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CVE Record

CVE-2024-56596: jfs: fix array-index-out-of-bounds in jfs_readdir

In the Linux kernel, the following vulnerability has been resolved: jfs: fix array-index-out-of-bounds in jfs_readdir The stbl might contain some invalid values. Added a check to return error code in that case.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux’s JFS filesystem directory-reading code can access memory outside an intended array when filesystem metadata contains invalid values. Triggering requires local interaction with affected JFS content, but the supplied CVSS assessment indicates potentially serious confidentiality, integrity, and availability impact.

Executive priority

Prioritize affected systems that mount JFS or process externally supplied filesystem images. Treat internet-facing systems without JFS usage as lower practical urgency, while still applying normal kernel maintenance. Because version information in the supplied bundle is not sufficiently clear for package-level decisions, require vendor confirmation before closing remediation.

Technical view

CVE-2024-56596 is a CWE-129 array-index validation flaw in jfs_readdir. Invalid stbl entries can cause an out-of-bounds array access. The upstream correction validates these values and returns an error when they are invalid. The supplied data rates it CVSS 3.1 7.8 with local access, low complexity, no privileges, and user interaction.

Likely exposure

Exposure is most likely on systems running an affected Linux kernel where JFS is enabled and JFS directory data can be processed. Systems that never use JFS have substantially reduced practical exposure. The supplied version listing is ambiguous, so distribution-specific kernel status should be verified.

Exploitation context

The CVSS vector describes a local, low-complexity condition requiring user interaction but no privileges. The supplied sources do not establish a reliable exploitation method, public weaponization, or active exploitation. This CVE is not identified as present in KEV.

Researcher notes

The evidence establishes an out-of-bounds index caused by invalid stbl values in jfs_readdir and a validation-based upstream fix. It does not establish exploitability beyond the CVSS assessment or document observed attacks. Researchers should distinguish code presence from reachability through an enabled, mounted, or processed JFS filesystem.

Mitigation direction

  • Install the vendor-supported kernel update that includes the applicable upstream JFS correction.
  • Check Linux distribution advisories for the exact fixed package version.
  • Where operationally acceptable, avoid mounting or processing untrusted JFS filesystems until updated.
  • Restrict untrusted users and workflows from introducing JFS images or media.

Validation and detection

  • Inventory kernel versions and determine which systems enable or use JFS.
  • Compare installed kernel packages with distribution advisories and upstream stable fixes.
  • Confirm updated systems booted into the corrected kernel, not an older installed kernel.
  • Review filesystem mounts and image-processing workflows for exposure to untrusted JFS content.
  • Monitor kernel logs for JFS errors or memory-safety reports.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-129: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2024-56596 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
3Timeline events
2ADP providers
10Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Linux
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-56596Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 5.4.287, 5.10.231, 5.15.174, 6.1.120, 6.6.66, 6.12.5, 6.13affected
Weakness

CWE details

CWE-129

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.