CVE-2026-63975

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 3c8eaa91eb433c450426539290be4ffe282e9f00affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < ecfed1e0d8efecad6737a0d83e21d2fd021d8c48affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < e6833e737a51db1e5ea0401322acf5e22abd8be6affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 6319b38fe69f56ed95680ade485b957a53fff642affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 291eec1041c918c460dc9702e44edd17794b4a4baffected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 41e29548b5e8b5e5fcf708786b3bea67cab107faaffected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < d153b8898c0051eb8b6a083b35cbe304a5886bd5affected
LinuxLinux15f02b91056253e8cdc592888f431da0731337b8 < 41c2713b204e6cb6a94587bc6bf6935107df5479affected
LinuxLinux5.7affected
LinuxLinux0 < 5.7unaffected
LinuxLinux5.10.259 <= 5.10.*unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References