{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54164", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.495Z", "datePublished": "2025-12-30T12:08:40.357Z", "dateUpdated": "2026-08-05T09:17:45.817Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:17:45.817Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix iso_conn related locking and validity issues\n\nsk->sk_state indicates whether iso_pi(sk)->conn is valid. Operations\nthat check/update sk_state and access conn should hold lock_sock,\notherwise they can race.\n\nThe order of taking locks is hci_dev_lock > lock_sock > iso_conn_lock,\nwhich is how it is in connect/disconnect_cfm -> iso_conn_del ->\niso_chan_del.\n\nFix locking in iso_connect_cis/bis and sendmsg/recvmsg to take lock_sock\naround updating sk_state and conn.\n\niso_conn_del must not occur during iso_connect_cis/bis, as it frees the\niso_conn. Hold hdev->lock longer to prevent that.\n\nThis should not reintroduce the issue fixed in commit 241f51931c35\n(\"Bluetooth: ISO: Avoid circular locking dependency\"), since the we\nacquire locks in order. We retain the fix in iso_sock_connect to release\nlock_sock before iso_connect_* acquires hdev->lock.\n\nSimilarly for commit 6a5ad251b7cd (\"Bluetooth: ISO: Fix possible\ncircular locking dependency\"). We retain the fix in iso_conn_ready to\nnot acquire iso_conn_lock before lock_sock.\n\niso_conn_add shall return iso_conn with valid hcon. Make it so also when\nreusing an old CIS connection waiting for disconnect timeout (see\n__iso_sock_close where conn->hcon is set to NULL).\n\nTrace with iso_conn_del after iso_chan_add in iso_connect_cis:\n===============================================================\niso_sock_create:771: sock 00000000be9b69b7\niso_sock_init:693: sk 000000004dff667e\niso_sock_bind:827: sk 000000004dff667e 70:1a:b8:98:ff:a2 type 1\niso_sock_setsockopt:1289: sk 000000004dff667e\niso_sock_setsockopt:1289: sk 000000004dff667e\niso_sock_setsockopt:1289: sk 000000004dff667e\niso_sock_connect:875: sk 000000004dff667e\niso_connect_cis:353: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da\nhci_get_route:1199: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da\nhci_conn_add:1005: hci0 dst 28:3d:c2:4a:7e:da\niso_conn_add:140: hcon 000000007b65d182 conn 00000000daf8625e\n__iso_chan_add:214: conn 00000000daf8625e\niso_connect_cfm:1700: hcon 000000007b65d182 bdaddr 28:3d:c2:4a:7e:da status 12\niso_conn_del:187: hcon 000000007b65d182 conn 00000000daf8625e, err 16\niso_sock_clear_timer:117: sock 000000004dff667e state 3\n \niso_chan_del:153: sk 000000004dff667e, conn 00000000daf8625e, err 16\nhci_conn_del:1151: hci0 hcon 000000007b65d182 handle 65535\nhci_conn_unlink:1102: hci0: hcon 000000007b65d182\nhci_chan_list_flush:2780: hcon 000000007b65d182\niso_sock_getsockopt:1376: sk 000000004dff667e\niso_sock_getname:1070: sock 00000000be9b69b7, sk 000000004dff667e\niso_sock_getname:1070: sock 00000000be9b69b7, sk 000000004dff667e\niso_sock_getsockopt:1376: sk 000000004dff667e\niso_sock_getname:1070: sock 00000000be9b69b7, sk 000000004dff667e\niso_sock_getname:1070: sock 00000000be9b69b7, sk 000000004dff667e\niso_sock_shutdown:1434: sock 00000000be9b69b7, sk 000000004dff667e, how 1\n__iso_sock_close:632: sk 000000004dff667e state 5 socket 00000000be9b69b7\n \nBUG: kernel NULL pointer dereference, address: 0000000000000000\nPGD 8000000006467067 P4D 8000000006467067 PUD 3f5f067 PMD 0\nOops: 0000 [#1] PREEMPT SMP PTI\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014\nRIP: 0010:__iso_sock_close (net/bluetooth/iso.c:664) bluetooth\n===============================================================\n\nTrace with iso_conn_del before iso_chan_add in iso_connect_cis:\n===============================================================\niso_connect_cis:356: 70:1a:b8:98:ff:a2 -> 28:3d:c2:4a:7e:da\n...\niso_conn_add:140: hcon 0000000093bc551f conn 00000000768ae504\nhci_dev_put:1487: hci0 orig refcnt 21\nhci_event_packet:7607: hci0: e\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The freeing side of the race is `iso_conn_del()` driven by HCI connect/disconnect confirmation events, so a Bluetooth peer within radio range can time the `struct iso_conn` free (CIS reject, BIG sync loss, link teardown) against a host ISO socket in `iso_connect_cis`/`iso_connect_bis`. Per Bluetooth subsystem scoring this is Adjacent.\nAC:L - The attacker controls both sides — an unprivileged process repeatedly calls `connect()` with QoS that makes the controller fail the CIG setup, and retries are unlimited — while the stale-`conn->hcon` variant (close, reconnect reusing the CIS, `sendmsg`) needs no race at all and faults deterministically.\nPR:L - An `AF_BLUETOOTH`/`BTPROTO_ISO` socket can be created, bound, configured and connected by any unprivileged local user with no capability check in `bt_sock_create`/`iso_sock_create`, matching prior ISO/SCO conn-lifetime UAFs scored at PR:L.\nUI:N - The attacker's own socket syscalls plus asynchronous HCI event processing trigger the bug; no victim action is required.\nS:U - The corruption is confined to kernel memory within the same security authority — a standard kernel-level compromise with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `iso_conn` is reachable through the dangling `iso_pi(sk)->conn`, and `sendmsg`/`iso_send_frame` dereference `conn->hcon->hdev` from it, so spraying the ~136-byte `kmalloc-192` object with controlled data yields arbitrary-pointer reads and kernel memory disclosure.\nI:H - `__iso_chan_add()` writes `conn->sk = sk` into the freed object and `cancel_delayed_work(&conn->timeout_work)` performs timer-list unlinking through attacker-sprayable memory, giving write primitives that are leverageable for control-flow hijack.\nA:H - The commit documents three distinct kernel crashes — NULL dereference in `__iso_sock_close`, general protection fault in `detach_if_pending` from the freed work item, and NULL dereference in `iso_sock_sendmsg` — any of which panics the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/iso.c" ], "versions": [ { "version": "c524f9561c657b8af26dd4f67092b8928261aa62", "lessThan": "e969bfed84c1f88dc722a678ee08488e86f0ec1a", "status": "affected", "versionType": "git" }, { "version": "241f51931c35085449502c10f64fb3ecd6e02171", "lessThan": "88ad50f2b843a510bd7c922c0a4e2484aff9d645", "status": "affected", "versionType": "git" }, { "version": "241f51931c35085449502c10f64fb3ecd6e02171", "lessThan": "d40ae85ee62e3666f45bc61864b22121346f88ef", "status": "affected", "versionType": "git" }, { "version": "2539cbc625c560d5432e2f0fc04bfe4a889cf737", "status": "affected", "versionType": "git" }, { "version": "6.1.9", "lessThan": "6.1.42", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/iso.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.42", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4.7", "lessThanOrEqual": "6.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.9", "versionEndExcluding": "6.1.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.4.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e969bfed84c1f88dc722a678ee08488e86f0ec1a" }, { "url": "https://git.kernel.org/stable/c/88ad50f2b843a510bd7c922c0a4e2484aff9d645" }, { "url": "https://git.kernel.org/stable/c/d40ae85ee62e3666f45bc61864b22121346f88ef" } ], "title": "Bluetooth: ISO: fix iso_conn related locking and validity issues", "x_generator": { "engine": "bippy-1.2.0" } } } }