CVE-2026-98108Bluetooth: L2CAP: fix chan mode for LE_CONN_REQ + EXT_FLOWCTL pchan
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 15f02b91056253e8cdc592888f431da0731337b8 before ad0f44a3f1f688558ed876a0702bc2c82b0df689; from 15f02b91056253e8cdc592888f431da0731337b8 before 564ae0e05e598aa895b9dbd18cb7d6eb64752869; from 15f02b91056253e8cdc592888f431da0731337b8 before aab17938998b29e75c3324763411aef3e300fc67; 15f02b91056253e8cdc592888f431da0731337b8 builds before 0e1fc7cab95ad958e55d70a5dfaaea687c9c639f; from 15f02b91056253e8cdc592888f431da0731337b8 before 1074bcc57f741223f9fa82ce6afe5c3d783e4d10; 15f02b91056253e8cdc592888f431da0731337b8 builds before 5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1; 15f02b91056253e8cdc592888f431da0731337b8 builds before 6cb79e6499228cfdbd4b3301371ce74d01cd2f80; 15f02b91056253e8cdc592888f431da0731337b8 builds before 4ef05db5b08b176a551b4a6287372045998806b0 | CNA record |
References
- https://git.kernel.org/stable/c/ad0f44a3f1f688558ed876a0702bc2c82b0df689
- https://git.kernel.org/stable/c/564ae0e05e598aa895b9dbd18cb7d6eb64752869
- https://git.kernel.org/stable/c/aab17938998b29e75c3324763411aef3e300fc67
- https://git.kernel.org/stable/c/0e1fc7cab95ad958e55d70a5dfaaea687c9c639f
- https://git.kernel.org/stable/c/1074bcc57f741223f9fa82ce6afe5c3d783e4d10
- https://git.kernel.org/stable/c/5d5a625cbc854d4c4f68e4b16fcf6e682d9a9ed1
- https://git.kernel.org/stable/c/6cb79e6499228cfdbd4b3301371ce74d01cd2f80
- https://git.kernel.org/stable/c/4ef05db5b08b176a551b4a6287372045998806b0
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.