CVE-2025-68304 (GCVE-0-2025-68304)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2025-12-16 15:06
VLAI?
Title
Bluetooth: hci_core: lookup hci_conn on RX path on protocol side
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: lookup hci_conn on RX path on protocol side The hdev lock/lookup/unlock/use pattern in the packet RX path doesn't ensure hci_conn* is not concurrently modified/deleted. This locking appears to be leftover from before conn_hash started using RCU commit bf4c63252490b ("Bluetooth: convert conn hash to RCU") and not clear if it had purpose since then. Currently, there are code paths that delete hci_conn* from elsewhere than the ordered hdev->workqueue where the RX work runs in. E.g. commit 5af1f84ed13a ("Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync") introduced some of these, and there probably were a few others before it. It's better to do the locking so that even if these run concurrently no UAF is possible. Move the lookup of hci_conn and associated socket-specific conn to protocol recv handlers, and do them within a single critical section to cover hci_conn* usage and lookup. syzkaller has reported a crash that appears to be this issue: [Task hdev->workqueue] [Task 2] hci_disconnect_all_sync l2cap_recv_acldata(hcon) hci_conn_get(hcon) hci_abort_conn_sync(hcon) hci_dev_lock hci_dev_lock hci_conn_del(hcon) v-------------------------------- hci_dev_unlock hci_conn_put(hcon) conn = hcon->l2cap_data (UAF)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5af1f84ed13a416297ab9ced7537f4d5ae7f329a , < ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93 (git)
Affected: 5af1f84ed13a416297ab9ced7537f4d5ae7f329a , < 79a2d4678ba90bdba577dc3af88cc900d6dcd5ee (git)
Affected: cd55c13bbb3d093ae601aa97e588ed4c1390ebb1 (git)
Affected: 4d3ca4a9aaf0aa798a6be372dc0fc3a29e37dd57 (git)
Affected: 80265dd1d944c3f33e52375b5dbe654980bd2688 (git)
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    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_core.c",
            "net/bluetooth/iso.c",
            "net/bluetooth/l2cap_core.c",
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "product": "Linux",
          "programFiles": [
            "include/net/bluetooth/hci_core.h",
            "net/bluetooth/hci_core.c",
            "net/bluetooth/iso.c",
            "net/bluetooth/l2cap_core.c",
            "net/bluetooth/sco.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.17.11",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.149",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: lookup hci_conn on RX path on protocol side\n\nThe hdev lock/lookup/unlock/use pattern in the packet RX path doesn\u0027t\nensure hci_conn* is not concurrently modified/deleted. This locking\nappears to be leftover from before conn_hash started using RCU\ncommit bf4c63252490b (\"Bluetooth: convert conn hash to RCU\")\nand not clear if it had purpose since then.\n\nCurrently, there are code paths that delete hci_conn* from elsewhere\nthan the ordered hdev-\u003eworkqueue where the RX work runs in. E.g.\ncommit 5af1f84ed13a (\"Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync\")\nintroduced some of these, and there probably were a few others before\nit.  It\u0027s better to do the locking so that even if these run\nconcurrently no UAF is possible.\n\nMove the lookup of hci_conn and associated socket-specific conn to\nprotocol recv handlers, and do them within a single critical section\nto cover hci_conn* usage and lookup.\n\nsyzkaller has reported a crash that appears to be this issue:\n\n    [Task hdev-\u003eworkqueue]          [Task 2]\n                                    hci_disconnect_all_sync\n    l2cap_recv_acldata(hcon)\n                                      hci_conn_get(hcon)\n                                      hci_abort_conn_sync(hcon)\n                                        hci_dev_lock\n      hci_dev_lock\n                                        hci_conn_del(hcon)\n      v-------------------------------- hci_dev_unlock\n                                      hci_conn_put(hcon)\n      conn = hcon-\u003el2cap_data (UAF)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:21.887Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93"
        },
        {
          "url": "https://git.kernel.org/stable/c/79a2d4678ba90bdba577dc3af88cc900d6dcd5ee"
        }
      ],
      "title": "Bluetooth: hci_core: lookup hci_conn on RX path on protocol side",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68304",
    "datePublished": "2025-12-16T15:06:21.887Z",
    "dateReserved": "2025-12-16T14:48:05.294Z",
    "dateUpdated": "2025-12-16T15:06:21.887Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68304\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T16:16:09.930\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: hci_core: lookup hci_conn on RX path on protocol side\\n\\nThe hdev lock/lookup/unlock/use pattern in the packet RX path doesn\u0027t\\nensure hci_conn* is not concurrently modified/deleted. This locking\\nappears to be leftover from before conn_hash started using RCU\\ncommit bf4c63252490b (\\\"Bluetooth: convert conn hash to RCU\\\")\\nand not clear if it had purpose since then.\\n\\nCurrently, there are code paths that delete hci_conn* from elsewhere\\nthan the ordered hdev-\u003eworkqueue where the RX work runs in. E.g.\\ncommit 5af1f84ed13a (\\\"Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync\\\")\\nintroduced some of these, and there probably were a few others before\\nit.  It\u0027s better to do the locking so that even if these run\\nconcurrently no UAF is possible.\\n\\nMove the lookup of hci_conn and associated socket-specific conn to\\nprotocol recv handlers, and do them within a single critical section\\nto cover hci_conn* usage and lookup.\\n\\nsyzkaller has reported a crash that appears to be this issue:\\n\\n    [Task hdev-\u003eworkqueue]          [Task 2]\\n                                    hci_disconnect_all_sync\\n    l2cap_recv_acldata(hcon)\\n                                      hci_conn_get(hcon)\\n                                      hci_abort_conn_sync(hcon)\\n                                        hci_dev_lock\\n      hci_dev_lock\\n                                        hci_conn_del(hcon)\\n      v-------------------------------- hci_dev_unlock\\n                                      hci_conn_put(hcon)\\n      conn = hcon-\u003el2cap_data (UAF)\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/79a2d4678ba90bdba577dc3af88cc900d6dcd5ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ec74cdf77310c43b01b83ee898a9bd4b4b0b8e93\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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