Oracle Linux: CVE-2020-28588: ELSA-2021-9141: Unbreakable Enterprise kernel-container security update (IMPORTANT) (Multiple Advisories)

An information disclosure vulnerability exists in the /proc/pid/syscall functionality of Linux Kernel 5.1 Stable and 5.4.66. More specifically, this issue has been introduced in v5.1-rc4 (commit 631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0) and is still present in v5.10-rc4, so it’s likely that all versions in between are affected. An attacker can read /proc/pid/syscall to trigger this vulnerability, which leads to the kernel leaking memory contents.
A flaw read uninitialized values in the Linux kernel syscall implementation on 32 bit-systems was found in the way user reading /proc/self/syscall.
A local user could use this flaw to read three 64 bits uninitialized values, but cannot control which values. The highest threat from this vulnerability is to confidentiality.