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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-53358

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 3634cbdc2eb414b69ffa752ddbe5e0458518e321affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < e1c100e2d61bd8c718b7d91fe3e050780a9bf72daffected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 89dec92041717b027216e110599e4f6d6c921b79affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 50dfec218808b148ab4247b1858031b7a32015c5affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 859d3ace791ed878ae9ba5522c7844d960da8f88affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 7555fd885a0603f50e49a655850a1f2bd8a25398affected
  • 3df91ea20e744344100b10ae69a17211fcf5b207 to < 8c8e620467a7b51562dbcefbd1f09f288d7d710daffected

Linux Linux

Default version status: affected

  • 3.4affected
  • 0 to < 3.4unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 5.15.210 to ≤ 5.15.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References