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CVE Record

CVE-2024-46780: nilfs2: protect references to superblock parameters exposed in sysfs

In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect references to superblock parameters exposed in sysfs The superblock buffers of nilfs2 can not only be overwritten at runtime for modifications/repairs, but they are also regularly swapped, replaced during resizing, and even abandoned when degrading to one side due to backing device issues. So, accessing them requires mutual exclusion using the reader/writer semaphore "nilfs->ns_sem". Some sysfs attribute show methods read this superblock buffer without the necessary mutual exclusion, which can cause problems with pointer dereferencing and memory access, so fix it.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A locking flaw in Linux’s nilfs2 filesystem lets certain sysfs status reads race with superblock replacement or removal. This can leave the kernel using an unsafe reference and cause invalid memory access. The issue requires local, low-privileged access according to the CVSS vector; it is not described as remotely exploitable. Potential impact spans confidentiality, integrity, and availability.

Executive priority

Treat this as a high-priority kernel maintenance issue on multi-user or shared-compute systems using nilfs2. Accelerate remediation where untrusted users or workloads have local access. Other systems should follow normal expedited kernel patching after confirming nilfs2 exposure and vendor package status.

Technical view

nilfs2 superblock buffers can be overwritten, swapped during resizing, replaced, or abandoned after backing-device degradation. Some sysfs attribute show methods read those buffers without holding the nilfs->ns_sem reader/writer semaphore. Concurrent lifecycle changes can therefore produce unsafe pointer dereferences and memory access. The supplied record scores this CVSS 3.1 7.8: AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Likely exposure

Exposure is most likely on systems running a listed affected Linux kernel where nilfs2 is in use and its sysfs attributes are accessible. The supplied version data is kernel-oriented and does not establish distribution package fix boundaries. Systems not using nilfs2 are less likely to reach the vulnerable path, but administrators should confirm with their vendor.

Exploitation context

The supplied bundle marks KEV false and provides no evidence of active exploitation or a public proof of concept. The vector indicates a local, low-complexity, low-privilege attack requiring no user interaction. Real-world reliability and prerequisites beyond nilfs2 and concurrent superblock activity are not established here.

Researcher notes

The record describes a missing synchronization control around sysfs reads of mutable nilfs2 superblock buffers. Referenced stable-kernel commits provide the correction. No CWE, proof of concept, crash trace, exploitation telemetry, or distribution-wide fixed-package matrix is supplied. The duplicated commit identifiers and mixed version entries should not be treated as reliable package-level boundaries.

Mitigation direction

  • Apply a distribution kernel update incorporating the referenced stable-kernel fix, then reboot into the updated kernel.
  • Confirm package-specific fixed versions with the Linux distribution or vendor advisory before rollout.
  • Prioritize hosts that use nilfs2 and permit untrusted local accounts or workloads.
  • Use vendor-recommended temporary mitigations if patching is delayed; none are identified in the supplied bundle.

Validation and detection

  • Inventory running kernel versions and identify systems using or loading nilfs2.
  • Map each kernel package to its distribution advisory or a referenced fixed stable commit.
  • After updating, verify each host booted the intended fixed kernel.
  • Recheck nilfs2-dependent workloads and monitor kernel logs for memory-access faults.
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-2024-46780 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
2ADP providers
11Source 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-2024-46780Attack 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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxda7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53, da7141fb78db915680616e15677539fc8140cf53unaffected
LinuxLinux3.17, 0, 4.19.322, 5.4.284, 5.10.226, 5.15.167, 6.1.110, 6.6.51, 6.10.10, 6.11affected
Weakness

CWE details

No CWE listed

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