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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
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.
Show details on NVD website
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        "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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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


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.