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Bluetooth: 6lowpan: avoid untracked enable work

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: avoid untracked enable work lowpan_enable_set() allocates a temporary work item and schedules do_enable_set() on system_wq, then returns to debugfs. The debugfs active operation has ended at that point, but the worker still executes module text and manipulates enable_6lowpan and listen_chan. bt_6lowpan_exit() removes the debugfs files and immediately closes and puts listen_chan. It has no pointer to the queued work item, so it cannot cancel or flush it before tearing down the state that the worker uses. The buggy scenario involves two paths, with each column showing the order within that path: debugfs enable write module exit 1. lowpan_enable_set() allocates 1. bt_6lowpan_exit() removes set_enable work the debugfs file 2. schedule_work() queues 2. bt_6lowpan_exit() closes do_enable_set() and puts listen_chan 3. the write operation returns 3. module teardown can continue 4. do_enable_set() later runs against stale state Run the enable state transition synchronously in lowpan_enable_set() instead. The simple debugfs setter can sleep, and this file already handles the 6LoWPAN control write synchronously under the same set_lock. Once the setter returns, debugfs removal covers the whole operation and exit can no longer race with an untracked work item. Validation reproduced this kernel report: BUG: KASAN: slab-use-after-free in do_enable_set+0x113/0x2e0 Workqueue: events do_enable_set [bluetoot

Announced Source revision 1
Original source ↗

CVE-2026-72337

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-2026-72337

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": "90305829635d90a5053ec99a261035b4ce0a2649",
        "lessThan": "333a39f134dd0bc614ef6658e9ccd448080443d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90305829635d90a5053ec99a261035b4ce0a2649",
        "lessThan": "9061d0c19e97bb8d0aa235d0a571a5d6d0be7477",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90305829635d90a5053ec99a261035b4ce0a2649",
        "lessThan": "31cc289d5b179a37be439043306f518376a58187",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90305829635d90a5053ec99a261035b4ce0a2649",
        "lessThan": "feb3fc2c38ed52003142f31e04109719b200c049",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "90305829635d90a5053ec99a261035b4ce0a2649",
        "lessThan": "352a59dc1f4a41314b6f827c17e16af7ca88271a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bluetooth/6lowpan.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/6lowpan.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72337

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#46505 · Revision 1
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