CVE-2024-35963 (GCVE-0-2024-35963)

Vulnerability from cvelistv5 – Published: 2024-05-20 09:41 – Updated: 2026-08-05 11:31
VLAI
Title
Bluetooth: hci_sock: Fix not validating setsockopt user input
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sock: Fix not validating setsockopt user input Check user input length before copying data.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:40 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 09572fca7223bcf32c9f0d5e100d8381a81d55f4 , < 781f3a97a38a338bc893b6db7f9f9670bf1a9e37 (git)
Affected: 09572fca7223bcf32c9f0d5e100d8381a81d55f4 , < 0c18a64039aa3f1c16f208d197c65076da798137 (git)
Affected: 09572fca7223bcf32c9f0d5e100d8381a81d55f4 , < 50173882bb187e70e37bac01385b9b114019bee2 (git)
Affected: 09572fca7223bcf32c9f0d5e100d8381a81d55f4 , < b2186061d6043d6345a97100460363e990af0d46 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.55 , ≤ 6.6.* (semver)
Unaffected: 6.8.7 , ≤ 6.8.* (semver)
Unaffected: 6.9 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                "value": "CWE-1284"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:58:19+00:00",
      "cve": "CVE-2024-35963",
      "id": "CVE-2024-35963",
      "initial_release_date": "2024-05-20T00:00:00+00:00",
      "product_status:fixed": "305",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sock: Fix not validating setsockopt user input",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35963.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-19T02:32:36Z",
      "cve": "CVE-2024-35963",
      "id": "CVE-2024-35963",
      "initial_release_date": "2024-05-21T01:58:46Z",
      "product_status:known_affected": "315",
      "product_status:known_not_affected": "270",
      "product_status:recommended": "713",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-35963",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-35963.json",
      "version": "96"
    },
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                "url": "https://git.kernel.org/stable/c/b2186061d6043d6345a97100460363e990af0d46"
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-35963",
                    "options": [
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
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                  "version": "6.6.55",
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                  "version": "6.8.7",
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                  "status": "unaffected",
                  "version": "6.9",
                  "versionType": "original_commit_for_fix"
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                  "lang": "en",
                  "value": "AV:L - The flaw is reached purely through setsockopt(2)/getsockopt(2) on a locally created AF_BLUETOOTH/BTPROTO_HCI socket; no Bluetooth radio traffic, paired peer, or HCI adapter link participates in reaching the unvalidated copy.\nAC:L - Triggering is fully deterministic \u2014 issue setsockopt(fd, SOL_HCI, HCI_DATA_DIR, buf, optlen\u003c4) or setsockopt(fd, SOL_BLUETOOTH, BT_SNDMTU, buf, optlen\u003c2); there is no race, no timing window, and the attacker can groom the kmalloc-8/16 slab to choose what sits past the allocation.\nPR:L - bt_sock_create() and hci_sock_create() contain no capability check and the socket defaults to HCI_CHANNEL_RAW, so any unprivileged local user reaches hci_sock_setsockopt_old() with no bind and no caps; CAP_NET_RAW only narrows the filter masks, and HCI_CHANNEL_CONTROL binding for the BT_SNDMTU path is explicitly allowed for untrusted users.\nUI:N - The attacker performs every step on its own socket \u2014 create, bind, setsockopt, getsockopt; no victim action, mount, or file open is required.\nS:U - The out-of-bounds access stays within kernel slab memory under the same security authority, crossing no VM, IOMMU, or sandbox boundary.\nC:H - This is an out-of-bounds read of kernel heap memory past the end of the exact-size kernel_optval allocation, and the disclosed bytes flow straight back to userspace \u2014 hci_sock_getsockopt() put_user()s hci_pi(sk)-\u003emtu verbatim, yielding a repeatable 16-bit kernel-heap oracle (plus a bit-oracle via HCI_DATA_DIR/HCI_TIME_STAMP) usable with heap grooming to leak kernel data and defeat KASLR.\nI:N - Nothing is written out of bounds; the only state changed is the attacker\u0027s own socket cmsg_mask, filter, and mtu, all of which are settable through the normal API anyway, so no data outside the attacker\u0027s authority is modified.\nA:H - The slab out-of-bounds read raises a KASAN BUG that panics outright under the widely deployed panic_on_warn configuration, and the read can fault when it crosses into a KFENCE guard page or unmapped page, producing a kernel oops that an unprivileged local user can repeat at will."
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              "url": "https://git.kernel.org/stable/c/b2186061d6043d6345a97100460363e990af0d46"
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            "engine": "bippy-1.2.0"
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-35963",
        "datePublished": "2024-05-20T09:41:53.861Z",
        "dateReserved": "2024-05-17T13:50:33.137Z",
        "dateUpdated": "2026-08-05T11:31:15.289Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.