CVE-2023-53661

Local service interruption via NVRAM length overflow

Published Oct 7, 2025 · Updated Oct 7, 2025

Integer overflow in the Linux kernel bnxt driver allows local users to interrupt service through an NVRAM directory request. The bnxt_get_nvram_directory function multiplies device-reported dir_entries by entry_length as 32-bit values, allowing wraparound to understate the DMA buffer length. Reachability requires local low-privileged access and a system using the Broadcom bnxt driver; published sources do not specify the interruption mode.

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

Integer overflow in the Linux kernel bnxt driver allows local users to interrupt service through an NVRAM directory request. The bnxt_get_nvram_directory function multiplies device-reported dir_entries by entry_length as 32-bit values, allowing wraparound to understate the DMA buffer length. Reachability requires local low-privileged access and a system using the Broadcom bnxt driver; published sources do not specify the interruption mode.

The record

CVE
CVE-2023-53661
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, 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

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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 <17e0453a7523ad7a25bb47af941b150a6c66d7b6
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c6dddc239abe660598c49ec95ea0ed6399a4b2a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5eaf2a6b077f32a477feb1e9e1c1f60605b460e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efb1a257513438d43f4335f09b2f684e8167cad2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <17e0453a7523ad7a25bb47af941b150a6c66d7b6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c6dddc239abe660598c49ec95ea0ed6399a4b2a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5eaf2a6b077f32a477feb1e9e1c1f60605b460e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <efb1a257513438d43f4335f09b2f684e8167cad2

Published CVSS scores

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.

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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-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

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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