ghsa-w7f8-76rv-q749
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
atm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().
syzbot reported a warning below during atm_dev_register(). [0]
Before creating a new device and procfs/sysfs for it, atm_dev_register() looks up a duplicated device by __atm_dev_lookup(). These operations are done under atm_dev_mutex.
However, when removing a device in atm_dev_deregister(), it releases the mutex just after removing the device from the list that __atm_dev_lookup() iterates over.
So, there will be a small race window where the device does not exist on the device list but procfs/sysfs are still not removed, triggering the splat.
Let's hold the mutex until procfs/sysfs are removed in atm_dev_deregister().
[0]: proc_dir_entry 'atm/atmtcp:0' already registered WARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377 Modules linked in: CPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377 Code: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 <0f> 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48 RSP: 0018:ffffc9000466fa30 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248 RDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001 RBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140 R13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444 FS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: proc_create_data+0xbe/0x110 fs/proc/generic.c:585 atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361 atm_dev_register+0x46d/0x890 net/atm/resources.c:113 atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369 atmtcp_attach drivers/atm/atmtcp.c:403 [inline] atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464 do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159 sock_do_ioctl+0x115/0x280 net/socket.c:1190 sock_ioctl+0x227/0x6b0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f38b3b74459 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459 RDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005 RBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f R10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac R13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b
{
"affected": [],
"aliases": [
"CVE-2025-38245"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-07-09T11:15:26Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: Release atm_dev_mutex after removing procfs in atm_dev_deregister().\n\nsyzbot reported a warning below during atm_dev_register(). [0]\n\nBefore creating a new device and procfs/sysfs for it, atm_dev_register()\nlooks up a duplicated device by __atm_dev_lookup(). These operations are\ndone under atm_dev_mutex.\n\nHowever, when removing a device in atm_dev_deregister(), it releases the\nmutex just after removing the device from the list that __atm_dev_lookup()\niterates over.\n\nSo, there will be a small race window where the device does not exist on\nthe device list but procfs/sysfs are still not removed, triggering the\nsplat.\n\nLet\u0027s hold the mutex until procfs/sysfs are removed in\natm_dev_deregister().\n\n[0]:\nproc_dir_entry \u0027atm/atmtcp:0\u0027 already registered\nWARNING: CPU: 0 PID: 5919 at fs/proc/generic.c:377 proc_register+0x455/0x5f0 fs/proc/generic.c:377\nModules linked in:\nCPU: 0 UID: 0 PID: 5919 Comm: syz-executor284 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025\nRIP: 0010:proc_register+0x455/0x5f0 fs/proc/generic.c:377\nCode: 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 a2 01 00 00 48 8b 44 24 10 48 c7 c7 20 c0 c2 8b 48 8b b0 d8 00 00 00 e8 0c 02 1c ff 90 \u003c0f\u003e 0b 90 90 48 c7 c7 80 f2 82 8e e8 0b de 23 09 48 8b 4c 24 28 48\nRSP: 0018:ffffc9000466fa30 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae248\nRDX: ffff888026280000 RSI: ffffffff817ae255 RDI: 0000000000000001\nRBP: ffff8880232bed48 R08: 0000000000000001 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000001 R12: ffff888076ed2140\nR13: dffffc0000000000 R14: ffff888078a61340 R15: ffffed100edda444\nFS: 00007f38b3b0c6c0(0000) GS:ffff888124753000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f38b3bdf953 CR3: 0000000076d58000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n proc_create_data+0xbe/0x110 fs/proc/generic.c:585\n atm_proc_dev_register+0x112/0x1e0 net/atm/proc.c:361\n atm_dev_register+0x46d/0x890 net/atm/resources.c:113\n atmtcp_create+0x77/0x210 drivers/atm/atmtcp.c:369\n atmtcp_attach drivers/atm/atmtcp.c:403 [inline]\n atmtcp_ioctl+0x2f9/0xd60 drivers/atm/atmtcp.c:464\n do_vcc_ioctl+0x12c/0x930 net/atm/ioctl.c:159\n sock_do_ioctl+0x115/0x280 net/socket.c:1190\n sock_ioctl+0x227/0x6b0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f38b3b74459\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f38b3b0c198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00007f38b3bfe318 RCX: 00007f38b3b74459\nRDX: 0000000000000000 RSI: 0000000000006180 RDI: 0000000000000005\nRBP: 00007f38b3bfe310 R08: 65732f636f72702f R09: 65732f636f72702f\nR10: 65732f636f72702f R11: 0000000000000246 R12: 00007f38b3bcb0ac\nR13: 00007f38b3b0c1a0 R14: 0000200000000200 R15: 00007f38b3bcb03b\n \u003c/TASK\u003e",
"id": "GHSA-w7f8-76rv-q749",
"modified": "2025-07-17T18:31:11Z",
"published": "2025-07-09T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38245"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/26248d5d68c865b888d632162abbf8130645622c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2a8dcee649d12f69713f2589171a1caf6d4fa439"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4bb1bb438134d9ee6b97cc07289dd7c569092eec"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6922f1a048c090f10704bbef4a3a1e81932d2e0a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a433791aeaea6e84df709e0b9584b9bbe040cd1c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ae539d963a17443ec54cba8a767e4ffa318264f4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b2e40fcfe1575faaa548f87614006d3fe44c779e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/cabed6ba92a9a8c09da02a3f20e32ecd80989896"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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