CVE-2023-52596

Service interruption via empty sysctl registration

Published Mar 6, 2024 · Updated May 11, 2026

Out-of-bounds access in Linux kernel 6.6 through 6.6.15 and 6.7 through 6.7.3 allows local users to interrupt service via empty sysctl registration. The permanent-empty-directory check in fs/proc/proc_sysctl.c evaluates the first ctl_table element without first ensuring that the table contains an element. Local low-privileged access is required; published sources do not identify the user action that reaches registration, and no data impact is reported.

CVSS severity5.5
Medium
EPSS probability0.23%
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 access in Linux kernel 6.6 through 6.6.15 and 6.7 through 6.7.3 allows local users to interrupt service via empty sysctl registration. The permanent-empty-directory check in fs/proc/proc_sysctl.c evaluates the first ctl_table element without first ensuring that the table contains an element. Local low-privileged access is required; published sources do not identify the user action that reaches registration, and no data impact is reported.

The record

CVE
CVE-2023-52596
Published
Mar 6, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2024CVE 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

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=6.6
  2. Affected versionversion=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <15893975e9e382f8294ea8d926f08dc2d8d39ede
  3. Affected versionversion=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <2ae7081bc10123b187e36a4f3a8e53768de31489
  4. Affected versionversion=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <315552310c7de92baea4e570967066569937a843

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <15893975e9e382f8294ea8d926f08dc2d8d39ede; version=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <2ae7081bc10123b187e36a4f3a8e53768de31489; version=9edbfe92a0a1355bae1e47c8f542ac0d39f19f8c <315552310c7de92baea4e570967066569937a843

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-787Out-of-bounds Write

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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