CVE-2020-28588: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: version 5.4.66 only; version 5.9.8 only; version 5.10 only

Published 2021-05-10. Last modified 2026-06-17.