{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38118", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.986Z", "datePublished": "2025-07-03T08:35:25.992Z", "dateUpdated": "2026-08-05T11:59:42.682Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:59:42.682Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete\n\nThis reworks MGMT_OP_REMOVE_ADV_MONITOR to not use mgmt_pending_add to\navoid crashes like bellow:\n\n==================================================================\nBUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406\nRead of size 8 at addr ffff88801c53f318 by task kworker/u5:5/5341\n\nCPU: 0 UID: 0 PID: 5341 Comm: kworker/u5:5 Not tainted 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work\nCall Trace:\n \n dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xd2/0x2b0 mm/kasan/report.c:521\n kasan_report+0x118/0x150 mm/kasan/report.c:634\n mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406\n hci_cmd_sync_work+0x261/0x3a0 net/bluetooth/hci_sync.c:334\n process_one_work kernel/workqueue.c:3238 [inline]\n process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402\n kthread+0x711/0x8a0 kernel/kthread.c:464\n ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \n\nAllocated by task 5987:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1039 [inline]\n mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252\n mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279\n remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5454\n hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719\n hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg+0x219/0x270 net/socket.c:727\n sock_write_iter+0x258/0x330 net/socket.c:1131\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x548/0xa90 fs/read_write.c:686\n ksys_write+0x145/0x250 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFreed by task 5989:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:68\n kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576\n poison_slab_object mm/kasan/common.c:247 [inline]\n __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264\n kasan_slab_free include/linux/kasan.h:233 [inline]\n slab_free_hook mm/slub.c:2380 [inline]\n slab_free mm/slub.c:4642 [inline]\n kfree+0x18e/0x440 mm/slub.c:4841\n mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242\n mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9366\n hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314\n __sys_bind_socket net/socket.c:1810 [inline]\n __sys_bind+0x2c3/0x3e0 net/socket.c:1841\n __do_sys_bind net/socket.c:1846 [inline]\n __se_sys_bind net/socket.c:1844 [inline]\n __x64_sys_bind+0x7a/0x90 net/socket.c:1844\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Both halves of the race are local syscalls — a `sendmsg()` of MGMT_OP_REMOVE_ADV_MONITOR on an AF_BLUETOOTH/BTPROTO_HCI socket bound to HCI_CHANNEL_CONTROL, and a `bind()` to HCI_CHANNEL_USER (or HCIDEVDOWN) that drives `mgmt_index_removed()`. No over-the-air or remote-peer data participates; a Bluetooth peer cannot inject mgmt commands.\nAC:L - The attacker owns both sides: one thread loops REMOVE_ADV_MONITOR commands (the work is dispatched through the hci_cmd_sync workqueue, widening the window between the unlocked `pending_find()` check and the `cmd->param` dereference), while another loops the index-removal path, and the sequence can be retried indefinitely until the free lands mid-callback.\nPR:L - Reaching the opcode requires HCI_SOCK_TRUSTED, granted by CAP_NET_ADMIN — a delegable capability routinely held by the non-root bluetoothd service account and Android's sandboxed Bluetooth process, not full init-namespace root, so compromising that already remotely-exposed daemon yields the primitive.\nUI:N - The attacker performs every step itself — queueing the mgmt command and tearing down/claiming the HCI index — with no victim action, pairing, or user-initiated Bluetooth operation required.\nS:U - The use-after-free and all downstream corruption stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `mgmt_pending_cmd` is dereferenced for `cmd->param` and `cmd->sk` in both `mgmt_remove_adv_monitor_complete()` and the old `mgmt_adv_monitor_removed()`, so a heap-sprayed replacement lets the attacker point `cp` at arbitrary kernel memory whose contents are echoed back through the mgmt event socket in the command-complete reply.\nI:H - `mgmt_pending_remove()` on the already-unlinked object performs a `list_del` unlink write through attacker-sprayable pointers, and the path adds a second `kfree(cmd->param)`/`kfree(cmd)` double-free plus a spurious `sock_put()` refcount underflow — sufficient for controlled writes and control-flow hijack.\nA:H - Even unweaponized the flaw oopses the kernel, as reproduced by syzbot's KASAN slab-use-after-free in `mgmt_remove_adv_monitor_complete+0xe5/0x540`, and it can be re-triggered in a loop for repeated denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/bluetooth/hci_core.h", "net/bluetooth/hci_core.c", "net/bluetooth/mgmt.c" ], "versions": [ { "version": "66bd095ab5d408af106808cce302406542f70f65", "lessThan": "3c9aba9cbdf163e2654be9f82d43ff8a04273962", "status": "affected", "versionType": "git" }, { "version": "66bd095ab5d408af106808cce302406542f70f65", "lessThan": "9f66b6531c2b4e996bb61720ee94adb4b2e8d1be", "status": "affected", "versionType": "git" }, { "version": "66bd095ab5d408af106808cce302406542f70f65", "lessThan": "9df3e5e7f7e4653fd9802878cedc36defc5ef42d", "status": "affected", "versionType": "git" }, { "version": "66bd095ab5d408af106808cce302406542f70f65", "lessThan": "32aa2fbe319f33b0318ec6f4fceb63879771a286", "status": "affected", "versionType": "git" }, { "version": "66bd095ab5d408af106808cce302406542f70f65", "lessThan": "e6ed54e86aae9e4f7286ce8d5c73780f91b48d1c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/net/bluetooth/hci_core.h", "net/bluetooth/hci_core.c", "net/bluetooth/mgmt.c" ], "versions": [ { "version": "5.12", "status": "affected" }, { "version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.142", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.94", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "5.12", "versionEndExcluding": "6.1.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.6.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "6.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3c9aba9cbdf163e2654be9f82d43ff8a04273962" }, { "url": "https://git.kernel.org/stable/c/9f66b6531c2b4e996bb61720ee94adb4b2e8d1be" }, { "url": "https://git.kernel.org/stable/c/9df3e5e7f7e4653fd9802878cedc36defc5ef42d" }, { "url": "https://git.kernel.org/stable/c/32aa2fbe319f33b0318ec6f4fceb63879771a286" }, { "url": "https://git.kernel.org/stable/c/e6ed54e86aae9e4f7286ce8d5c73780f91b48d1c" } ], "title": "Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:19.342Z" } } ] } }