CVE-2025-68305 (GCVE-0-2025-68305)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-08-23 12:45
VLAI
Title
Bluetooth: hci_sock: Prevent race in socket write iter and sock bind
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sock: Prevent race in socket write iter and sock bind There is a potential race condition between sock bind and socket write iter. bind may free the same cmd via mgmt_pending before write iter sends the cmd, just as syzbot reported in UAF[1]. Here we use hci_dev_lock to synchronize the two, thereby avoiding the UAF mentioned in [1]. [1] syzbot reported: BUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316 Read of size 8 at addr ffff888077164818 by task syz.0.17/5989 Call Trace: mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316 set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 sock_write_iter+0x279/0x360 net/socket.c:1195 Allocated by task 5989: mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296 set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 sock_write_iter+0x279/0x360 net/socket.c:1195 Freed by task 5991: mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline] mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257 mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477 hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:21 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7b5958332f20dc66b19be564c402dbc21b927a81 , < 7344feaed3c8aa46d397984ae855e6026d3c3e95 (git)
Affected: bdd56875c6926d8009914f427df71797693e90d4 , < fe68510fc99bb4b88c9c611f83699749002d515a (git)
Affected: 4e83f2dbb2bf677e614109df24426c4dded472d4 , < e90c05fc5bbea956450a05cc3b36b8fa29cf195e (git)
Affected: 6fe26f694c824b8a4dbf50c635bee1302e3f099c , < 69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7 (git)
Affected: 6fe26f694c824b8a4dbf50c635bee1302e3f099c , < 89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392 (git)
Affected: d7882db79135c829a922daf3571f33ea1e056ae3 (git)
Affected: 6.6.94 , < 6.6.119 (semver)
Affected: 6.12.34 , < 6.12.61 (semver)
Affected: 6.15.3 , < 6.16 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "id": "CVE-2025-68305",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Prevent race in socket write iter and sock bind\n\nThere is a potential race condition between sock bind and socket write\niter. bind may free the same cmd via mgmt_pending before write iter sends\nthe cmd, just as syzbot reported in UAF[1].\n\nHere we use hci_dev_lock to synchronize the two, thereby avoiding the\nUAF mentioned in [1].\n\n[1]\nsyzbot reported:\nBUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nRead of size 8 at addr ffff888077164818 by task syz.0.17/5989\nCall Trace:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAllocated by task 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nFreed by task 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314"
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          "url": "https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a"
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    "datePublished": "2025-12-16T15:06:22.812Z",
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                  {
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Prevent race in socket write iter and sock bind\n\nThere is a potential race condition between sock bind and socket write\niter. bind may free the same cmd via mgmt_pending before write iter sends\nthe cmd, just as syzbot reported in UAF[1].\n\nHere we use hci_dev_lock to synchronize the two, thereby avoiding the\nUAF mentioned in [1].\n\n[1]\nsyzbot reported:\nBUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nRead of size 8 at addr ffff888077164818 by task syz.0.17/5989\nCall Trace:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAllocated by task 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nFreed by task 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nBluetooth: hci_sock: Prevenir condici\u00f3n de carrera en iteraci\u00f3n de escritura de socket y enlace de socket\n\nExiste una potencial condici\u00f3n de carrera entre el enlace de socket y la iteraci\u00f3n de escritura de socket. El enlace puede liberar el mismo comando a trav\u00e9s de mgmt_pending antes de que la iteraci\u00f3n de escritura env\u00ede el comando, tal como syzbot inform\u00f3 en UAF[1].\n\nAqu\u00ed usamos hci_dev_lock para sincronizar los dos, evitando as\u00ed el UAF mencionado en [1].\n\n[1]\nsyzbot inform\u00f3:\nBUG: KASAN: slab-uso-despu\u00e9s-de-liberaci\u00f3n en mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nLectura de tama\u00f1o 8 en la direcci\u00f3n ffff888077164818 por la tarea syz.0.17/5989\nRastro de Llamada:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAsignado por la tarea 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nLiberado por la tarea 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314"
          }
        ],
        "id": "CVE-2025-68305",
        "lastModified": "2026-10-14T16:10:00.250",
        "metrics": {
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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                "role": "CISA Coordinator",
                "timestamp": "2026-06-16T16:21:37.869509Z",
                "version": "2.0.3"
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        "published": "2025-12-16T16:16:10.030",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7344feaed3c8aa46d397984ae855e6026d3c3e95"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e90c05fc5bbea956450a05cc3b36b8fa29cf195e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T20:05:10+00:00",
      "cve": "CVE-2025-68305",
      "id": "CVE-2025-68305",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: hci_sock: Prevent race in socket write iter and sock bind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68305.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-68305",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-16T16:21:37.869509Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-16T16:21:44.841Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/bluetooth/hci_sock.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "7344feaed3c8aa46d397984ae855e6026d3c3e95",
                  "status": "affected",
                  "version": "7b5958332f20dc66b19be564c402dbc21b927a81",
                  "versionType": "git"
                },
                {
                  "lessThan": "fe68510fc99bb4b88c9c611f83699749002d515a",
                  "status": "affected",
                  "version": "bdd56875c6926d8009914f427df71797693e90d4",
                  "versionType": "git"
                },
                {
                  "lessThan": "e90c05fc5bbea956450a05cc3b36b8fa29cf195e",
                  "status": "affected",
                  "version": "4e83f2dbb2bf677e614109df24426c4dded472d4",
                  "versionType": "git"
                },
                {
                  "lessThan": "69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7",
                  "status": "affected",
                  "version": "6fe26f694c824b8a4dbf50c635bee1302e3f099c",
                  "versionType": "git"
                },
                {
                  "lessThan": "89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392",
                  "status": "affected",
                  "version": "6fe26f694c824b8a4dbf50c635bee1302e3f099c",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "d7882db79135c829a922daf3571f33ea1e056ae3",
                  "versionType": "git"
                },
                {
                  "lessThan": "6.6.119",
                  "status": "affected",
                  "version": "6.6.94",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.12.61",
                  "status": "affected",
                  "version": "6.12.34",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.16",
                  "status": "affected",
                  "version": "6.15.3",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/bluetooth/hci_sock.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "6.16"
                },
                {
                  "lessThan": "6.16",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.119",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.61",
                  "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": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.119",
                      "versionStartIncluding": "6.6.94",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.61",
                      "versionStartIncluding": "6.12.34",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17.11",
                      "versionStartIncluding": "6.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18",
                      "versionStartIncluding": "6.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "6.15.3",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sock: Prevent race in socket write iter and sock bind\n\nThere is a potential race condition between sock bind and socket write\niter. bind may free the same cmd via mgmt_pending before write iter sends\nthe cmd, just as syzbot reported in UAF[1].\n\nHere we use hci_dev_lock to synchronize the two, thereby avoiding the\nUAF mentioned in [1].\n\n[1]\nsyzbot reported:\nBUG: KASAN: slab-use-after-free in mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\nRead of size 8 at addr ffff888077164818 by task syz.0.17/5989\nCall Trace:\n mgmt_pending_remove+0x3b/0x210 net/bluetooth/mgmt_util.c:316\n set_link_security+0x5c2/0x710 net/bluetooth/mgmt.c:1918\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nAllocated by task 5989:\n mgmt_pending_add+0x35/0x140 net/bluetooth/mgmt_util.c:296\n set_link_security+0x557/0x710 net/bluetooth/mgmt.c:1910\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0x21c/0x270 net/socket.c:742\n sock_write_iter+0x279/0x360 net/socket.c:1195\n\nFreed by task 5991:\n mgmt_pending_free net/bluetooth/mgmt_util.c:311 [inline]\n mgmt_pending_foreach+0x30d/0x380 net/bluetooth/mgmt_util.c:257\n mgmt_index_removed+0x112/0x2f0 net/bluetooth/mgmt.c:9477\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-23T12:45:27.050Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/7344feaed3c8aa46d397984ae855e6026d3c3e95"
            },
            {
              "url": "https://git.kernel.org/stable/c/fe68510fc99bb4b88c9c611f83699749002d515a"
            },
            {
              "url": "https://git.kernel.org/stable/c/e90c05fc5bbea956450a05cc3b36b8fa29cf195e"
            },
            {
              "url": "https://git.kernel.org/stable/c/69fcb0344bc0dd5b13d7e4e98f8b6bf25a6d4ff7"
            },
            {
              "url": "https://git.kernel.org/stable/c/89bb613511cc21ed5ba6bddc1c9b9ae9c0dad392"
            }
          ],
          "title": "Bluetooth: hci_sock: Prevent race in socket write iter and sock bind",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-68305",
        "datePublished": "2025-12-16T15:06:22.812Z",
        "dateReserved": "2025-12-16T14:48:05.294Z",
        "dateUpdated": "2026-08-23T12:45:27.050Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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