#VU83585 Use-after-free in Linux kernel - CVE-2020-25220
Published: September 10, 2020 / Updated: December 1, 2023
Vulnerability identifier: #VU83585
Vulnerability risk: 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-2020-25220
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 skcd->no_refcnt was not considered during a backport of a patch for #VU49669 (CVE-2020-14356). A local user can trigger a use-after-free error and escalate privileges on the system.
Remediation
Install update from vendor's website.
External links
- https://bugzilla.redhat.com/show_bug.cgi?id=1868453
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.194
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.140
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.233
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.14.y&id=82fd2138a5ffd7e0d4320cdb669e115ee976a26e
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
- https://security.netapp.com/advisory/ntap-20201001-0004/
- https://www.spinics.net/lists/stable/msg405099.html