FKIE_CVE-2026-53358

Vulnerability from fkie_nvd - Published: 2026-07-02 15:17 - Updated: 2026-07-02 15:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen() l2cap_chan_close() removes the channel from conn->chan_l, which must be done under conn->lock. cleanup_listen() runs under the parent sk_lock, so acquiring conn->lock would invert the established conn->lock -> chan->lock -> sk_lock order. Instead of calling l2cap_chan_close() directly, schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously. The timeout handler already acquires conn->lock and chan->lock in the correct order. The timer is only armed when chan->conn is still set: if it is already NULL, l2cap_conn_del() has already processed this channel (l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb), so there is nothing left to do. If l2cap_conn_del() races in after the timer is armed, __clear_chan_timer() inside l2cap_chan_del() cancels it; if the timer has already fired, the handler returns harmlessly because chan->conn was cleared.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3634cbdc2eb414b69ffa752ddbe5e0458518e321",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "e1c100e2d61bd8c718b7d91fe3e050780a9bf72d",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "89dec92041717b027216e110599e4f6d6c921b79",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "50dfec218808b148ab4247b1858031b7a32015c5",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "859d3ace791ed878ae9ba5522c7844d960da8f88",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "7555fd885a0603f50e49a655850a1f2bd8a25398",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            },
            {
              "lessThan": "8c8e620467a7b51562dbcefbd1f09f288d7d710d",
              "status": "affected",
              "version": "3df91ea20e744344100b10ae69a17211fcf5b207",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.4"
            },
            {
              "lessThan": "3.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: use chan timer to close channels in cleanup_listen()\n\nl2cap_chan_close() removes the channel from conn-\u003echan_l, which\nmust be done under conn-\u003elock.  cleanup_listen() runs under the\nparent sk_lock, so acquiring conn-\u003elock would invert the\nestablished conn-\u003elock -\u003e chan-\u003elock -\u003e sk_lock order.\n\nInstead of calling l2cap_chan_close() directly, schedule\nl2cap_chan_timeout with delay 0 to close the channel\nasynchronously.  The timeout handler already acquires conn-\u003elock\nand chan-\u003elock in the correct order.\n\nThe timer is only armed when chan-\u003econn is still set: if it is\nalready NULL, l2cap_conn_del() has already processed this channel\n(l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb),\nso there is nothing left to do.  If l2cap_conn_del() races in\nafter the timer is armed, __clear_chan_timer() inside\nl2cap_chan_del() cancels it; if the timer has already fired, the\nhandler returns harmlessly because chan-\u003econn was cleared."
    }
  ],
  "id": "CVE-2026-53358",
  "lastModified": "2026-07-02T15:17:03.283",
  "metrics": {},
  "published": "2026-07-02T15:17:03.283",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/50dfec218808b148ab4247b1858031b7a32015c5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7555fd885a0603f50e49a655850a1f2bd8a25398"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/859d3ace791ed878ae9ba5522c7844d960da8f88"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/89dec92041717b027216e110599e4f6d6c921b79"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8c8e620467a7b51562dbcefbd1f09f288d7d710d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e1c100e2d61bd8c718b7d91fe3e050780a9bf72d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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