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CVE Record

CVE-2024-56590: Bluetooth: hci_core: Fix not checking skb length on hci_acldata_packet

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix not checking skb length on hci_acldata_packet This fixes not checking if skb really contains an ACL header otherwise the code may attempt to access some uninitilized/invalid memory past the valid skb->data.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux Bluetooth flaw can make the kernel read beyond valid packet data when handling a malformed ACL packet. A nearby, unauthenticated source could potentially disrupt the system and affect limited data confidentiality or integrity. Systems without Bluetooth exposure are less likely to be reachable.

Executive priority

Treat this as a high-priority kernel update for Bluetooth-enabled endpoints, appliances, and embedded systems. Accelerate remediation where nearby untrusted devices are plausible or outages would be costly. Validate applicability before emergency action because the supplied affected-version data is not sufficiently precise for reliable package-level decisions.

Technical view

The Linux Bluetooth HCI core failed to verify that an skb contained a complete ACL header before hci_acldata_packet accessed it. Processing undersized input could therefore reference uninitialized or invalid memory beyond skb->data. The supplied CVSS 3.1 score is 7.6, with adjacent-network access and high availability impact.

Likely exposure

Exposure is most plausible on affected Linux systems with Bluetooth hardware and Bluetooth functionality active or reachable. The source bundle lists Linux kernel versions from 2.6.12 through several later branches, but its version formatting is ambiguous. Confirm the applicable fixed build with the distribution or kernel vendor.

Exploitation context

The supplied record is not in CISA KEV, and the sources provided do not establish active exploitation or a public exploit. The CVSS vector indicates an adjacent attacker, no privileges, no user interaction, low complexity, and possible confidentiality, integrity, and availability effects.

Researcher notes

The defect is an skb length-validation failure in hci_acldata_packet before ACL-header access. Stable-kernel references show fixes across multiple branches. The bundle supplies no CWE, crash trace, exploit evidence, or precise affected-to-fixed version mapping; distribution backports should be assessed using vendor package guidance rather than upstream version numbers alone.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable fix.
  • Check distribution advisories for the exact fixed package and reboot requirements.
  • Prioritize Bluetooth-enabled systems in accessible or untrusted physical environments.
  • Where immediate patching is impossible, obtain vendor-approved exposure-reduction guidance.

Validation and detection

  • Inventory Linux kernel versions and identify systems with Bluetooth enabled.
  • Compare installed builds against distribution advisories and the referenced stable fixes.
  • Verify the running kernel changed after updating and rebooting.
  • Confirm scanners no longer flag CVE-2024-56590 after remediation.
Prepared
Confidence
high
Sources
8

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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CVE-2024-56590 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

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

1CVSS vectors
3Timeline events
1ADP providers
7Source links

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
7.6CVSS 3.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H2.84.7Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2024-56590Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

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

CWE details

No CWE listed

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