7.8

CVE-2021-47520

In the Linux kernel, the following vulnerability has been resolved:

can: pch_can: pch_can_rx_normal: fix use after free

After calling netif_receive_skb(skb), dereferencing skb is unsafe.
Especially, the can_frame cf which aliases skb memory is dereferenced
just after the call netif_receive_skb(skb).

Reordering the lines solves the issue.
Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.37 < 4.4.295
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.293
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.258
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.221
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.165
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.85
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.8
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.02% 0.033
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.