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Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-64206

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64206

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "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": "3.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.16",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.39",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64206

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40972 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-64206 · Revision 1Source updated