{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d324b8aa20bd3c3394e3647dc22491d88f3f4e7a",
              "status": "affected",
              "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796",
              "versionType": "git"
            },
            {
              "lessThan": "f50331f2a1441ec49988832c3a95f2edacc47322",
              "status": "affected",
              "version": "d3413703d5f8b7d1e6f514f9440ed5da1bc30796",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix a use-after-free of the hci_conn pointer\n\nIn iso_sock_rebind_bc(), the bis pointer is cached, then the socket lock is\ndropped:\n\tbis = iso_pi(sk)-\u003econn-\u003ehcon;\n\t/* Release the socket before lookups since that requires hci_dev_lock\n\t * which shall not be acquired while holding sock_lock for proper\n\t * ordering.\n\t */\n\trelease_sock(sk);\n\thci_dev_lock(bis-\u003ehdev);\n\nDuring the unlocked window, could a concurrent close() destroy the connection\nand free the bis structure, causing hci_dev_lock(bis-\u003ehdev) to access memory\nafter it is freed, fix this by using the hdev reference which was safely\nacquired via iso_conn_get_hdev()."
        }
      ],
      "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 vulnerable path is reached through local AF_BLUETOOTH ISO socket operations, specifically bind() rebinding on an already connected or CONNECT2 ISO socket. An adjacent Bluetooth peer may be involved in establishing BIS/PAST state, but the actual trigger is a local syscall/race, not an unauthenticated received packet alone.\nAC:L - The bug is a use-after-free race where the rebind path drops the socket lock and a concurrent close can free the cached hci_conn pointer. A local attacker can control both sides by using concurrent operations on their own socket, so no uncontrollable condition is required.\nPR:L - The ISO socket create/bind/connect/rebind path has no CAP_NET_ADMIN or CAP_NET_RAW check, but it requires the attacker to run local code and create/use a Bluetooth ISO socket. This is therefore basic unprivileged local access rather than real administrative privilege.\nUI:N - No victim user action is required once the attacker can run local code; the attacker can create the socket state and trigger the concurrent bind/close race themselves.\nS:U - The vulnerable code is in the kernel Bluetooth stack and impacts the same kernel security authority. There is no VM escape, IOMMU bypass, or other cross-scope boundary indicated.\nC:H - This is a use-after-free of an hci_conn pointer, and under the required higher-severity rule UAFs are treated as capable of enabling memory disclosure through heap reuse and object manipulation.\nI:H - A kernel use-after-free can potentially be shaped into control-flow or data-structure corruption via heap spraying/reuse. Under the required higher-severity rule, this supports high integrity impact.\nA:H - The stale hci_conn dereference can access freed memory while taking hci_dev_lock(bis-\u003ehdev), which can oops or panic the kernel. A repeatable local trigger gives high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:34:52.648Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d324b8aa20bd3c3394e3647dc22491d88f3f4e7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f50331f2a1441ec49988832c3a95f2edacc47322"
        }
      ],
      "title": "Bluetooth: ISO: Fix a use-after-free of the hci_conn pointer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53276",
    "datePublished": "2026-06-25T08:39:59.804Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-08-05T12:34:52.648Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}