Use-after-free in Linux kernel - CVE-2021-47456
Published: May 30, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90060
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-47456
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the peak_pci_remove() function in drivers/net/can/sja1000/peak_pci.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38
- https://git.kernel.org/stable/c/447d44cd2f67a20b596ede3ca3cd67086dfd9ca9
- https://git.kernel.org/stable/c/34914971bb3244db4ce2be44e9438a9b30c56250
- https://git.kernel.org/stable/c/adbda14730aacce41c0d3596415aa39ad63eafd9
- https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699
- https://git.kernel.org/stable/c/28f28e4bc3a5e0051faa963f10b778ab38c1db69
- https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d
- https://git.kernel.org/stable/c/949fe9b35570361bc6ee2652f89a0561b26eec98
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.253
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.214
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.290
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.288
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.76
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.156