ghsa-f2xj-38h9-6c7g
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
macintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse
The following warning appears when running syzkaller, and this issue also exists in the mainline code.
------------[ cut here ]------------ list_add double add: new=ffffffffa57eee28, prev=ffffffffa57eee28, next=ffffffffa5e63100. WARNING: CPU: 0 PID: 1491 at lib/list_debug.c:35 __list_add_valid_or_report+0xf7/0x130 Modules linked in: CPU: 0 PID: 1491 Comm: syz.1.28 Not tainted 6.6.0+ #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__list_add_valid_or_report+0xf7/0x130 RSP: 0018:ff1100010dfb7b78 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffffa57eee18 RCX: ffffffff97fc9817 RDX: 0000000000040000 RSI: ffa0000002383000 RDI: 0000000000000001 RBP: ffffffffa57eee28 R08: 0000000000000001 R09: ffe21c0021bf6f2c R10: 0000000000000001 R11: 6464615f7473696c R12: ffffffffa5e63100 R13: ffffffffa57eee28 R14: ffffffffa57eee28 R15: ff1100010dfb7d48 FS: 00007fb14398b640(0000) GS:ff11000119600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010d096005 CR4: 0000000000773ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 80000000 Call Trace: input_register_handler+0xb3/0x210 mac_hid_start_emulation+0x1c5/0x290 mac_hid_toggle_emumouse+0x20a/0x240 proc_sys_call_handler+0x4c2/0x6e0 new_sync_write+0x1b1/0x2d0 vfs_write+0x709/0x950 ksys_write+0x12a/0x250 do_syscall_64+0x5a/0x110 entry_SYSCALL_64_after_hwframe+0x78/0xe2
The WARNING occurs when two processes concurrently write to the mac-hid emulation sysctl, causing a race condition in mac_hid_toggle_emumouse(). Both processes read old_val=0, then both try to register the input handler, leading to a double list_add of the same handler.
CPU0 CPU1 ------------------------- ------------------------- vfs_write() //write 1 vfs_write() //write 1 proc_sys_write() proc_sys_write() mac_hid_toggle_emumouse() mac_hid_toggle_emumouse() old_val = valp // old_val=0 old_val = valp // old_val=0 mutex_lock_killable() proc_dointvec() // *valp=1 mac_hid_start_emulation() input_register_handler() mutex_unlock() mutex_lock_killable() proc_dointvec() mac_hid_start_emulation() input_register_handler() //Trigger Warning mutex_unlock()
Fix this by moving the old_val read inside the mutex lock region.
{
"affected": [],
"aliases": [
"CVE-2025-68367"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-24T11:16:00Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacintosh/mac_hid: fix race condition in mac_hid_toggle_emumouse\n\nThe following warning appears when running syzkaller, and this issue also\nexists in the mainline code.\n\n ------------[ cut here ]------------\n list_add double add: new=ffffffffa57eee28, prev=ffffffffa57eee28, next=ffffffffa5e63100.\n WARNING: CPU: 0 PID: 1491 at lib/list_debug.c:35 __list_add_valid_or_report+0xf7/0x130\n Modules linked in:\n CPU: 0 PID: 1491 Comm: syz.1.28 Not tainted 6.6.0+ #3\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014\n RIP: 0010:__list_add_valid_or_report+0xf7/0x130\n RSP: 0018:ff1100010dfb7b78 EFLAGS: 00010282\n RAX: 0000000000000000 RBX: ffffffffa57eee18 RCX: ffffffff97fc9817\n RDX: 0000000000040000 RSI: ffa0000002383000 RDI: 0000000000000001\n RBP: ffffffffa57eee28 R08: 0000000000000001 R09: ffe21c0021bf6f2c\n R10: 0000000000000001 R11: 6464615f7473696c R12: ffffffffa5e63100\n R13: ffffffffa57eee28 R14: ffffffffa57eee28 R15: ff1100010dfb7d48\n FS: 00007fb14398b640(0000) GS:ff11000119600000(0000) knlGS:0000000000000000\n CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 000000010d096005 CR4: 0000000000773ef0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 80000000\n Call Trace:\n \u003cTASK\u003e\n input_register_handler+0xb3/0x210\n mac_hid_start_emulation+0x1c5/0x290\n mac_hid_toggle_emumouse+0x20a/0x240\n proc_sys_call_handler+0x4c2/0x6e0\n new_sync_write+0x1b1/0x2d0\n vfs_write+0x709/0x950\n ksys_write+0x12a/0x250\n do_syscall_64+0x5a/0x110\n entry_SYSCALL_64_after_hwframe+0x78/0xe2\n\nThe WARNING occurs when two processes concurrently write to the mac-hid\nemulation sysctl, causing a race condition in mac_hid_toggle_emumouse().\nBoth processes read old_val=0, then both try to register the input handler,\nleading to a double list_add of the same handler.\n\n CPU0 CPU1\n ------------------------- -------------------------\n vfs_write() //write 1 vfs_write() //write 1\n proc_sys_write() proc_sys_write()\n mac_hid_toggle_emumouse() mac_hid_toggle_emumouse()\n old_val = *valp // old_val=0\n old_val = *valp // old_val=0\n mutex_lock_killable()\n proc_dointvec() // *valp=1\n mac_hid_start_emulation()\n input_register_handler()\n mutex_unlock()\n mutex_lock_killable()\n proc_dointvec()\n mac_hid_start_emulation()\n input_register_handler() //Trigger Warning\n mutex_unlock()\n\nFix this by moving the old_val read inside the mutex lock region.",
"id": "GHSA-f2xj-38h9-6c7g",
"modified": "2025-12-24T12:30:29Z",
"published": "2025-12-24T12:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68367"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1e4b207ffe54cf33a4b7a2912c4110f89c73bf3f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/230621ffdb361d15cd3ef92d8b4fa8d314f4fad4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/388391dd1cc567fcf0b372b63d414c119d23e911"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/48a7d427eb65922b3f17fbe00e2bbc7cb9eac381"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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