CVE-2023-53616

Kernel memory corruption via stale JFS pointer

Published Oct 4, 2025 · Updated Oct 4, 2025

Double free in the Linux kernel JFS implementation allows local users with mount authority to corrupt kernel memory through a crafted volume. If diMount fails during a read-only-to-read-write remount, jfs_remount frees JFS_IP(ipimap)->i_imap but leaves the pointer non-NULL, so diUnmount frees the same allocation again. A user must control a JFS image and its mount, remount, and unmount sequence; exploitation can crash the kernel or corrupt privileged memory.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux kernel JFS implementation allows local users with mount authority to corrupt kernel memory through a crafted volume. If diMount fails during a read-only-to-read-write remount, jfs_remount frees JFS_IP(ipimap)->i_imap but leaves the pointer non-NULL, so diUnmount frees the same allocation again. A user must control a JFS image and its mount, remount, and unmount sequence; exploitation can crash the kernel or corrupt privileged memory.

The record

CVE
CVE-2023-53616
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <114ea3cb13ab25f7178cb60283adb93d2f96dad7
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4de3a603010e0ca334487de24c6aab0777b7f808
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5873df0195124be2f357de11bfd473ead4f90ed8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e2bda2c192d0244b5a78b787ef20aa10cb319b7
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <756747d4b439e3e1159282ae89f17eefebbe9b25
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88484bde6f12126616b38e43b6c00edcd941f615
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3c0f0ddd851b3fa3e9d3450bbcd561f4f850469
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef7311101ca43dd73b45bca7a30ac72d9535ff87

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <114ea3cb13ab25f7178cb60283adb93d2f96dad7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4de3a603010e0ca334487de24c6aab0777b7f808; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5873df0195124be2f357de11bfd473ead4f90ed8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e2bda2c192d0244b5a78b787ef20aa10cb319b7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <756747d4b439e3e1159282ae89f17eefebbe9b25; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <88484bde6f12126616b38e43b6c00edcd941f615; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c3c0f0ddd851b3fa3e9d3450bbcd561f4f850469; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef7311101ca43dd73b45bca7a30ac72d9535ff87

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

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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