{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54210", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:44.500Z", "datePublished": "2025-12-30T12:11:08.682Z", "dateUpdated": "2026-08-05T09:18:04.882Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:18:04.882Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()\n\nKASAN reports that there's a use-after-free in\nhci_remove_adv_monitor(). Trawling through the disassembly, you can\nsee that the complaint is from the access in bt_dev_dbg() under the\nHCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because\nmsft_remove_monitor() can end up freeing the monitor\nstructure. Specifically:\n hci_remove_adv_monitor() ->\n msft_remove_monitor() ->\n msft_remove_monitor_sync() ->\n msft_le_cancel_monitor_advertisement_cb() ->\n hci_free_adv_monitor()\n\nLet's fix the problem by just stashing the relevant data when it's\nstill valid." } ], "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 - The vulnerable code is reached only through a local `AF_BLUETOOTH` HCI control socket carrying `MGMT_OP_REMOVE_ADV_MONITOR` (or via bluetoothd acting on a local D-Bus client); no Bluetooth peer, radio frame, or network packet participates in triggering the free-then-read.\nAC:L - The attacker deterministically drives the sequence by adding an advertisement monitor and then removing it — no race must be won, and on MSFT-capable controllers (Intel/Realtek/Qualcomm/MediaTek, i.e. most real hardware) the offending branch is the default path.\nPR:L - The mgmt handler nominally requires a trusted socket, but on stock Linux/ChromeOS systems an unprivileged local user drives the exact same add/remove monitor sequence through BlueZ's AdvertisementMonitorManager1 D-Bus interface, and monitors are auto-removed when the unprivileged client disconnects.\nUI:N - The attacking process performs the register/unregister sequence itself; no victim action, mount, or file open is needed.\nS:U - The freed object, the stale read, and the resulting impact all live in the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed slab object whose contents can be groomed during the sleeping `msft_remove_addr_filters_sync()` window, and the recycled heap contents are emitted into the kernel log — a repeatable heap-disclosure primitive usable against KASLR.\nI:H - Use-after-free of a `struct adv_monitor` with an attacker-influenceable reallocation window is a memory-corruption class defect; the dangling reference to a reclaimed slab object is the standard building block for heap-spray driven corruption.\nA:H - Dereferencing the freed monitor oopses the kernel when the backing slab page has been returned to the page allocator or under KASAN/panic_on_warn, and the sequence can be repeated at will to crash the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_core.c" ], "versions": [ { "version": "7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c", "lessThan": "0d4d6b083da9b033ddccef72d77f373c819ae3ea", "status": "affected", "versionType": "git" }, { "version": "7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c", "lessThan": "bf00c2c8f6254f44ac041aa9a311ae9e0caf692b", "status": "affected", "versionType": "git" }, { "version": "7cf5c2978f23fdbb2dd7b4e8b07e362ae2d8211c", "lessThan": "de6dfcefd107667ce2dbedf4d9337f5ed557a4a1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/bluetooth/hci_core.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "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": "6.0", "versionEndExcluding": "6.1.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.4.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0d4d6b083da9b033ddccef72d77f373c819ae3ea" }, { "url": "https://git.kernel.org/stable/c/bf00c2c8f6254f44ac041aa9a311ae9e0caf692b" }, { "url": "https://git.kernel.org/stable/c/de6dfcefd107667ce2dbedf4d9337f5ed557a4a1" } ], "title": "Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()", "x_generator": { "engine": "bippy-1.2.0" } } } }