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CVE-2026-80914 (GCVE-0-2026-80914)

Vulnerability from cvelistv5 – Published: 2026-09-09 16:10 – Updated: 2026-09-10 05:50
VLAI
Title
Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready iso_conn_ready() looks up the BIS listener socket with iso_get_sock(), which takes a reference, and then, without re-checking its state, creates a child socket from it: parent = iso_get_sock(hdev, ...); if (!parent) return; lock_sock(parent); sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...); ... iso_chan_add(conn, sk, parent); ... release_sock(parent); sock_put(parent); If the listener socket is closed concurrently, between iso_get_sock() and lock_sock(), the reference taken by iso_get_sock() may be the last one: the close path drops the link-list reference, and once iso_conn_ready() drops its own reference at the end of the function the socket is freed. The child socket, however, is already linked to the freed parent, and a later disconnect of the child runs iso_chan_del() -> bt_accept_unlink(), which dereferences the dangling parent pointer into the freed accept queue (a use-after-free). The same dangling pointer is also dereferenced through parent->***() in iso_chan_del(). Fix it the same way the connected (non-BIS) path was fixed in commit 0d255e63fcf3 ("Bluetooth: ISO: hold sk properly in iso_conn_ready"): after taking the socket lock, re-check that the parent is still a listening, alive socket, and bail out otherwise.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 2387cd06a2c0b416f05028b02bba1089f54c28d9 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 49fd7116f76b860b230843700fb7423ab5331e1f (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 03288b7447c9e572f8ab82fc29cfb4ca719ab210 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 560bef609fa5992745929e8d7d458b9d88dd2830 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "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": [
            {
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              "status": "affected",
              "version": "ccf74f2390d60a2f9a75ef496d2564abb478f46a",
              "versionType": "git"
            },
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              "versionType": "git"
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              "versionType": "git"
            }
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        },
        {
          "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": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\n\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\nwhich takes a reference, and then, without re-checking its state,\ncreates a child socket from it:\n\n    parent = iso_get_sock(hdev, ...);\n    if (!parent)\n        return;\n\n    lock_sock(parent);\n    sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\n    ...\n    iso_chan_add(conn, sk, parent);\n    ...\n    release_sock(parent);\n    sock_put(parent);\n\nIf the listener socket is closed concurrently, between iso_get_sock()\nand lock_sock(), the reference taken by iso_get_sock() may be the last\none: the close path drops the link-list reference, and once\niso_conn_ready() drops its own reference at the end of the function the\nsocket is freed.  The child socket, however, is already linked to the\nfreed parent, and a later disconnect of the child runs iso_chan_del()\n-\u003e bt_accept_unlink(), which dereferences the dangling parent pointer\ninto the freed accept queue (a use-after-free).  The same dangling\npointer is also dereferenced through parent-\u003e***() in\niso_chan_del().\n\nFix it the same way the connected (non-BIS) path was fixed in commit\n0d255e63fcf3 (\"Bluetooth: ISO: hold sk properly in iso_conn_ready\"):\nafter taking the socket lock, re-check that the parent is still a\nlistening, alive socket, and bail out otherwise."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The UAF is in Bluetooth ISO iso_conn_ready() parent-lookup for incoming CIS/BIS/PA; that path runs from HCI connect_cfm events (hci_le_cis_req_evt, BIG/PA sync) driven by LE isochronous traffic from peers in radio range, which is an adjacent attack surface.\nAC:L - This is a use-after-free race between iso_get_sock() and listener close (iso_sock_release/iso_sock_kill) before lock_sock(); an attacker who opens/closes an ISO listen socket while concurrent HCI CIS/BIS/PA completion runs controls both sides and can trigger it without uncontrollable conditions.\nPR:N - iso_sock_create has no capability check, and the vulnerable path is reached from unauthenticated HCI CIS/BIG/PA events processed for any Bluetooth-enabled device in range; listener close can occur from automatic LE Audio/bluetoothd teardown without privileged local credentials.\nUI:N - No victim action is required: iso_connect_ind returns HCI_LM_ACCEPT so incoming CIS/BIS/PA sync is auto-accepted when an ISO listener exists, and OS LE Audio stacks keep such listeners during normal broadcast/unicast operation.\nS:U - The UAF corrupts kernel socket/accept-queue memory and can enable privilege escalation within the host kernel; it does not cross a VM, container, or IOMMU security boundary, so scope remains unchanged.\nC:H - Use-after-free of the listener struct sock (and later bt_accept_unlink of the dangling parent) lets an attacker reuse the freed sock/accept-queue object, enabling arbitrary kernel memory disclosure via heap grooming per UAF guidance.\nI:H - The child is linked to the freed parent via iso_chan_add/bt_accept_enqueue; later iso_chan_del -\u003e bt_accept_unlink writes the freed parent\u0027s accept queue (list_del, sk_acceptq_removed), a kernel heap write primitive usable for control-flow hijack.\nA:H - Dereferencing the freed listener in iso_chan_del/bt_accept_unlink (accept_q_lock, list, parent-\u003esk_data_ready) causes kernel oops/panic; UAFs in this ISO path are a high availability impact even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-10T05:50:21.452Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f"
        },
        {
          "url": "https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210"
        },
        {
          "url": "https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830"
        }
      ],
      "title": "Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80914",
    "datePublished": "2026-09-09T16:10:58.675Z",
    "dateReserved": "2026-08-26T14:34:25.801Z",
    "dateUpdated": "2026-09-10T05:50:21.452Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80914",
      "date": "2026-09-11",
      "epss": "0.00219",
      "percentile": "0.12286"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:02:46.000Z",
      "cve": "CVE-2026-80914",
      "id": "msrc_CVE-2026-80914",
      "initial_release_date": "2026-09-11T01:02:46.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80914.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80914\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-09T17:17:46.263\",\"lastModified\":\"2026-09-10T06:17:05.900\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: ISO: fix use-after-free of listener socket in iso_conn_ready\\n\\niso_conn_ready() looks up the BIS listener socket with iso_get_sock(),\\nwhich takes a reference, and then, without re-checking its state,\\ncreates a child socket from it:\\n\\n    parent = iso_get_sock(hdev, ...);\\n    if (!parent)\\n        return;\\n\\n    lock_sock(parent);\\n    sk = iso_sock_alloc(sock_net(parent), NULL, BTPROTO_ISO, ...);\\n    ...\\n    iso_chan_add(conn, sk, parent);\\n    ...\\n    release_sock(parent);\\n    sock_put(parent);\\n\\nIf the listener socket is closed concurrently, between iso_get_sock()\\nand lock_sock(), the reference taken by iso_get_sock() may be the last\\none: the close path drops the link-list reference, and once\\niso_conn_ready() drops its own reference at the end of the function the\\nsocket is freed.  The child socket, however, is already linked to the\\nfreed parent, and a later disconnect of the child runs iso_chan_del()\\n-\u003e bt_accept_unlink(), which dereferences the dangling parent pointer\\ninto the freed accept queue (a use-after-free).  The same dangling\\npointer is also dereferenced through parent-\u003e***() in\\niso_chan_del().\\n\\nFix it the same way the connected (non-BIS) path was fixed in commit\\n0d255e63fcf3 (\\\"Bluetooth: ISO: hold sk properly in iso_conn_ready\\\"):\\nafter taking the socket lock, re-check that the parent is still a\\nlistening, alive socket, and bail out otherwise.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"2387cd06a2c0b416f05028b02bba1089f54c28d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"49fd7116f76b860b230843700fb7423ab5331e1f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"03288b7447c9e572f8ab82fc29cfb4ca719ab210\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ccf74f2390d60a2f9a75ef496d2564abb478f46a\",\"lessThan\":\"560bef609fa5992745929e8d7d458b9d88dd2830\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03288b7447c9e572f8ab82fc29cfb4ca719ab210\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2387cd06a2c0b416f05028b02bba1089f54c28d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49fd7116f76b860b230843700fb7423ab5331e1f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/560bef609fa5992745929e8d7d458b9d88dd2830\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.

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  • 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.
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