{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-50077", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-50077" ], "published": "2024-10-29T00:50:48Z", "summary": "Bluetooth: ISO: Fix multiple init when debugfs is disabled", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix multiple init when debugfs is disabled\n\nIf bt_debugfs is not created successfully, which happens if either\nCONFIG_DEBUG_FS or CONFIG_DEBUG_FS_ALLOW_ALL is unset, then iso_init()\nreturns early and does not set iso_inited to true. This means that a\nsubsequent call to iso_init() will result in duplicate calls to\nproto_register(), bt_sock_register(), etc.\n\nWith CONFIG_LIST_HARDENED and CONFIG_BUG_ON_DATA_CORRUPTION enabled, the\nduplicate call to proto_register() triggers this BUG():\n\n list_add double add: new=ffffffffc0b280d0, prev=ffffffffbab56250,\n next=ffffffffc0b280d0.\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:35!\n Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI\n CPU: 2 PID: 887 Comm: bluetoothd Not tainted 6.10.11-1-ao-desktop #1\n RIP: 0010:__list_add_valid_or_report+0x9a/0xa0\n ...\n __list_add_valid_or_report+0x9a/0xa0\n proto_register+0x2b5/0x340\n iso_init+0x23/0x150 [bluetooth]\n set_iso_socket_func+0x68/0x1b0 [bluetooth]\n kmem_cache_free+0x308/0x330\n hci_sock_sendmsg+0x990/0x9e0 [bluetooth]\n __sock_sendmsg+0x7b/0x80\n sock_write_iter+0x9a/0x110\n do_iter_readv_writev+0x11d/0x220\n vfs_writev+0x180/0x3e0\n do_writev+0xca/0x100\n ...\n\nThis change removes the early return. The check for iso_debugfs being\nNULL was unnecessary, it is always NULL when iso_inited is false.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": 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"assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.58" }, "1:6.6.51-1+rpt2": { "linux_commit": "82a50e430ef1d6eb37d78e25aa572c1f6ea56160", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.58" }, "1:6.6.51-1+rpt3": { "linux_commit": "5aeecea9f4a45248bcf564dec924965e066a7bfd", "upstream_version": "6.6.51", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.58" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-50077" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/fa4b832c5a6ec35023a1b997cf658c436619c752" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8fb8e912afb4c47dec12ea9a5853e7a8db95816f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/adf1b179c2ff8073c24bf87e5a605fcc5a09798b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a9b7b535ba192c6b77e6c15a4c82d853163eab8c" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerable path is reached only through a local `AF_BLUETOOTH` HCI control socket (`hci_sock_sendmsg` \u2192 `MGMT_OP_SET_EXP_FEATURE` \u2192 `iso_init`); no Bluetooth radio traffic or remote peer data is involved.\nAC:L - On a kernel built without debugfs (`CONFIG_DEBUG_FS=n` / `DEBUG_FS_ALLOW_NONE`, a common hardening choice on Android and embedded builds) the bug is 100% deterministic \u2014 the attacker simply issues the ISO-socket experimental-feature command twice, with no race to win and no memory layout to groom.\nPR:L - Binding the mgmt control channel requires CAP_NET_ADMIN, which is not full root and is routinely held by non-root service accounts (Android's `bluetooth` UID, containers started with `--cap-add=NET_ADMIN`); a compromised Bluetooth daemon \u2014 itself a well-known remote attack target \u2014 already satisfies this.\nUI:N - The attacker performs both `iso_init()` invocations itself from its own socket; no victim action is needed at any point.\nS:U - The corruption and its effects are confined to kernel data structures within the same security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - The defect leaves a stale `struct proto` linked into the core kernel's global `proto_list` after `bluetooth.ko` is freed, so world-readable `/proc/net/protocols` reads freed module memory, and the double `list_add`/`list_del` sequence leaves a poisoned node whose contents leak on traversal.\nI:H - A double `list_add` on a global kernel list plus a dangling list node means subsequent `proto_register()`/`proto_unregister()` write pointers through stale neighbour links into freed memory, giving a controlled-write primitive once that memory is reallocated.\nA:H - With `CONFIG_LIST_HARDENED`+`CONFIG_BUG_ON_DATA_CORRUPTION` the duplicate `proto_register()` hits `BUG()` in `__list_add_valid_or_report` for an immediate panic; otherwise the corrupted `proto_list` becomes cyclic or poisoned, causing a hang or GPF oops on any `/proc/net/protocols` read." } } }