Vulnerability Details : CVE-2021-47456

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
Published 2024-05-22 06:19:45
Updated 2024-07-03 01:37:58
Source Linux
View at NVD,   CVE.org
Vulnerability category: Memory Corruption

Products affected by CVE-2021-47456

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Exploit prediction scoring system (EPSS) score for CVE-2021-47456

EPSS FAQ
0.06%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-47456

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
8.4
 HIGH CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.5
5.9
 134c704f-9b21-4f2e-91b3-4a467353bcc0 2024-07-03

CWE ids for CVE-2021-47456

  • 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
    Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
  • The code calls sizeof() on a pointer type, which can be an incorrect calculation if the programmer intended to determine the size of the data that is being pointed to.
    Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

References for CVE-2021-47456

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