NULL pointer dereference in Linux kernel - CVE-2020-25285
Published: September 13, 2020 / Updated: April 28, 2022
Vulnerability identifier: #VU90669
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-25285
CWE-ID: CWE-476
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 privileged user to execute arbitrary code.
The vulnerability exists due to NULL pointer dereference within the allowed_mems_nr(), hugetlb_sysctl_handler_common() and hugetlb_overcommit_handler() functions in mm/hugetlb.c. A local privileged user can execute arbitrary code.
Remediation
Install update from vendor's website.
External links
- https://twitter.com/grsecurity/status/1303749848898904067
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17743798d81238ab13050e8e2833699b54e15467
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.8
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
- https://security.netapp.com/advisory/ntap-20201009-0002/
- https://usn.ubuntu.com/4576-1/
- https://usn.ubuntu.com/4579-1/
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html