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CVE Record

CVE-2024-42132: bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX

In the Linux kernel, the following vulnerability has been resolved: bluetooth/hci: disallow setting handle bigger than HCI_CONN_HANDLE_MAX Syzbot hit warning in hci_conn_del() caused by freeing handle that was not allocated using ida allocator. This is caused by handle bigger than HCI_CONN_HANDLE_MAX passed by hci_le_big_sync_established_evt(), which makes code think it's unset connection. Add same check for handle upper bound as in hci_conn_set_handle() to prevent warning.

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 mishandle an invalid connection identifier, potentially disrupting an affected system and causing limited data or integrity impact. The 7.6 CVSS score reflects high availability risk. Exposure depends on the installed kernel and reachable Bluetooth functionality.

Executive priority

Treat as a high-priority maintenance issue for Bluetooth-enabled or mobile Linux assets. Expedite vendor-confirmed kernel updates, while validating exposure before broader emergency action because active exploitation is not evidenced.

Technical view

An out-of-range handle received by hci_le_big_sync_established_evt() can be treated as an unset connection. Consequently, hci_conn_del() may free a handle not allocated through the IDA allocator, triggering a warning. The stable fixes add HCI_CONN_HANDLE_MAX upper-bound validation.

Likely exposure

Linux systems with affected kernel builds and reachable Bluetooth HCI functionality are the likely exposure. The bundle lists 6.7, 6.6.39, 6.9.9, 6.10, and “0” as affected, but lacks complete range semantics. Downstream distribution exposure requires vendor confirmation.

Exploitation context

The supplied evidence does not support active exploitation, and the bundle marks KEV false. CVSS identifies an adjacent-network attack vector requiring neither privileges nor user interaction. Bluetooth proximity or equivalent adjacent access therefore materially affects practical risk.

Researcher notes

The description documents a syzbot-triggered warning involving an invalid handle and IDA allocation assumptions. It does not establish demonstrated exploitation or fully explain how the scored confidentiality, integrity, and availability impacts were reproduced. Avoid inferring memory corruption or remote code execution from this bundle alone.

Mitigation direction

  • Upgrade to a vendor-supported kernel containing the applicable Linux stable fix.
  • Check distribution advisories to map packaged kernel builds to the referenced fixes.
  • Prioritize remediation on Bluetooth-enabled systems exposed to untrusted nearby devices.
  • Follow vendor guidance if immediate upgrading is impossible; no alternative mitigation is supplied.

Validation and detection

  • Inventory kernel package versions across Bluetooth-capable Linux systems.
  • Confirm each vendor kernel incorporates an applicable referenced stable commit.
  • Determine whether Bluetooth HCI and LE BIG synchronization functionality are enabled or used.
  • Recheck kernel versions and vendor fix status after deployment.
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.

ATT&CK lookup starting points

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CVE-2024-42132 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
2ADP providers
5Source 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
7.6CVSS 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-2024-42132Attack 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
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxf7e83f2278f06b577e3c92ea2f4e8e8c6fc72a8f, 84cb0143fb8a03bf941c7aaedd56c938c99dafad, 181a42edddf51d5d9697ecdf365d72ebeab5afb0, 181a42edddf51d5d9697ecdf365d72ebeab5afb0, e9f708beada55426c8d678e2f46af659eb5bf4f0, 6.6.2, 6.5.12unaffected
LinuxLinux6.7, 0, 6.6.39, 6.9.9, 6.10affected
Weakness

CWE details

No CWE listed

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