Input validation error in Linux kernel - CVE-2020-10773

Vulnerability identifier: #VU46814

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-10773

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to gain access to sensitive information.

A stack information leak flaw was found in s390/s390x in the Linux kernel’s memory manager functionality, where it incorrectly writes to the /proc/sys/vm/cmm_timeout file. A local privileges user can gain access to sensitive data in the memory.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
kernel (Red Hat package)

Install update from vendor's website.

kernel (Red Hat package) - update to 4.18.0-240.el8

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10773
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b8e51a6a9db94bc1fb18ae831b3dab106b5a4b5f

• Information disclosure in Linux kernel
• Red Hat Enterprise Linux 8 update for kernel