CVE-2024-50077 (GCVE-0-2024-50077)
Vulnerability from cvelistv5
Published
2024-10-29 00:50
Modified
2026-05-11 20:44
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix multiple init when debugfs is disabled If bt_debugfs is not created successfully, which happens if either CONFIG_DEBUG_FS or CONFIG_DEBUG_FS_ALLOW_ALL is unset, then iso_init() returns early and does not set iso_inited to true. This means that a subsequent call to iso_init() will result in duplicate calls to proto_register(), bt_sock_register(), etc. With CONFIG_LIST_HARDENED and CONFIG_BUG_ON_DATA_CORRUPTION enabled, the duplicate call to proto_register() triggers this BUG(): list_add double add: new=ffffffffc0b280d0, prev=ffffffffbab56250, next=ffffffffc0b280d0. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:35! Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 2 PID: 887 Comm: bluetoothd Not tainted 6.10.11-1-ao-desktop #1 RIP: 0010:__list_add_valid_or_report+0x9a/0xa0 ... __list_add_valid_or_report+0x9a/0xa0 proto_register+0x2b5/0x340 iso_init+0x23/0x150 [bluetooth] set_iso_socket_func+0x68/0x1b0 [bluetooth] kmem_cache_free+0x308/0x330 hci_sock_sendmsg+0x990/0x9e0 [bluetooth] __sock_sendmsg+0x7b/0x80 sock_write_iter+0x9a/0x110 do_iter_readv_writev+0x11d/0x220 vfs_writev+0x180/0x3e0 do_writev+0xca/0x100 ... This change removes the early return. The check for iso_debugfs being NULL was unnecessary, it is always NULL when iso_inited is false.
References
Impacted products
Vendor Product Version
Linux Linux Version: ccf74f2390d60a2f9a75ef496d2564abb478f46a
Version: ccf74f2390d60a2f9a75ef496d2564abb478f46a
Version: ccf74f2390d60a2f9a75ef496d2564abb478f46a
Version: ccf74f2390d60a2f9a75ef496d2564abb478f46a
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          "value": "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."
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