264 lines
15 KiB
JSON
264 lines
15 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-2026-90091",
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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": "2026-09-17T16:06:05.478Z",
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"dateUpdated": "2026-10-19T08:57:49.423Z"
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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": "2026-10-19T08:57:49.423Z"
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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: fix race l2cap_sock_cleanup_listen() vs. put_chan\n\nFor L2CAP sockets without owning sk->sk_socket, reading\nl2cap_pi(sk)->chan may race against concurrent l2cap_sock_kill() ->\nl2cap_sock_put_chan(). This excludes simultaneous proto_ops callbacks,\nbut access in l2cap_sock_cleanup_listen() has unsafe lockless read.\n\n [Task 1] [Task 2 (hdev->workqueue)]\n l2cap_sock_release(parent) l2cap_disconn_cfm\n l2cap_sock_cleanup_listen l2cap_conn_del\n bt_accept_dequeue l2cap_chan_del\n lock_sock(sk) l2cap_sock_teardown_cb\n bt_accept_unlink\n bt_sk(sk)->parent = NULL\n release_sock(sk) ----------------> lock_sock(sk)\n parent = /* NULL */\n lock_sock(sk) <--------------------- release_sock(sk)\n sock_set_flag(sk, SOCK_ZAPPED)\n l2cap_sock_close_cb\n l2cap_sock_kill(sk)\n l2cap_sock_put_chan\n chan = READ l2cap_pi(sk)->chan l2cap_pi(sk)->chan = NULL\n l2cap_chan_hold_unless_zero l2cap_put_chan(chan)\n kref_get_unless_zero(&chan->ref)\n\nTask 1 may observe NULL which causes null-ptr-deref.\n\nFix the race by taking lock_sock() in l2cap_sock_kill() to\nsynchronize with l2cap_sock_cleanup_listen(). hold_unless_zero() is not\nneeded here, l2cap_pi(sk)->chan owns reference if it is non-NULL.\n\nClarify code comments vs. locking."
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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:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 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:A - A nearby peer's HCI Disconnection Complete (hci_disconn_complete_evt → hci_disconn_cfm → l2cap_disconn_cfm on hdev->rx_work) or L2CAP_DISCONN_REQ (l2cap_disconnect_req) runs l2cap_sock_put_chan on an unaccepted child created by L2CAP_CONN_REQ; the transport is Bluetooth radio range, so Adjacent not Network.\nAC:L - The attacker drives both sides: close() of their listening socket runs l2cap_sock_release → l2cap_sock_cleanup_listen → bt_accept_dequeue, while the peer's disconnect concurrently runs l2cap_sock_kill → l2cap_sock_put_chan on that child without lock_sock; repeating connect/disconnect/close hits the window.\nPR:L - l2cap_sock_create() allows unprivileged SOCK_SEQPACKET/SOCK_STREAM (only SOCK_RAW needs CAP_NET_RAW), and l2cap_validate_bredr_psm() permits dynamic PSM >= 0x1001 without CAP_NET_BIND_SERVICE, so listen()+close() needs only a normal local account; AF_BLUETOOTH is init_net-only (bt_sock_create), not a userns CAP_NET_ADMIN path.\nUI:N - The attacker closes their own listening L2CAP socket and, from a radio they control, sends L2CAP_CONN_REQ then disconnect; no other user must pair, accept, or confirm during the race.\nS:U - The race corrupts the host kernel l2cap_chan stored in l2cap_pi(sk)->chan of the unaccepted child; it does not escape a VM, bypass an IOMMU, or leave the kernel's own authority.\nC:H - cleanup_listen loads l2cap_pi(sk)->chan then calls l2cap_chan_hold_unless_zero(); concurrent l2cap_sock_put_chan plus l2cap_conn_del's final l2cap_chan_put can kfree that object first, so kref_get_unless_zero and later l2cap_chan_lock/__set_chan_timer run on a freed kmalloc l2cap_chan that can be sprayed for disclosure.\nI:H - Winning that UAF lets cleanup_listen take l2cap_chan_lock, arm __set_chan_timer, and l2cap_chan_put on a reclaimed fake chan, corrupting mutex/timer/kref state and invoking chan->ops from sprayed memory for hijack.\nA:H - If cleanup_listen observes the NULL stored by l2cap_sock_put_chan, l2cap_chan_hold_unless_zero() calls kref_get_unless_zero(&c->kref) with c==NULL and oopses; the UAF interleaving likewise panics on poisoned slab or a corrupted chan mutex."
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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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"include/net/bluetooth/l2cap.h",
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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": "b39298044e5534612511a2ff5de03ba5f6e7a820",
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"lessThan": "827de6bd2865b22aaabd554540def3b8a33018ab",
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"status": "affected",
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"version": "6fef032af0092ed5ccb767239a9ac1bc38c08a40",
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"lessThan": "32a7bc6e93be36b37fe61f351d312d358195bd61",
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"status": "affected",
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},
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{
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"version": "6.1.178",
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"lessThan": "6.1.188",
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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": "6.6.157",
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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": "6.12.110",
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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": "6.18.40",
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"lessThan": "6.18.52",
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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": "7.1.5",
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"lessThan": "7.2",
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"status": "affected",
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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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"include/net/bluetooth/l2cap.h",
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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": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.157",
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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": "6.12.110",
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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": "6.18.52",
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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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"cpeApplicability": [
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/827de6bd2865b22aaabd554540def3b8a33018ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/7c7ac736b50fa259ed1bdddc18d79523f07c0442"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f8c63fe0097c9f6ea34409f82f79b3894903d91"
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},
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{
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"url": "https://git.kernel.org/stable/c/61d5ddbd524c715b224cbe7e9f01da4e05098b19"
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},
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{
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"url": "https://git.kernel.org/stable/c/32a7bc6e93be36b37fe61f351d312d358195bd61"
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},
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{
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"url": "https://git.kernel.org/stable/c/66d6ef18548ae6d7dd452b84115fc82c0a73a4ea"
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}
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],
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"title": "Bluetooth: L2CAP: fix race l2cap_sock_cleanup_listen() vs. put_chan",
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"x_generator": {
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"engine": "bippy-1.2.0"
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} |