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CVE Record

CVE-2024-38587: speakup: Fix sizeof() vs ARRAY_SIZE() bug

In the Linux kernel, the following vulnerability has been resolved: speakup: Fix sizeof() vs ARRAY_SIZE() bug The "buf" pointer is an array of u16 values. This code should be using ARRAY_SIZE() (which is 256) instead of sizeof() (which is 512), otherwise it can the still got out of bounds.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2024-38587 is a Linux kernel bug in the speakup accessibility component. A size calculation used bytes instead of array elements, allowing an out-of-bounds condition. The published impact is limited to availability, not data theft or integrity compromise.

Executive priority

Treat this as routine-to-important patch management, not an emergency incident unless exposed business-critical Linux systems are behind on kernel updates. The main risk described is service disruption, and there is no provided evidence of active exploitation.

Technical view

The speakup code treated a u16 buffer pointer with sizeof(), producing 512 instead of the intended ARRAY_SIZE() value of 256. The Linux stable fixes replace the incorrect bound. CVSS 3.1 is 5.3 with network attack vector and low complexity, but the bundle does not describe exploit mechanics.

Likely exposure

Exposure is tied to Linux systems running affected kernel versions listed in the CVE record, including several stable series. Systems using vendor kernels should be assessed through their distribution advisories, because backport status may differ from upstream version strings.

Exploitation context

The source bundle says this is not in KEV, and no provided source claims active exploitation. Public evidence here supports a kernel availability issue with upstream stable fixes and a Debian LTS announcement, not a known exploited vulnerability.

Researcher notes

The record is specific about the coding error and fixed upstream commits, but sparse on reachable attack surface. Validate whether speakup is present, built, or enabled in target kernels before estimating practical exposure.

Mitigation direction

  • Update affected Linux kernels using distribution or vendor security updates.
  • Prioritize internet-facing or appliance-like systems where kernel updates lag.
  • Check Debian LTS and device vendor advisories for backported fixes.
  • Track Siemens advisories if affected Siemens products are in inventory.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded devices.
  • Compare deployed kernels with the CVE affected and fixed version data.
  • Confirm vendor advisory status for distribution-specific or backported kernels.
  • Verify updated systems are running the remediated kernel after reboot.
Prepared
Confidence
medium
Sources
12

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.

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CVE-2024-38587 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
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

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

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
13Source 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
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L3.91.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2024-38587Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux756c5cb7c09e537b87b5d3acafcb101b2ccf394f, 8f6b62125befe1675446923e4171eac2c012959c, 6401038acfa24cba9c28cce410b7505efadd0222, 0d130158db29f5e0b3893154908cf618896450a8, 89af25bd4b4bf6a71295f07e07a8ae7dc03c6595, 8defb1d22ba0395b81feb963b96e252b097ba76f, 0efb15c14c493263cb3a5f65f5ddfd4603d19a76, c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1, c8d2f34ea96ea3bce6ba2535f867f0d4ee3b22e1unaffected
LinuxLinux6.9, 0, 4.19.316, 5.4.278, 5.10.219, 5.15.161, 6.1.93, 6.6.33, 6.8.12, 6.9.3, 6.10affected
Weakness

CWE details

No CWE listed

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