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CVE Record

CVE-2024-26952: ksmbd: fix potencial out-of-bounds when buffer offset is invalid

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix potencial out-of-bounds when buffer offset is invalid I found potencial out-of-bounds when buffer offset fields of a few requests is invalid. This patch set the minimum value of buffer offset field to ->Buffer offset to validate buffer length.

HighCVSS 8.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in the Linux kernel's ksmbd SMB file server can let a low-privileged network user submit invalid buffer offsets, potentially exposing kernel memory or disrupting the system. Integrity impact is assessed as limited. Risk is concentrated on systems actively using ksmbd and reachable by untrusted or compromised SMB accounts.

Executive priority

Prioritize remediation for reachable ksmbd servers, especially those handling sensitive data or accessible by many accounts. Other Linux systems are lower priority until ksmbd use is confirmed. No active exploitation is established by the supplied sources, but the potential confidentiality and availability consequences justify prompt, risk-based patching.

Technical view

CVE-2024-26952 is a CWE-125 out-of-bounds read caused by insufficient validation of buffer-offset fields in several ksmbd requests. The kernel fixes this by enforcing a minimum buffer-offset value before validating buffer length. CVSS 3.1 is 8.3: network-accessible, low complexity, low privileges required, no user interaction, with high confidentiality and availability impacts.

Likely exposure

Likely exposure is limited to Linux systems running ksmbd and accepting SMB requests from low-privileged users. The bundle associates affected status with multiple 5.15 through 6.9 releases, but its version representation is ambiguous; distribution package status and the relevant stable-kernel commits should determine exposure.

Exploitation context

The supplied record does not list this CVE in KEV and provides no cited evidence of active exploitation. The CVSS vector indicates exploitation requires network access and low privileges, without user interaction. Treat reachable ksmbd services and compromised SMB credentials as the primary risk context.

Researcher notes

The public description identifies invalid buffer offsets across several request types but does not establish practical exploit reliability or name those requests in the supplied text. The duplicated commit identifier and ambiguous affected-version list reduce precision. Validate branch-specific exposure against the six stable-kernel commits and distribution advisories; do not infer remote unauthenticated exploitation because CVSS specifies low privileges.

Mitigation direction

  • Install the vendor-supported kernel update containing the relevant stable-kernel fix.
  • Prioritize internet-facing or broadly reachable systems running ksmbd.
  • Restrict SMB access to trusted networks and authorized accounts while updates are pending.
  • Disable ksmbd where SMB service is unnecessary, following vendor operational guidance.

Validation and detection

  • Confirm whether ksmbd is enabled and serving SMB connections.
  • Inventory kernel and distribution package versions on systems using ksmbd.
  • Compare installed packages with vendor advisories and the referenced stable-kernel fixes.
  • Verify the updated kernel is active after installation and reboot.
  • Review SMB exposure and account permissions for unnecessary access.
Prepared
Confidence
medium
Sources
9

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

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cwe · low confidence lookup

CWE-125: Exact CWE lookup

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cve · low confidence lookup

CVE-2024-26952 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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
8Source 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
8.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H2.85.5Linux
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

8.3High
CVSS 3.1 vector shape for CVE-2024-26952Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/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
LinuxLinux0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cf, 0626e6641f6b467447c81dd7678a69c66f7746cfunaffected
LinuxLinux5.15, 0, 5.15.181, 6.1.119, 6.6.32, 6.7.12, 6.8.3, 6.9affected
Weakness

CWE details

CWE-125

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

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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