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CVE Record

CVE-2024-35966: Bluetooth: RFCOMM: Fix not validating setsockopt user input

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Fix not validating setsockopt user input syzbot reported rfcomm_sock_setsockopt_old() is copying data without checking user input length. BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt_old net/bluetooth/rfcomm/sock.c:632 [inline] BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt+0x893/0xa70 net/bluetooth/rfcomm/sock.c:673 Read of size 4 at addr ffff8880209a8bc3 by task syz-executor632/5064

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-35966 is a Linux kernel Bluetooth RFCOMM bug where user-provided socket option data was copied without first checking its length. The reported failure is an out-of-bounds kernel read found by syzbot/KASAN. No CVSS score or confirmed active exploitation is provided in the source bundle.

Executive priority

Treat this as a scheduled but important kernel maintenance item, especially for Bluetooth-enabled endpoints, industrial systems, and embedded Linux assets. Escalate priority if a vendor advisory confirms affected deployed products or if Bluetooth is enabled on high-value systems.

Technical view

The flaw is in rfcomm_sock_setsockopt_old() within net/bluetooth/rfcomm/sock.c. copy_from_sockptr_offset/copy_from_sockptr could read past supplied data because the setsockopt input length was not validated. Linux stable commits are listed as fixes across multiple maintained kernel branches.

Likely exposure

Exposure is most relevant to Linux systems using affected kernel versions with Bluetooth RFCOMM support available. The bundle also includes Debian LTS and Siemens advisories, indicating downstream packaging or product impact may exist, but specific affected Siemens products are not listed here.

Exploitation context

The bundle does not show CISA KEV listing, public exploitation, or weaponized exploit evidence. The bug was reported by syzbot with KASAN as a slab out-of-bounds read. Practical impact beyond local kernel memory-safety risk is not established by the provided sources.

Researcher notes

Evidence supports a missing input-length validation bug in Linux Bluetooth RFCOMM setsockopt handling. The source bundle lacks CVSS, CWE, exploitability analysis, and detailed downstream product matrices. Avoid assuming remote reachability or privilege impact without vendor or kernel maintainer confirmation.

Mitigation direction

  • Update affected Linux kernels to vendor-fixed stable releases.
  • Apply Debian LTS kernel updates where Debian systems are in scope.
  • Review Siemens advisory guidance for any Siemens-managed environments.
  • Disable or restrict Bluetooth/RFCOMM where business operations do not require it.
  • Track vendor advisories if running embedded or appliance Linux distributions.

Validation and detection

  • Inventory Linux kernel versions across servers, endpoints, and appliances.
  • Check whether Bluetooth and RFCOMM support are enabled or loadable.
  • Confirm installed kernels include the referenced stable fix commits.
  • Review Debian and vendor advisories for distribution-specific fixed packages.
  • Document exceptions where kernel updates require maintenance windows.
Prepared
Confidence
medium
Sources
11

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-2024-35966 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
3ADP providers
10Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxbb23c0ab824653be4aa7dfca15b07b3059717004, bb23c0ab824653be4aa7dfca15b07b3059717004, bb23c0ab824653be4aa7dfca15b07b3059717004, bb23c0ab824653be4aa7dfca15b07b3059717004, bb23c0ab824653be4aa7dfca15b07b3059717004, bb23c0ab824653be4aa7dfca15b07b3059717004unaffected
LinuxLinux2.6.30, 0, 5.10.234, 5.15.178, 6.1.107, 6.6.47, 6.8.7, 6.9affected
Weakness

CWE details

No CWE listed

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