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

Vulnerability from cvelistv5 – Published: 2026-07-02 13:43 – Updated: 2026-08-05 12:35
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
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: 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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              "value": "AV:A - The vulnerable L2CAP child channels are created and torn down through Bluetooth BR/EDR or LE signaling from a nearby peer, so the remote reachability is adjacent. Bluetooth is not generally Internet-routable, but phones, embedded devices, and kiosks commonly expose this surface to nearby attackers.\nAC:L - The bug is a race, but the attacker can repeatedly create queued L2CAP children and trigger disconnect/cleanup timing; related reports show the listen/close versus HCI-disconnect race reproducing reliably. Under the required rule, the attacker-controlled repeatable race is scored Low complexity.\nPR:N - A nearby Bluetooth peer can reach L2CAP connection setup before application authentication, including low-security/SDP-style services, without an OS account on the target. If a local service lifecycle participates in cleanup, that is target state rather than attacker privilege.\nUI:N - No victim user action such as opening a file or accepting a prompt is required once Bluetooth and a listening L2CAP service are present. The attacker can drive the Bluetooth connection and disconnect attempts directly.\nS:U - The corruption occurs inside the Linux kernel Bluetooth stack and impacts the same kernel security authority. There is no VM escape, IOMMU bypass, or cross-authority boundary change indicated.\nC:H - The old path called l2cap_chan_close() without conn-\u003elock, allowing unlocked removal from conn-\u003echan_l and races with l2cap_conn_del() over sock/l2cap_chan lifetime. This is kernel memory corruption/UAF-adjacent behavior, which is defensibly exploitable for high confidentiality impact.\nI:H - The race can corrupt kernel list/refcount state around l2cap_chan and sock teardown, giving a plausible route to use-after-free style heap manipulation. Kernel memory corruption is scored as high integrity impact under the provided guidance.\nA:H - At minimum, racing channel cleanup and connection deletion can cause list corruption, double teardown, UAF, KASAN splats, oops, or panic. A repeatable kernel crash is high availability impact."
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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-18T08:05:36+00:00",
      "cve": "CVE-2026-53358",
      "id": "CVE-2026-53358",
      "initial_release_date": "2026-07-02T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53358.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T02:37:14Z",
      "cve": "CVE-2026-53358",
      "id": "CVE-2026-53358",
      "initial_release_date": "2026-07-03T03:03:33Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "671",
      "product_status:known_not_affected": "33",
      "product_status:recommended": "250",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53358",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53358.json",
      "version": "11"
    }
  }
}



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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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.