CVE-2026-98108

CVE CVE-2026-98108EUVD EUVD-2026-86939Published 2026-09-25T10:35:56.000ZLast changed 2026-09-25T14:42:05.000ZCVSS 7.5

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan l2cap_new_connection() sets default value of channel mode to match the parent channel. l2cap_le_connect_req() left this at the default, and created L2CAP_MODE_EXT_FLOWCTL channels if listening pchan has that mode. This causes FLAG_DEFER_SETUP channels to reply to L2CAP_LE_CONN_REQ with L2CAP_ECRED_CONN_RSP, which is incorrect. It can also result to stack OOB write (of l2cap_alloc_cid determined values) in l2cap_ecred_rsp_defer(), as l2cap_le_connect_req() does not limit maximum number of deferred channels or check for duplicate ident. Fix by setting chan->mode correctly in l2cap_le_connect_req(). Also check channel mode in l2cap_ecred_rsp_defer(), and do WARN_ON_ONCE instead of OOB write to make it less brittle.

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 15f02b91056253e8cdc592888f431da0731337b8 <6cb79e6499228cfdbd4b3301371ce74d01cd2f80; 15f02b91056253e8cdc592888f431da0731337b8 <5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1; patch: 7.3-rc2; patch: 7.2.7; 15f02b91056253e8cdc592888f431da0731337b8 <1074bcc57f741223f9fa82ce6afe5c3d783e4d10; patch: 6.12.111; patch: 6.18.53; 5.7; 15f02b91056253e8cdc592888f431da0731337b8 <4ef05db5b08b176a551b4a6287372045998806b0; 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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