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CVE-2026-72333

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: fix tx ident leak for commands without a response

Commit 6c3ea155e5ee ("Bluetooth: L2CAP: Fix not tracking outstanding TX ident") changed ident allocation to use an IDA, releasing idents in l2cap_put_ident() when the matching response command is received.

But identifiers allocated for commands that have no response defined are never released. In particular L2CAP_LE_CREDITS is sent repeatedly for the lifetime of an LE CoC channel, so a peer streaming data to the host exhausts the 1-255 ident range after 254 credit packets. From then on l2cap_get_ident() fails:

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and every subsequent L2CAP_LE_CREDITS packet is sent with ident 0, which is invalid (Core Spec, Vol 3, Part A, Section 4: "Signaling identifier 0x00 is an invalid identifier and shall never be used in any command"). Remote stacks that validate the ident drop these commands, never receive new credits, and the channel stalls permanently. With default socket buffers this happens after roughly 0.5 MB of received data (the exact amount depends on the socket receive buffer):

Release the ident immediately after sending L2CAP_LE_CREDITS since no response will ever release it. Use a local variable instead of chan->ident so that an ident that an EXT_FLOWCTL channel may be waiting on (e.g. a pending reconfigure) is not overwritten by a credit packet.

Also add the missing L2CAP_LE_CONN_RSP case to l2cap_put_ident() so idents allocated for outgoing L2CAP_LE_CONN_REQ commands are released when the response arrives.

Detalles técnicos trazas, registros y código del informe original
    kernel: Bluetooth: Unable to allocate ident: -28

  < ACL Data TX: Handle 2048 flags 0x00 dlen 12
        LE L2CAP: LE Flow Control Credit (0x16) ident 0 len 4
          Source CID: 64
          Credits: 1

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-72333",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e86554c37d3d2b4b24608e0313f882cae28b8adb",
              "lessThan": "b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9b24ad4787cad46a3917620799f8455c6533b8df",
              "lessThan": "bd1e01170341291292fd4c46b5f6949da282ca6c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ea6cf86167b3972caa68972d2a1ad43ecbbb8331",
              "lessThan": "0c602cb8f148a36bfb39c25ade400bdadc023c4f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6c3ea155e5ee3e56606233acde8309afda66d483",
              "lessThan": "d0a2b0c81f112540a337cde1c20251bf05ddf1da",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "versionType": "git"
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            {
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              "version": "ed97bb2cf96684ee646be6f37e4c4835f9d30caa",
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            {
              "status": "affected",
              "version": "84bc3197f7d87c5b89c156e853d0561a9154eceb",
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            {
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              "version": "8c1cdbc1bacc0cf9c27c3ebda11a81c3dcd01630",
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            },
            {
              "status": "affected",
              "version": "6.18.21",
              "lessThan": "6.18.40",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.10.261",
              "lessThan": "5.11",
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            {
              "status": "affected",
              "version": "5.15.212",
              "lessThan": "5.16",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.19.11",
              "lessThan": "6.20",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "7.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-15T06:22:06.433",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0c602cb8f148a36bfb39c25ade400bdadc023c4f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6e1930ece855a4c256f1c7e6632d634cfb9888b5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bd1e01170341291292fd4c46b5f6949da282ca6c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d0a2b0c81f112540a337cde1c20251bf05ddf1da",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: fix tx ident leak for commands without a response\n\nCommit 6c3ea155e5ee (\"Bluetooth: L2CAP: Fix not tracking outstanding\nTX ident\") changed ident allocation to use an IDA, releasing idents in\nl2cap_put_ident() when the matching response command is received.\n\nBut identifiers allocated for commands that have no response defined\nare never released. In particular L2CAP_LE_CREDITS is sent repeatedly for\nthe lifetime of an LE CoC channel, so a peer streaming data to the\nhost exhausts the 1-255 ident range after 254 credit packets. From\nthen on l2cap_get_ident() fails:\n\n    kernel: Bluetooth: Unable to allocate ident: -28\n\nand every subsequent L2CAP_LE_CREDITS packet is sent with ident 0,\nwhich is invalid (Core Spec, Vol 3, Part A, Section 4: \"Signaling\nidentifier 0x00 is an invalid identifier and shall never be used in\nany command\"). Remote stacks that validate the ident drop these\ncommands, never receive new credits, and the channel stalls\npermanently. With default socket buffers this happens after roughly 0.5 MB\nof received data (the exact amount depends on the socket receive buffer):\n\n  < ACL Data TX: Handle 2048 flags 0x00 dlen 12\n        LE L2CAP: LE Flow Control Credit (0x16) ident 0 len 4\n          Source CID: 64\n          Credits: 1\n\nRelease the ident immediately after sending L2CAP_LE_CREDITS since no\nresponse will ever release it. Use a local variable instead of\nchan->ident so that an ident that an EXT_FLOWCTL channel may be waiting on\n(e.g. a pending reconfigure) is not overwritten by a credit packet.\n\nAlso add the missing L2CAP_LE_CONN_RSP case to l2cap_put_ident() so\nidents allocated for outgoing L2CAP_LE_CONN_REQ commands are released\nwhen the response arrives."
    }
  ],
  "lastModified": "2026-08-17T06:18:36.910",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}