Vulnerabilities > CVE-2021-47520 - Use After Free vulnerability in Linux Kernel
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
References
- https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d
- https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76
- https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3
- https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa
- https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4
- https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e
- https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7
- https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db