CVE-2021-47456

HighCVSS 8.4/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 8.4/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416CWE-467

Affected software

VendorProductVersions
LinuxLinux>= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 1c616528ba4aeb1125a06b407572ab7b56acae38; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 447d44cd2f67a20b596ede3ca3cd67086dfd9ca9; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 34914971bb3244db4ce2be44e9438a9b30c56250; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < adbda14730aacce41c0d3596415aa39ad63eafd9; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 1248582e47a9f7ce0ecd156c39fc61f8b6aa3699; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 28f28e4bc3a5e0051faa963f10b778ab38c1db69; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 0e5afdc2315b0737edcf55bede4ee1640d2d464d; >= e6d9c80b7ca1504411ad6d7acdb8683e4ae1c9cd, < 949fe9b35570361bc6ee2652f89a0561b26eec98
LinuxLinux3.4
linuxlinux_kernele6d9c80b7ca1
linuxlinux_kernel3.4
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—
linuxlinux_kernel—

References

Timeline

Published
May 22, 2024
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2021-47456: High severity, CVSS 8.4 | Vulnix