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Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()

Type: advisorySource: Official CVE List1 source record

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.

Announced Group revision 1
Original source ↗

CVE-2026-53358

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-2026-53358

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": "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"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_sock.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.93",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.35",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.12",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/l2cap_sock.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53358

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40810 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-53358 · Revision 1Source updated