CVE-2026-64206 (GCVE-0-2026-64206)

Vulnerability from cvelistv5 – Published: 2026-07-20 16:27 – Updated: 2026-08-05 12:40
VLAI
Title
Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.
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
Linux Linux Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < 9901f847a762a5d953871dd95767ce2aed3d684d (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < 4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < 8daaf7f73fe998631a160d1a5a7e1b0b0480eef8 (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < 8de7b386ffad480ca59222b688c94a2da8f0d805 (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < d5616beb3355b5fca2280d796c1cf7ada4ee6551 (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < e96fbac8d3a73b0bc165383c092a30628561d320 (git)
Affected: 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 , < 2641a9e0a1dd4af2e21995470a21d55dd35e5203 (git)
Affected: ee805f9499ebd0edf0877990968543c752043b59 (git)
Affected: 3.15.5 , < 3.16 (semver)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: cancel pending_rx_work before taking conn-\u003elock\n\nl2cap_conn_del() takes conn-\u003elock and then calls cancel_work_sync() for\npending_rx_work.  process_pending_rx() takes the same mutex, so teardown\ncan deadlock against the worker it is flushing.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the l2cap_conn_ready() -\u003e queue_work(...,\n\u0026conn-\u003epending_rx_work) submit path, the l2cap_conn_del() -\u003e\ncancel_work_sync(\u0026conn-\u003epending_rx_work) teardown path, and the\nprocess_pending_rx() -\u003e mutex_lock(\u0026conn-\u003elock) worker edge.  Lockdep\n\n  WARNING: possible circular locking dependency detected\n  process_pending_rx+0x21/0x2a [vuln_msv]\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\n  *** DEADLOCK ***\n\nCancel pending_rx_work before taking conn-\u003elock, matching the existing\nlock-before-drain ordering used for the two delayed works in the same\nteardown path.  The pending_rx queue is still purged after the work has\nbeen cancelled and conn-\u003elock has been acquired."
        }
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      "metrics": [
        {
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            "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"
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              "value": "AV:A - A nearby Bluetooth peer can reach the flaw by establishing an ACL or LE link and supplying L2CAP traffic while forcing connection teardown.\nAC:L - The attacker controls connection establishment, queued traffic, and link termination, and can repeat attempts to win the workqueue race.\nPR:N - The vulnerable link-bring-up and teardown paths are reachable before Bluetooth pairing or authentication and require no attacker privileges.\nUI:N - No victim action is required once the Bluetooth interface is enabled and accepting connections.\nS:U - The vulnerable L2CAP code and the affected kernel resources belong to the same security authority.\nC:H - If the worker has started, work_pending() can be false and teardown can skip synchronization, free the l2cap_conn, and leave process_pending_rx() accessing reclaimed memory, creating an exploitable heap use-after-free.\nI:H - The resumed worker performs mutex and queue operations on the freed, potentially reallocated l2cap_conn, permitting heap corruption and potentially attacker-controlled writes or control-flow hijacking.\nA:H - The documented lock inversion can permanently deadlock connection teardown and the Bluetooth workqueue; the associated use-after-free can also crash or panic the kernel."
            }
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      ],
      "title": "Bluetooth: L2CAP: cancel pending_rx_work before taking conn-\u003elock",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64206",
    "datePublished": "2026-07-20T16:27:53.885Z",
    "dateReserved": "2026-07-19T15:36:31.769Z",
    "dateUpdated": "2026-08-05T12:40:00.926Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-64206",
      "id": "msrc_CVE-2026-64206",
      "initial_release_date": "2026-07-22T01:01:57.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: L2CAP: cancel pending_rx_work before taking conn-\u003elock",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64206.json",
      "version": "2"
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Lockdep\\n\\n  WARNING: possible circular locking dependency detected\\n  process_pending_rx+0x21/0x2a [vuln_msv]\\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\\n  *** DEADLOCK ***\\n\\nCancel pending_rx_work before taking conn-\u003elock, matching the existing\\nlock-before-drain ordering used for the two delayed works in the same\\nteardown path.  The pending_rx queue is still purged after the work has\\nbeen cancelled and conn-\u003elock has been acquired.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"9901f847a762a5d953871dd95767ce2aed3d684d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"8daaf7f73fe998631a160d1a5a7e1b0b0480eef8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"8de7b386ffad480ca59222b688c94a2da8f0d805\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"d5616beb3355b5fca2280d796c1cf7ada4ee6551\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"e96fbac8d3a73b0bc165383c092a30628561d320\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7ab56c3a6eccb215034b0cb096e0313441cbf2a4\",\"lessThan\":\"2641a9e0a1dd4af2e21995470a21d55dd35e5203\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ee805f9499ebd0edf0877990968543c752043b59\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.15.5\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/l2cap_core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.15.5\",\"versionEndExcluding\":\"3.16\",\"matchCriteriaId\":\"7AB7F235-CA17-4469-8F49-E61F880EF22E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.16.1\",\"versionEndExcluding\":\"5.10.261\",\"matchCriteriaId\":\"E43C5DB9-4F77-4188-9338-0A8DA0C64719\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.212\",\"matchCriteriaId\":\"8E99FB01-CD93-41AF-A653-3F450652B9A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.178\",\"matchCriteriaId\":\"092233C7-F4E0-40C8-BD4D-A28FE50DFE20\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.145\",\"matchCriteriaId\":\"7046B092-F810-4440-ACE6-60218518EECE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-27T06:08:38+00:00",
      "cve": "CVE-2026-64206",
      "id": "CVE-2026-64206",
      "initial_release_date": "2026-07-20T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: L2CAP: cancel pending_rx_work before taking conn-\u003elock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64206.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T12:57:59Z",
      "cve": "CVE-2026-64206",
      "id": "CVE-2026-64206",
      "initial_release_date": "2026-07-21T12:57:59Z",
      "product_status:known_affected": "275",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64206",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64206.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





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.