Out-of-bounds write in Linux kernel - CVE-2021-42008
Published: May 25, 2022 / Updated: November 10, 2022
Vulnerability identifier: #VU63669
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2021-42008
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a boundary error in the decode_data() function in drivers/net/hamradio/6pack.c in the Linux kernel. A local user can send input from a process that has the CAP_NET_ADMIN capability and escalate privileges on the system.
How to mitigate CVE-2021-42008
Install updates from vendor's website.
Sources
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=19d1532a187669ce86d5a2696eb7275310070793
- https://www.youtube.com/watch?v=d5f9xLK8Vhw
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.13
- https://security.netapp.com/advisory/ntap-20211104-0002/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html