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CVE-2026-53358

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 3634cbdc2eb414b69ffa752ddbe5e0458518e321; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in e1c100e2d61bd8c718b7d91fe3e050780a9bf72d; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 89dec92041717b027216e110599e4f6d6c921b79; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 50dfec218808b148ab4247b1858031b7a32015c5; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 859d3ace791ed878ae9ba5522c7844d960da8f88; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 7555fd885a0603f50e49a655850a1f2bd8a25398; From 3df91ea20e744344100b10ae69a17211fcf5b207 · fixed in 8c8e620467a7b51562dbcefbd1f09f288d7d710d

  • Linux Linux

    3.4

  • KernelLinux

    From 3.4.0 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 8

git.kernel.org