CVE-2023-53456

Kernel heap disclosure via unchecked netlink attributes

Published Oct 1, 2025 · Updated Oct 1, 2025

Out-of-bounds reads in the Linux qla4xxx SCSI driver allow local users to disclose kernel heap data through malformed netlink attributes. The qla4xxx_set_chap_entry(), qla4xxx_iface_set_param(), and qla4xxx_sysfs_ddb_set_param() paths cast attributes to structures without first validating their lengths. Exploitation requires local low-privileged access and the qla4xxx driver path; returned bytes can contain residual heap data.

CVSS severity6.9
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in the Linux qla4xxx SCSI driver allow local users to disclose kernel heap data through malformed netlink attributes. The qla4xxx_set_chap_entry(), qla4xxx_iface_set_param(), and qla4xxx_sysfs_ddb_set_param() paths cast attributes to structures without first validating their lengths. Exploitation requires local low-privileged access and the qla4xxx driver path; returned bytes can contain residual heap data.

The record

CVE
CVE-2023-53456
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
local
Privileges
authenticated

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=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <25feffb3fbd51ae81d92c65cebc0e932663828b3
  2. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <47cd3770e31df942e2bb925a9a855c79ed0662eb
  3. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <47f3be62eab50b8cd7e1ae5fc2c4dae687497c34
  4. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <4ed21975311247bb84e82298eeb359ec0a0fa84d
  5. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <5925e224cc6edfef57b20447f18323208461309b
  6. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <6d65079c69dc1feb817ed71f5bd15e83a7d6832d
  7. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <b018c0440b871d8b001c996e95fa4538bd292de6
  8. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <cfa6a1a79ed6d336fac7a5d87eb5471e4401829f
  9. Affected versionversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <f61fc650c47849637fa1771a31a11674c824138a
  10. Affected versionversion=3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <25feffb3fbd51ae81d92c65cebc0e932663828b3; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <47cd3770e31df942e2bb925a9a855c79ed0662eb; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <47f3be62eab50b8cd7e1ae5fc2c4dae687497c34; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <4ed21975311247bb84e82298eeb359ec0a0fa84d; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <5925e224cc6edfef57b20447f18323208461309b; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <6d65079c69dc1feb817ed71f5bd15e83a7d6832d; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <b018c0440b871d8b001c996e95fa4538bd292de6; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <cfa6a1a79ed6d336fac7a5d87eb5471e4401829f; version=00c31889f7513e9ffa6b2b4de8ad6d7f59a61c80 <f61fc650c47849637fa1771a31a11674c824138a; version=3.2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

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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