CVE-2025-38303 (GCVE-0-2025-38303)

Vulnerability from cvelistv5 – Published: 2025-07-10 07:42 – Updated: 2026-10-21 12:37
VLAI
Title
Bluetooth: eir: Fix possible crashes on eir_create_adv_data
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: eir: Fix possible crashes on eir_create_adv_data eir_create_adv_data may attempt to add EIR_FLAGS and EIR_TX_POWER without checking if that would fit.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:49 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 , < 2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8 (git)
Affected: 01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 , < e98ce4b70beab73563d82bd21821024140e6da06 (git)
Affected: 01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 , < 2af40d795d3fb0ee5c074b7ac56ab22402aa6e4f (git)
Affected: 01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 , < b9db0c27e73b7c8a19384a44af527edfda74ff3d (git)
Affected: 01ce70b0a274bd76a5a311fb90d4d446d9bdfea1 , < 47c03902269aff377f959dc3fd94a9733aa31d6e (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.34 , ≤ 6.12.* (semver)
Unaffected: 6.15.3 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:49:29.846337Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:49:30.862Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/bluetooth/eir.c",
                "net/bluetooth/eir.h",
                "net/bluetooth/hci_sync.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8",
                  "status": "affected",
                  "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1",
                  "versionType": "git"
                },
                {
                  "lessThan": "e98ce4b70beab73563d82bd21821024140e6da06",
                  "status": "affected",
                  "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1",
                  "versionType": "git"
                },
                {
                  "lessThan": "2af40d795d3fb0ee5c074b7ac56ab22402aa6e4f",
                  "status": "affected",
                  "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1",
                  "versionType": "git"
                },
                {
                  "lessThan": "b9db0c27e73b7c8a19384a44af527edfda74ff3d",
                  "status": "affected",
                  "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1",
                  "versionType": "git"
                },
                {
                  "lessThan": "47c03902269aff377f959dc3fd94a9733aa31d6e",
                  "status": "affected",
                  "version": "01ce70b0a274bd76a5a311fb90d4d446d9bdfea1",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/bluetooth/eir.c",
                "net/bluetooth/eir.h",
                "net/bluetooth/hci_sync.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.16"
                },
                {
                  "lessThan": "5.16",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.168",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.160",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.34",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.15.*",
                  "status": "unaffected",
                  "version": "6.15.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.16",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.168",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.160",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.34",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.15.3",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: eir: Fix possible crashes on eir_create_adv_data\n\neir_create_adv_data may attempt to add EIR_FLAGS and EIR_TX_POWER\nwithout checking if that would fit."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The overflow is driven entirely by locally-configured advertising data submitted over an AF_BLUETOOTH HCI control socket (MGMT_OP_ADD_ADVERTISING / MGMT_OP_ADD_EXT_ADV_DATA), so local system access is mandatory. No adjacent or remote Bluetooth peer supplies any of the data consumed by eir_create_adv_data(), since advertising payloads are outbound and locally authored.\nAC:L - The attacker deterministically controls every input to the overflow \u2014 the adv instance flags (MGMT_ADV_FLAG_TX_POWER without a managed-flags bit), the exact adv_data_len at the tlv_data_max_len ceiling, and the BR/EDR-disabled state (MGMT_OP_SET_BREDR) that makes the kernel prepend the unbudgeted LE_AD_NO_BREDR Flags AD. There is no race, no timing window, and no memory-layout precondition outside the attacker\u0027s influence.\nPR:L - The handlers lack HCI_MGMT_UNTRUSTED so the socket must be CAP_NET_ADMIN-trusted, but in the realistic Bluetooth deployments for this code (Android\u0027s non-root AID_BLUETOOTH service, ChromeOS/embedded/automotive BT daemons) that capability is held by an unprivileged, remotely-exposed, SELinux-confined daemon rather than by root. A compromised Bluetooth daemon \u2014 far short of full admin \u2014 is sufficient to reach the bug.\nUI:N - The attacker issues every mgmt command needed (set bredr off, add advertising with a max-length payload) from its own socket, and the overflow fires from the hci_cmd_sync_work kthread without any victim action. No pairing, connection, or user-initiated operation by another party is involved.\nS:U - The corruption occurs on the kernel stack of the Bluetooth command-sync worker, within the same kernel security authority as the vulnerable code. No VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - In the extended-advertising path the inflated return value propagates into struct_size(pdu, data, len), so the HCI command skb is assembled from bytes beyond the 255-byte stack object, leaking adjacent kernel stack contents into the HCI command stream and to HCI monitor consumers; the legacy path similarly publishes hdev-\u003eadv_data_len = 34 with only 31 valid bytes. Combined with the stack-corruption primitive, this is leverageable for kernel memory disclosure.\nI:H - This is an out-of-bounds write past a fixed-size stack buffer, placing attacker-influenced bytes (0x02, EIR_TX_POWER, and a tx_power value the attacker can steer via the advertising parameters) into adjacent stack storage of the hci_cmd_sync_work frame. Per the OOB-write classification this is a control-flow-relevant corruption primitive, not a mere bad read.\nA:H - The commit is titled \"Fix possible crashes\" and the confirmed KASAN report on this code shows stack-out-of-bounds writes in eir_create_adv_data() from hci_cmd_sync_work. On stack-protector kernels overwriting past the buffer trips __stack_chk_fail and panics the machine; otherwise it oopses or corrupts the worker\u0027s frame, taking down the Bluetooth subsystem or the system."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-21T12:37:00.173Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2d4588f55cc10fc228f3b46469dbfb3f0a8b13c8"
            },
            {
              "url": "https://git.kernel.org/stable/c/e98ce4b70beab73563d82bd21821024140e6da06"
            },
            {
              "url": "https://git.kernel.org/stable/c/2af40d795d3fb0ee5c074b7ac56ab22402aa6e4f"
            },
            {
              "url": "https://git.kernel.org/stable/c/b9db0c27e73b7c8a19384a44af527edfda74ff3d"
            },
            {
              "url": "https://git.kernel.org/stable/c/47c03902269aff377f959dc3fd94a9733aa31d6e"
            }
          ],
          "title": "Bluetooth: eir: Fix possible crashes on eir_create_adv_data",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-38303",
        "datePublished": "2025-07-10T07:42:14.728Z",
        "dateReserved": "2025-04-16T04:51:24.002Z",
        "dateUpdated": "2026-10-21T12:37:00.173Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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