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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-90093

Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: access chan->conn safely in get/setsockopt Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref") l2cap_chan::conn has held reference and remains non-NULL also after the corresponding hci_conn is deleted. In this state accessing various fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in l2cap_sock_setsockopt() access of conn->hcon->hdev. Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before trying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in getsockopt/setsockopt to ensure it stays alive, and to avoid data races in l2cap_chan fields.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 8f90405a4a6f1f1880dc07996b47bf57c712bd8a to < c66cd500ba1a58b3798c468fcc774ed2c8c2ec7daffected
  • 32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b to < 737b80c97aef10404a9beed7c0ed45fcd5fc5931affected
  • 8922c7940bae9ce4b1736dddb6362370793835c2 to < 0d7b7b31ea092e17d757bd24e2e9028ba5e3a4caaffected
  • 91047a4396a8b1857a6f712a90cf33ec0012b189 to < 19e154d794eb4d33d99ca4a087b1cea9d5e65786affected
  • 0b0e2bf39cf99e458d991b9df253727e036a7d7d to < 3af72bf8f73c519ee562e6963d5ff8e678924f93affected
  • d3b739db5dc6f688a60d56da872fabaf65246032 to < 8460dc49c9756a1e9288218060b4d41e1b704905affected
  • b66774b48dd98f07254951f74ea6f513efe7ff8b to < f49321c85785178214fd67f2e9b4b73d6363783baffected
  • b66774b48dd98f07254951f74ea6f513efe7ff8b to < ca2c4c26498643f421d35ffe258fafbd3ed461c3affected
  • 50c38d9f42a529691e4e67ea9cedf4f0bfc8d277affected
  • 5.10.265 to < 5.10.273affected
  • 5.15.216 to < 5.15.224affected
  • 6.1.183 to < 6.1.191affected
  • 6.6.145 to < 6.6.160affected
  • 6.12.97 to < 6.12.114affected
  • 6.18.39 to < 6.18.57affected
  • 7.1.4 to < 7.2affected

Linux Linux

Default version status: affected

  • 7.2affected
  • 0 to < 7.2unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References