CVE-2023-53035

Kernel memory disclosure via oversized NILFS2 metadata elements

Published May 2, 2025 · Updated May 11, 2026

Information disclosure in the NILFS2 ioctl path in Linux allows local users to read uninitialized kernel memory through read-only ioctls. nilfs_ioctl_wrap_copy allocates a page without clearing it, then copies user-sized records whose v_size exceeds the NILFS2 metadata structure, including untouched buffer bytes. Reachability requires local access to a NILFS2 filesystem and an oversized metadata element request; the consequence is bounded to memory disclosure.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the NILFS2 ioctl path in Linux allows local users to read uninitialized kernel memory through read-only ioctls. nilfs_ioctl_wrap_copy allocates a page without clearing it, then copies user-sized records whose v_size exceeds the NILFS2 metadata structure, including untouched buffer bytes. Reachability requires local access to a NILFS2 filesystem and an oversized metadata element request; the consequence is bounded to memory disclosure.

The record

CVE
CVE-2023-53035
Published
May 2, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=003ff182fddde09ddfb8d079bbdb02f9d2122082 <003587000276f81d0114b5ce773d80c119d8cb30
  2. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <5bb105cc72beb9d51bf12f5c657336d2d35bdc5d
  3. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <5f33b042f74fc9662eba17f4cd19b07d84bbc6c5
  4. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <8a6550b365c0ce2e65905de57dcbfe1f7d629726
  5. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <8f5cbf6a8c0e19b062b829c5b7aca01468bb57f6
  6. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <9c5034e9a0e03db8d5e9eabb176340259b5b97e4
  7. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <a94932381e8dae4117e9129b3c1282e18aa97b05
  8. Affected versionversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <d18db946cc6a394291539e030df32324285648f7
  9. Affected versionversion=2.6.31

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=003ff182fddde09ddfb8d079bbdb02f9d2122082 <003587000276f81d0114b5ce773d80c119d8cb30; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <5bb105cc72beb9d51bf12f5c657336d2d35bdc5d; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <5f33b042f74fc9662eba17f4cd19b07d84bbc6c5; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <8a6550b365c0ce2e65905de57dcbfe1f7d629726; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <8f5cbf6a8c0e19b062b829c5b7aca01468bb57f6; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <9c5034e9a0e03db8d5e9eabb176340259b5b97e4; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <a94932381e8dae4117e9129b3c1282e18aa97b05; version=003ff182fddde09ddfb8d079bbdb02f9d2122082 <d18db946cc6a394291539e030df32324285648f7; version=2.6.31

Published CVSS scores

5.5Amazon LinuxCVSS: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

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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

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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