CVE-2021-47456

can: peak_pci: peak_pci_remove(): fix UAF

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

Category

8.4
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.05%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38 patch
https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9 patch
https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250 patch
https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9 patch
https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699 patch
https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69 patch
https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d patch
https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98 patch

Frequently Asked Questions

What is the severity of CVE-2021-47456?
CVE-2021-47456 has been scored as a high severity vulnerability.
How to fix CVE-2021-47456?
To fix CVE-2021-47456, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47456 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47456 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47456?
CVE-2021-47456 affects Linux Linux, Linux Linux.
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