CVE-2021-47456

can: peak_pci: peak_pci_remove(): fix UAF

High · published May 22, 2024

CVSS v3.1
8.4
EPSS
0%
Percentile
13.8
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.4 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00236 · 13.8th percentile
Published
2024-05-22T06:19Z
EPSS history
Timeline
  • 22 MAY 06:19Z
    can: peak_pci: peak_pci_remove(): fix UAF
    cvelistv5