CVE-2020-28588

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-10 · updated 2026-06-17
Weakness: CWE-681

Description

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 kernel: 5.4.66, 5.9.8, 5.10-rc4

References

https://talosintelligence.com/vulnerability_reports/TALOS-2020-1211
https://talosintelligence.com/vulnerability_reports/TALOS-2020-1211

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