CVE-2026-90093
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.
How to fix
- Linux Linuxc66cd500ba1a58b3798c468fcc774ed2c8c2ec7d, 737b80c97aef10404a9beed7c0ed45fcd5fc5931, 0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca, 19e154d794eb4d33d99ca4a087b1cea9d5e65786, 3af72bf8f73c519ee562e6963d5ff8e678924f93, 8460dc49c9756a1e9288218060b4d41e1b704905, f49321c85785178214fd67f2e9b4b73d6363783b, ca2c4c26498643f421d35ffe258fafbd3ed461c3, 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8f90405a4a6f1f1880dc07996b47bf57c712bd8a ≤ v < c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d, 32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b ≤ v < 737b80c97aef10404a9beed7c0ed45fcd5fc5931, 8922c7940bae9ce4b1736dddb6362370793835c2 ≤ v < 0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca, 91047a4396a8b1857a6f712a90cf33ec0012b189 ≤ v < 19e154d794eb4d33d99ca4a087b1cea9d5e65786, 0b0e2bf39cf99e458d991b9df253727e036a7d7d ≤ v < 3af72bf8f73c519ee562e6963d5ff8e678924f93, d3b739db5dc6f688a60d56da872fabaf65246032 ≤ v < 8460dc49c9756a1e9288218060b4d41e1b704905, b66774b48dd98f07254951f74ea6f513efe7ff8b ≤ v < f49321c85785178214fd67f2e9b4b73d6363783b, b66774b48dd98f07254951f74ea6f513efe7ff8b ≤ v < ca2c4c26498643f421d35ffe258fafbd3ed461c3, 50c38d9f42a529691e4e67ea9cedf4f0bfc8d277, 5.10.265 ≤ v < 5.10.273, 5.15.216 ≤ v < 5.15.224, 6.1.183 ≤ v < 6.1.191, 6.6.145 ≤ v < 6.6.160, 6.12.97 ≤ v < 6.12.114, 6.18.39 ≤ v < 6.18.57, 7.1.4 ≤ v < 7.2, 7.2 | c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d, 737b80c97aef10404a9beed7c0ed45fcd5fc5931, 0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca, 19e154d794eb4d33d99ca4a087b1cea9d5e65786, 3af72bf8f73c519ee562e6963d5ff8e678924f93, 8460dc49c9756a1e9288218060b4d41e1b704905, f49321c85785178214fd67f2e9b4b73d6363783b, ca2c4c26498643f421d35ffe258fafbd3ed461c3, 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.114, 6.18.57, 7.2 |
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