316 lines
17 KiB
JSON
316 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90093",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.786Z",
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"datePublished": "2026-09-17T16:06:06.843Z",
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"dateUpdated": "2026-10-30T12:34:05.630Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:34:05.630Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: access chan->conn safely in get/setsockopt\n\nSince commit b66774b48dd9 (\"Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref\")\nl2cap_chan::conn has held reference and remains non-NULL also after the\ncorresponding hci_conn is deleted. In this state accessing various\nfields eg. hci_conn::hdev is invalid, which leads to KASAN crash in\nl2cap_sock_setsockopt() access of conn->hcon->hdev.\n\nCheck l2cap_chan::conn.hcon corresponds to an alive hci_conn before\ntrying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in\ngetsockopt/setsockopt to ensure it stays alive, and to avoid data races\nin l2cap_chan fields."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is reached from __sys_setsockopt/__sys_getsockopt_iter into l2cap_sock_setsockopt()/l2cap_sock_getsockopt(), which dereference chan->conn->hcon->hdev after the HCI device is already gone; the trigger is the local BT_FLUSHABLE/BT_SECURITY/BT_PHY sockopt, not a received L2CAP or HCI PDU. Syzbot frees that hdev via vhci_release()->hci_unregister_dev(), which an in-range peer cannot invoke.\nAC:L - After b66774b48dd9, l2cap_chan_del() sets FLAG_DEL but leaves chan->conn non-NULL, so a later setsockopt(SOL_BLUETOOTH, BT_FLUSHABLE, BT_FLUSHABLE_OFF) deterministically hits lmp_no_flush_capable(conn->hcon->hdev) on the deleted hci_conn. The attacker opens the L2CAP socket, tears down the controller (close of /dev/vhci), then issues the sockopt; no un-controllable race or rare config is required.\nPR:L - l2cap_sock_create() requires capable(CAP_NET_RAW) only for SOCK_RAW; SOCK_SEQPACKET/STREAM/DGRAM L2CAP sockets used here have no capability gate, and vhci_open() likewise has no capable() check. An unprivileged init_net user who can open /dev/vhci (or an equivalent HCI node) can create the socket, unregister the controller, and call setsockopt without real root.\nUI:N - The attacker owns both the AF_BLUETOOTH/BTPROTO_L2CAP fd and the teardown fd: they connect, close /dev/vhci so hci_conn_hash_flush()->l2cap_conn_del() runs, then call setsockopt on their still-open socket. No other user must pair, mount, or click anything.\nS:U - l2cap_sock_setsockopt() is using a dangling hci_dev through l2cap_conn->hcon after hci_release_dev(); the resulting slab UAF stays inside the host kernel Bluetooth stack and does not cross a VM, IOMMU, or sandbox authority.\nC:H - KASAN reports a use-after-free/OOB read in l2cap_sock_setsockopt() of conn->hcon->hdev (lmp_no_flush_capable() reads hdev->features[0][6]; getsockopt BT_SECURITY/BT_PHY and L2CAP_CONNINFO also read hcon fields). The freed hci_dev slab was reused as skbuff_small_head, so spraying that object yields a kernel-memory read primitive through the dangling hdev pointer.\nI:H - The same dangling conn->hcon remains usable from setsockopt after FLAG_DEL: BT_SECURITY on an ATT socket calls smp_conn_security(conn->hcon) which touches hcon->hdev flags and hcon->pending_sec_level, and BT_PHY calls hci_conn_set_phy() on that hcon. A sprayed hci_dev in place of the freed object supplies function pointers (send/reset/workqueues) for write and control-flow hijack.\nA:H - Syzbot crashed in l2cap_sock_setsockopt+0x22c3 (net/bluetooth/l2cap_sock.c:1003) with both KASAN slab-out-of-bounds and use-after-free reads of the released hci_dev after vhci_release()->hci_release_dev(). Any such UAF dereference oopses or panics the kernel and can be repeated by open/connect/close/setsockopt."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bluetooth/l2cap_sock.c"
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],
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"versions": [
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{
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"version": "8f90405a4a6f1f1880dc07996b47bf57c712bd8a",
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"lessThan": "c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b",
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"lessThan": "737b80c97aef10404a9beed7c0ed45fcd5fc5931",
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"status": "affected",
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},
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{
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"version": "8922c7940bae9ce4b1736dddb6362370793835c2",
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"status": "affected",
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{
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"version": "91047a4396a8b1857a6f712a90cf33ec0012b189",
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"lessThan": "19e154d794eb4d33d99ca4a087b1cea9d5e65786",
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"status": "affected",
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},
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"version": "0b0e2bf39cf99e458d991b9df253727e036a7d7d",
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"lessThan": "3af72bf8f73c519ee562e6963d5ff8e678924f93",
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"status": "affected",
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"version": "d3b739db5dc6f688a60d56da872fabaf65246032",
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"lessThan": "8460dc49c9756a1e9288218060b4d41e1b704905",
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"status": "affected",
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},
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{
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"version": "b66774b48dd98f07254951f74ea6f513efe7ff8b",
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"status": "affected",
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},
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{
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"version": "b66774b48dd98f07254951f74ea6f513efe7ff8b",
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"lessThan": "ca2c4c26498643f421d35ffe258fafbd3ed461c3",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "50c38d9f42a529691e4e67ea9cedf4f0bfc8d277",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.10.265",
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"lessThan": "5.10.273",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.216",
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"lessThan": "5.15.224",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.183",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.145",
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"lessThan": "6.6.160",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.12.97",
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"lessThan": "6.12.114",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.39",
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"lessThan": "6.18.57",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "7.1.4",
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"lessThan": "7.2",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/bluetooth/l2cap_sock.c"
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],
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"versions": [
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{
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"version": "7.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.273",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.224",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c66cd500ba1a58b3798c468fcc774ed2c8c2ec7d"
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},
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{
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"url": "https://git.kernel.org/stable/c/737b80c97aef10404a9beed7c0ed45fcd5fc5931"
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},
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{
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"url": "https://git.kernel.org/stable/c/0d7b7b31ea092e17d757bd24e2e9028ba5e3a4ca"
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},
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{
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"url": "https://git.kernel.org/stable/c/19e154d794eb4d33d99ca4a087b1cea9d5e65786"
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},
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{
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"url": "https://git.kernel.org/stable/c/3af72bf8f73c519ee562e6963d5ff8e678924f93"
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},
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{
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"url": "https://git.kernel.org/stable/c/8460dc49c9756a1e9288218060b4d41e1b704905"
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},
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{
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"url": "https://git.kernel.org/stable/c/f49321c85785178214fd67f2e9b4b73d6363783b"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca2c4c26498643f421d35ffe258fafbd3ed461c3"
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}
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],
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"title": "Bluetooth: L2CAP: access chan->conn safely in get/setsockopt",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |