CVE-2023-54127Public exploit

Kernel memory compromise via stale JFS bmap pointer

Published Dec 24, 2025 · Updated Dec 24, 2025

Double-free in the Linux kernel JFS remount path allows local users to corrupt kernel memory through a crafted JFS image. dbUnmount frees the in-memory bmap but leaves the superblock pointer non-NULL, so a failed dbMount or diMount during jfs_remount causes a later remount or unmount to free the same allocation again. Reaching the flaw requires local filesystem operations on attacker-controlled JFS media; successful exploitation grants kernel-memory read or write access or crashes the system.

CVSS severity7.8
High
EPSS probability0.16%
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 remount path allows local users to corrupt kernel memory through a crafted JFS image. dbUnmount frees the in-memory bmap but leaves the superblock pointer non-NULL, so a failed dbMount or diMount during jfs_remount causes a later remount or unmount to free the same allocation again. Reaching the flaw requires local filesystem operations on attacker-controlled JFS media; successful exploitation grants kernel-memory read or write access or crashes the system.

The record

CVE
CVE-2023-54127
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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 <2f7a36448f51d08d3a83f1514abcca4b680bcd3c
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <798c5f6f98bc9045593d4b3a65c32f05d97bd0e6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aef6507e85475e30831c30405d785c7ed976ea4a
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b12ccbfdf6539ef0157868f69fcae0b7f7a072b3
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cade5397e5461295f3cb87880534b6a07cafa427
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f7a36448f51d08d3a83f1514abcca4b680bcd3c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f8b34458948ffca2fe90cd8c614e3fa2ebe0b27; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <798c5f6f98bc9045593d4b3a65c32f05d97bd0e6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa5b019a3e0f7f54f4e5370c1af827f6b00fd26b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aef6507e85475e30831c30405d785c7ed976ea4a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b12ccbfdf6539ef0157868f69fcae0b7f7a072b3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cade5397e5461295f3cb87880534b6a07cafa427; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f71c4bb3ec08dfcbd201350a6a0a914c4e6a9e3f

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 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 exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

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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