CVE-2023-53463Network attack vector

Kernel crash via reset BQL counter mismatch

Published Oct 1, 2025 · Updated Oct 1, 2025

Denial of service in the Linux kernel ibmvnic driver allows remote attackers to crash affected systems through sustained network traffic. During NON_FATAL recovery, ibmvnic_open resets BQL's num_queued and num_completed counters without flushing partially filled transmit batches. On IBM Power systems using the virtual NIC, later transmit completion makes num_completed exceed num_queued and trips BUG_ON, causing a kernel panic.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel ibmvnic driver allows remote attackers to crash affected systems through sustained network traffic. During NON_FATAL recovery, ibmvnic_open resets BQL's num_queued and num_completed counters without flushing partially filled transmit batches. On IBM Power systems using the virtual NIC, later transmit completion makes num_completed exceed num_queued and trips BUG_ON, causing a kernel panic.

The record

CVE
CVE-2023-53463
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
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

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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=0d973388185d49add56b81ca82fa5e4348019df8 <48538ccb825b05544ec308a509e2cc9c013402db
  2. Affected versionversion=0d973388185d49add56b81ca82fa5e4348019df8 <91a0632e73070928aafeb36b3cc676843c716931
  3. Affected versionversion=0d973388185d49add56b81ca82fa5e4348019df8 <b8aedf29db1280c83191fc9579ae605791faf97f
  4. Affected versionversion=0d973388185d49add56b81ca82fa5e4348019df8 <f67ef8f9f6776e2b2073cad7c5cf29de850f83d7
  5. Affected versionversion=5.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0d973388185d49add56b81ca82fa5e4348019df8 <48538ccb825b05544ec308a509e2cc9c013402db; version=0d973388185d49add56b81ca82fa5e4348019df8 <91a0632e73070928aafeb36b3cc676843c716931; version=0d973388185d49add56b81ca82fa5e4348019df8 <b8aedf29db1280c83191fc9579ae605791faf97f; version=0d973388185d49add56b81ca82fa5e4348019df8 <f67ef8f9f6776e2b2073cad7c5cf29de850f83d7; version=5.11

Published CVSS scores

7.5LinuxCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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