CVE-2023-53061

Service interruption via leaked ACL references

Published May 2, 2025 · Updated May 11, 2026

Resource leak in the Linux kernel allows local users to interrupt service through ksmbd SMB2 open operations after allocation failure. In smb2_open(), the ACL conversion allocation-failure path returns without calling posix_acl_release(), leaving an ACL reference unreleased. Exploitation requires low-privileged local access and a memory allocation failure; public sources do not establish that users can force the failure.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the Linux kernel allows local users to interrupt service through ksmbd SMB2 open operations after allocation failure. In smb2_open(), the ACL conversion allocation-failure path returns without calling posix_acl_release(), leaving an ACL reference unreleased. Exploitation requires low-privileged local access and a memory allocation failure; public sources do not establish that users can force the failure.

The record

CVE
CVE-2023-53061
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 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=5.15
  2. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <2624b445544ffc1472ccabfb6ec867c199d4c95c
  3. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <303f8e58cc3ace744801dcdcabfc06ffc72ed62d
  4. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a22c49a05e5e7aa2c414fbc42c49c4c01a5c9a78
  5. Affected versionversion=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c33344b7972225b232966f95d31f6312dcc6273d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <2624b445544ffc1472ccabfb6ec867c199d4c95c; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <303f8e58cc3ace744801dcdcabfc06ffc72ed62d; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <a22c49a05e5e7aa2c414fbc42c49c4c01a5c9a78; version=e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <c33344b7972225b232966f95d31f6312dcc6273d

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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