CVE-2023-53524

Privileged heap overflow via truncated read count

Published Oct 1, 2025 · Updated May 11, 2026

Integer overflow in the Linux kernel before 6.4 allows local users with root-only debugfs access to trigger a heap overflow. iwl_write_to_user_buf narrows a user-supplied ssize_t count to int, turns SIZE_MAX into a negative length, and passes it to copy_to_user. The monitor-data file has mode 0400, so only a privileged local user can exercise the path; the kernel CVE team states that the bug is not a security vulnerability.

CVSS severity7.8
High
EPSS probability0.17%
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 before 6.4 allows local users with root-only debugfs access to trigger a heap overflow. iwl_write_to_user_buf narrows a user-supplied ssize_t count to int, turns SIZE_MAX into a negative length, and passes it to copy_to_user. The monitor-data file has mode 0400, so only a privileged local user can exercise the path; the kernel CVE team states that the bug is not a security vulnerability.

The record

CVE
CVE-2023-53524
Published
Oct 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=5.0
  2. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <059e426d666a41e26b184c177c1ca3ee2d6fa1b6
  3. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <0ad8dd870aa187d0c21d032bb2c6433559075eec
  4. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <58d1b717879bfeabe09b35e41ad667c79933eb2e
  5. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <82f877ec9b041edc4c7c509c605cc3393d837bf0
  6. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <de78456976026102babe66258c228691ca5677c0
  7. Affected versionversion=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <eb1ef44efac797b384d361a76e33f77027c29a14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.0; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <059e426d666a41e26b184c177c1ca3ee2d6fa1b6; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <0ad8dd870aa187d0c21d032bb2c6433559075eec; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <58d1b717879bfeabe09b35e41ad667c79933eb2e; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <82f877ec9b041edc4c7c509c605cc3393d837bf0; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <de78456976026102babe66258c228691ca5677c0; version=f7805b33f9b13a87b1fcf9dfbc3dcbce281a1436 <eb1ef44efac797b384d361a76e33f77027c29a14

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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