CVE-2026-63976

CVE CVE-2026-63976EUVD EUVD-2026-45749Published 2026-07-19T14:56:01.000ZLast changed 2026-08-05T12:37:47.000ZCVSS 8.8

What the advisory describes

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).

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 5.15.210; 5.7; 15f02b91056253e8cdc592888f431da0731337b8 <3b5b5f423b4fd23404a393bda8adba3cd6f74ef1; 15f02b91056253e8cdc592888f431da0731337b8 <ae0152d77d101c920769934fb102b18de0c6f526; 15f02b91056253e8cdc592888f431da0731337b8 <f39049304ba655ffcbb92edbdf8c51a1f1210bed; patch: 7.0.12; patch: 7.1; patch: 6.18.35; 15f02b91056253e8cdc592888f431da0731337b8 <00e1950716c6ed67d74777b2db286b0fa23b4be9; patch: 5.10.259; 15f02b91056253e8cdc592888f431da0731337b8 <cc2b4f749de09975bfa06e58bbbad2f6acd4c79c; 15f02b91056253e8cdc592888f431da0731337b8 <c2afd2613fda90107c5e2fe8e855627451749c78; patch: 6.1.176; patch: 6.12.93; 15f02b91056253e8cdc592888f431da0731337b8 <59f5ecf6ad5c4db6ae81965a96156954a3b0d89a; 15f02b91056253e8cdc592888f431da0731337b8 <8e7977afaef37c6bd2b2654f1bce6ab40d471147; patch: 6.6.143; patch: 0

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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