CVE-2026-53358 (GCVE-0-2026-53358)

Vulnerability from cvelistv5 – Published: 2026-07-02 13:43 – Updated: 2026-07-02 13:43
VLAI
Title
Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 3634cbdc2eb414b69ffa752ddbe5e0458518e321 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < e1c100e2d61bd8c718b7d91fe3e050780a9bf72d (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 89dec92041717b027216e110599e4f6d6c921b79 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 50dfec218808b148ab4247b1858031b7a32015c5 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 859d3ace791ed878ae9ba5522c7844d960da8f88 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 7555fd885a0603f50e49a655850a1f2bd8a25398 (git)
Affected: 3df91ea20e744344100b10ae69a17211fcf5b207 , < 8c8e620467a7b51562dbcefbd1f09f288d7d710d (git)
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Linux Linux Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-02T13:43:17.630Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/3634cbdc2eb414b69ffa752ddbe5e0458518e321"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53358",
    "datePublished": "2026-07-02T13:43:17.630Z",
    "dateReserved": "2026-06-09T07:44:35.400Z",
    "dateUpdated": "2026-07-02T13:43:17.630Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/l2cap_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"3634cbdc2eb414b69ffa752ddbe5e0458518e321\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"e1c100e2d61bd8c718b7d91fe3e050780a9bf72d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"89dec92041717b027216e110599e4f6d6c921b79\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"50dfec218808b148ab4247b1858031b7a32015c5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"859d3ace791ed878ae9ba5522c7844d960da8f88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"7555fd885a0603f50e49a655850a1f2bd8a25398\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3df91ea20e744344100b10ae69a17211fcf5b207\",\"lessThan\":\"8c8e620467a7b51562dbcefbd1f09f288d7d710d\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/l2cap_sock.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"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.

Sightings

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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.