Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously.

Timeline

1. Jul 19, 2026, 2:56 PM UTCCVE published
2. Oct 16, 2026, 3:34 PM UTCCISA SSVC assessment

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

3. Oct 19, 2026, 8:17 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 3c8eaa91eb433c450426539290be4ffe282e9f00; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in ecfed1e0d8efecad6737a0d83e21d2fd021d8c48; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in e6833e737a51db1e5ea0401322acf5e22abd8be6; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 6319b38fe69f56ed95680ade485b957a53fff642; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 291eec1041c918c460dc9702e44edd17794b4a4b; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 41e29548b5e8b5e5fcf708786b3bea67cab107fa; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in d153b8898c0051eb8b6a083b35cbe304a5886bd5; From 15f02b91056253e8cdc592888f431da0731337b8 · fixed in 41c2713b204e6cb6a94587bc6bf6935107df5479

• Linux Linux

  5.7

• KernelLinux

  From 5.7.0 · 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