CVE-2023-53667

Kernel panic via undersized CDC transmit allocation

Published Oct 7, 2025 · Updated Oct 7, 2025

Denial of service in the Linux kernel cdc_ncm driver allows local users to trigger a kernel panic through a low USB CDC NCM size value. cdc_ncm_check_tx_max accepts a positive dwNtbOutMaxSize below the required minimum, and cdc_ncm_fill_tx_frame allocates an undersized socket buffer before appending CDC data. Access to a USB CDC NCM device that reports the low value is required; the resulting bounds check panics the kernel and interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.14%
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

Denial of service in the Linux kernel cdc_ncm driver allows local users to trigger a kernel panic through a low USB CDC NCM size value. cdc_ncm_check_tx_max accepts a positive dwNtbOutMaxSize below the required minimum, and cdc_ncm_fill_tx_frame allocates an undersized socket buffer before appending CDC data. Access to a USB CDC NCM device that reports the low value is required; the resulting bounds check panics the kernel and interrupts the host.

The record

CVE
CVE-2023-53667
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=289507d3364f96f4b8814726917d572f71350d87 <2334ff0b343ba6ba7a6c0586fcc83992bbbc1776
  2. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <42b78c8cc774b47023d6d16d96d54cc7015e4a07
  3. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <6147745d43ff4e0d2c542e5b93e398ef0ee4db00
  4. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <72d0240b0ee4794efc683975c213e4b384fea733
  5. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <7e01c7f7046efc2c7c192c3619db43292b98e997
  6. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <9be921854e983a81a0aeeae5febcd87093086e46
  7. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <bf415bfe7573596ac213b4fd1da9e62cfc9a9413
  8. Affected versionversion=289507d3364f96f4b8814726917d572f71350d87 <ff484163dfb61b58f23e4dbd007de1094427669c
  9. Affected versionversion=3.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=289507d3364f96f4b8814726917d572f71350d87 <2334ff0b343ba6ba7a6c0586fcc83992bbbc1776; version=289507d3364f96f4b8814726917d572f71350d87 <42b78c8cc774b47023d6d16d96d54cc7015e4a07; version=289507d3364f96f4b8814726917d572f71350d87 <6147745d43ff4e0d2c542e5b93e398ef0ee4db00; version=289507d3364f96f4b8814726917d572f71350d87 <72d0240b0ee4794efc683975c213e4b384fea733; version=289507d3364f96f4b8814726917d572f71350d87 <7e01c7f7046efc2c7c192c3619db43292b98e997; version=289507d3364f96f4b8814726917d572f71350d87 <9be921854e983a81a0aeeae5febcd87093086e46; version=289507d3364f96f4b8814726917d572f71350d87 <bf415bfe7573596ac213b4fd1da9e62cfc9a9413; version=289507d3364f96f4b8814726917d572f71350d87 <ff484163dfb61b58f23e4dbd007de1094427669c; version=3.16

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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

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