CVE-2021-47456
8.4
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability: 2.5 / Impact: 5.9
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
Description
In the Linux kernel, the following vulnerability has been resolved:
can: peak_pci: peak_pci_remove(): fix UAF
When remove the module peek_pci, referencing 'chan' again after
releasing 'dev' will cause UAF.
Fix this by releasing 'dev' later.
The following log reveals it:
[ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537
[ 35.965513 ] Call Trace:
[ 35.965718 ] dump_stack_lvl+0xa8/0xd1
[ 35.966028 ] print_address_description+0x87/0x3b0
[ 35.966420 ] kasan_report+0x172/0x1c0
[ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170
[ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.967945 ] __asan_report_load8_noabort+0x14/0x20
[ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci]
[ 35.968752 ] pci_device_remove+0xa9/0x250
Affected (13)
Products: Linux: Linux Kernel
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| 3.4 ≤ version < 4.4.290 |
Related CWEs
CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-467
Use of sizeof() on a Pointer Type
The code calls sizeof() on a malloced pointer type, which always returns the wordsize/8. This can produce an unexpected result if the programmer intended to determine how much memory has been allocated.
References (16)
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Source: af854a3a-2127-422b-91ae-364da2661108
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Timeline
No history available yet.