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Permalink CVE-2026-63976
8.8 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Adjacent (A)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Adjacent (A)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 6 days, 9 hours ago Activity log
  • Created & dismissed (max. allowed matches exceeded) suggestion
Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: l2cap: clear chan->ident on ECRED reconfiguration success l2cap_ecred_reconf_rsp() returns early on success without clearing chan->ident. Every other L2CAP response handler (l2cap_ecred_conn_rsp, l2cap_le_connect_rsp, l2cap_config_rsp) clears chan->ident after a successful transaction to prevent the channel from matching subsequent responses with the recycled ident value. A remote attacker that completed a reconfiguration as the peer can replay a failure response with the stale ident, causing the kernel to match and destroy the already-established channel via l2cap_chan_del(chan, ECONNRESET). Clear chan->ident for all matching channels on success, and harden the failure path by using l2cap_chan_hold_unless_zero() consistent with other L2CAP handlers (l2cap_le_command_rej, __l2cap_get_chan_by_ident).

Affected products

Linux
  • <5.7
  • <f39049304ba655ffcbb92edbdf8c51a1f1210bed
  • <00e1950716c6ed67d74777b2db286b0fa23b4be9
  • =<6.18.*
  • =<7.0.*
  • <59f5ecf6ad5c4db6ae81965a96156954a3b0d89a
  • =<6.12.*
  • =<5.15.*
  • ==5.7
  • =<6.1.*
  • =<*
  • =<6.6.*
  • <8e7977afaef37c6bd2b2654f1bce6ab40d471147
  • <ae0152d77d101c920769934fb102b18de0c6f526
  • <cc2b4f749de09975bfa06e58bbbad2f6acd4c79c
  • <3b5b5f423b4fd23404a393bda8adba3cd6f74ef1
  • =<5.10.*
  • <c2afd2613fda90107c5e2fe8e855627451749c78