CVE-2024-56596Public exploit

System interruption via unchecked JFS slot index

Published Dec 27, 2024 · Updated Aug 5, 2026

An out-of-bounds read in Linux JFS allows context-dependent attackers to interrupt the system through a malformed directory tree. jfs_readdir in fs/jfs/jfs_dtree.c uses each signed stbl entry directly as an index into a 128-slot directory page without first validating that it is between 0 and 127. Reachability requires a mounted JFS filesystem containing the malformed tree and a directory read; the demonstrated result is an out-of-bounds kernel access.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Linux JFS allows context-dependent attackers to interrupt the system through a malformed directory tree. jfs_readdir in fs/jfs/jfs_dtree.c uses each signed stbl entry directly as an index into a 128-slot directory page without first validating that it is between 0 and 127. Reachability requires a mounted JFS filesystem containing the malformed tree and a directory read; the demonstrated result is an out-of-bounds kernel access.

The record

CVE
CVE-2024-56596
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <839f102efb168f02dfdd46717b7c6dddb26b015e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8ff7579554571d92e3deab168f5a7d7b146ed368
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97e693593162eef6851d232f0c8148169ed46a5c
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9efe72eefd4c4a7ce63b3e4d667d766d2b360cb4
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62f41aeec9d250144c53875b507c1d45ae8c8fc
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7d376f94f72b020f84e77278b150ec1cc27502c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ff9fc48fab0e1ea0d423c23c99b91bba178f0b05
  8. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <839f102efb168f02dfdd46717b7c6dddb26b015e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8ff7579554571d92e3deab168f5a7d7b146ed368; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <97e693593162eef6851d232f0c8148169ed46a5c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9efe72eefd4c4a7ce63b3e4d667d766d2b360cb4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62f41aeec9d250144c53875b507c1d45ae8c8fc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7d376f94f72b020f84e77278b150ec1cc27502c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ff9fc48fab0e1ea0d423c23c99b91bba178f0b05; version=2.6.12

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499.004Application or System Exploitation

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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