# CVE-2023-52570: linux: In the Linux kernel, the following vulnerability has been resolved:  vfio/mdev: Fix a null-ptr-deref bug for mdev_unr...

CVE-2023-52570 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52570, released March 2, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52570
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 2, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  vfio/mdev: Fix a null-ptr-deref bug for mdev_unregister_parent()  Inject fault while probing mdpy.ko, if kstrdup() of create_dir() fails in kobject_add_internal() in kobject_init_and_add() in mdev_type_add() in parent_create_sysfs_files(), it will return 0 and probe successfully. And when rmmod mdpy.ko, the mdpy_dev_exit() will call mdev_unregister_parent(), the mdev_type_remove() may traverse uninitialized parent->types[i] in parent_remove_sysfs_files(), and it will cause below null-ptr-deref.  If mdev_type_add() fails, return the error code and kset_unregister() to fix the issue.   general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN  KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]  CPU: 2 PID: 10215 Comm: rmmod Tainted: G        W        N 6.6.0-rc2+ #20  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014  RIP: 0010:__kobject_del+0x62/0x1c0  Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 51 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 28 48 8d 7d 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 01 00 00 48 8b 75 10 48 89 df 48 8d 6b 3c e8  RSP: 0018:ffff88810695fd30 EFLAGS: 00010202  RAX: dffffc0000000000 RBX: ffffffffa0270268 RCX: 0000000000000000  RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010  RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10233a4ef1  R10: ffff888119d2778b R11: 0000000063666572 R12: 0000000000000000  R13: fffffbfff404e2d4 R14: dffffc0000000000 R15: ffffffffa0271660  FS:  00007fbc81981540(0000) GS:ffff888119d00000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 00007fc14a142dc0 CR3: 0000000110a62003 CR4: 0000000000770ee0  DR0: ffffffff8fb0bce8 DR1: ffffffff8fb0bce9 DR2: ffffffff8fb0bcea  DR3: ffffffff8fb0bceb DR6: 00000000fffe0ff0 DR7: 0000000000000600  PKRU: 55555554  Call Trace:   <TASK>   ? die_addr+0x3d/0xa0   ? exc_general_protection+0x144/0x220   ? asm_exc_general_protection+0x22/0x30   ? __kobject_del+0x62/0x1c0   kobject_del+0x32/0x50   parent_remove_sysfs_files+0xd6/0x170 [mdev]   mdev_unregister_parent+0xfb/0x190 [mdev]   ? mdev_register_parent+0x270/0x270 [mdev]   ? find_module_all+0x9d/0xe0   mdpy_dev_exit+0x17/0x63 [mdpy]   __do_sys_delete_module.constprop.0+0x2fa/0x4b0   ? module_flags+0x300/0x300   ? __fput+0x4e7/0xa00   do_syscall_64+0x35/0x80   entry_SYSCALL_64_after_hwframe+0x46/0xb0  RIP: 0033:0x7fbc813221b7  Code: 73 01 c3 48 8b 0d d1 8c 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 8c 2c 00 f7 d8 64 89 01 48  RSP: 002b:00007ffe780e0648 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0  RAX: ffffffffffffffda RBX: 00007ffe780e06a8 RCX: 00007fbc813221b7  RDX: 000000000000000a RSI: 0000000000000800 RDI: 000055e214df9b58  RBP: 000055e214df9af0 R08: 00007ffe780df5c1 R09: 0000000000000000  R10: 00007fbc8139ecc0 R11: 0000000000000206 R12: 00007ffe780e0870  R13: 00007ffe780e0ed0 R14: 000055e214df9260 R15: 000055e214df9af0   </TASK>  Modules linked in: mdpy(-) mdev vfio_iommu_type1 vfio [last unloaded: mdpy]  Dumping ftrace buffer:     (ftrace buffer empty)  ---[ end trace 0000000000000000 ]---  RIP: 0010:__kobject_del+0x62/0x1c0  Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 51 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6b 28 48 8d 7d 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 01 00 00 48 8b 75 10 48 89 df 48 8d 6b 3c e8  RSP: 0018:ffff88810695fd30 EFLAGS: 00010202  RAX: dffffc0000000000 RBX: ffffffffa0270268 RCX: 0000000000000000  RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010  RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed10233a4ef1  R10: ffff888119d2778b R11: 0000000063666572 R12: 0000000000000000  R13: fffffbfff404e2d4 R14: dffffc0000000000 R15: ffffffffa0271660  FS:  00007fbc81981540(0000) GS:ffff888119d00000(000 ---truncated---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.64-1 | [DEBIAN-CVE-2023-52570](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52570.md) | Mar 2, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.5.6-1 | [DEBIAN-CVE-2023-52570](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52570.md) | Mar 2, 2024 |
| Linux | linux Debian 14 | 6.5.6-1 | [DEBIAN-CVE-2023-52570](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52570.md) | Mar 2, 2024 |

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