calls netif_rx(), which transfers or frees the packet buffer, and then reads skb->len through the stale pointer. Reachability requires an active firewire-net interface and an attacker-controlled peer on the shared IEEE 1394 bus; exploitation can expose or alter kernel memory or crash the host.

CVSS severity8.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel 2.6.31 through pre-fix branch releases allows adjacent attackers to compromise the kernel. fwnet_finish_incoming_packet() calls netif_rx(), which transfers or frees the packet buffer, and then reads skb->len through the stale pointer. Reachability requires an active firewire-net interface and an attacker-controlled peer on the shared IEEE 1394 bus; exploitation can expose or alter kernel memory or crash the host.

The record

CVE
CVE-2023-53432
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ff256751a2853e1ffaa36958ff933ccc98c6cb5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9040adc38cf6bfbb77034d558ac2c52f70d840ac
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9860921ab4521252dc39bb21b9c936bd09a00982

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3ff256751a2853e1ffaa36958ff933ccc98c6cb5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9040adc38cf6bfbb77034d558ac2c52f70d840ac; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9860921ab4521252dc39bb21b9c936bd09a00982

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

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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