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CVE Record

CVE-2024-47723: jfs: fix out-of-bounds in dbNextAG() and diAlloc()

In the Linux kernel, the following vulnerability has been resolved: jfs: fix out-of-bounds in dbNextAG() and diAlloc() In dbNextAG() , there is no check for the case where bmp->db_numag is greater or same than MAXAG due to a polluted image, which causes an out-of-bounds. Therefore, a bounds check should be added in dbMount(). And in dbNextAG(), a check for the case where agpref is greater than bmp->db_numag should be added, so an out-of-bounds exception should be prevented. Additionally, a check for the case where agno is greater or same than MAXAG should be added in diAlloc() to prevent out-of-bounds.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A malformed or corrupted JFS filesystem image can make the Linux kernel access memory outside expected boundaries. An attacker with local, low-privilege access could potentially affect system confidentiality, integrity, and availability. This is not described as a remote, unauthenticated vulnerability.

Executive priority

Treat as a high-priority kernel maintenance issue on systems using JFS, especially shared hosts or appliances processing filesystem images. It is less urgent than an unauthenticated remote flaw because local access and JFS-related conditions are required. Schedule prompt patching through supported vendor channels.

Technical view

Invalid JFS allocation-group metadata can trigger out-of-bounds access in dbNextAG() and diAlloc(). The kernel fixes validate db_numag during dbMount(), check agpref against db_numag, and reject agno values at or above MAXAG. CVSS 3.1 is 7.8: local access, low complexity, low privileges, no user interaction, and high impact.

Likely exposure

Exposure is most likely where affected Linux kernels use JFS or process polluted JFS filesystem images. The supplied version data spans multiple kernel branches but does not provide reliable distribution-package mappings. Systems not using JFS have substantially reduced practical exposure, though administrators should confirm configuration and vendor status.

Exploitation context

The supplied record requires local access and low privileges. It does not establish a remote attack path. CISA KEV status is false, and no supplied source reports active exploitation or public weaponization. Practical exploitation conditions beyond polluted JFS metadata are not documented here.

Researcher notes

The vulnerable paths trust allocation-group values derived from polluted JFS metadata. Remediation adds three boundary validations covering db_numag, agpref, and agno. The sources do not identify a CWE, demonstrated exploit, crash signature, or precise distribution package matrix; validate those details through relevant vendors.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable JFS fix, then reboot into it.
  • Check distribution and appliance vendor advisories for package-specific fixed versions.
  • Restrict untrusted users from supplying or mounting JFS filesystem images where operationally feasible.
  • Prioritize exposed multi-user systems and appliances confirmed to use JFS.

Validation and detection

  • Inventory running kernel versions and identify systems with JFS enabled, mounted, or accepted as input.
  • Compare each kernel package against its distribution advisory and the applicable upstream stable fix.
  • After updating, confirm the running kernel changed and the superseded vulnerable kernel is not active.
  • Review vendor advisories for embedded products that may bundle affected Linux kernels.
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.

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CVE-2024-47723 mapping review

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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:L/UI:N/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.

1CVSS vectors
3Timeline events
3ADP providers
14Source links

SSVC decision data

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

CVSS vector scores

1 official score

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:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-47723Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
other:ssvc
CVECVE Program Container
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2, 6.12affected
Weakness

CWE details

No CWE listed

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