SB20240711204 - Input validation error in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2021-3714)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

A flaw was found in the Linux kernels memory deduplication mechanism. Previous work has shown that memory deduplication can be attacked via a local exploitation mechanism. The same technique can be used if an attacker can upload page sized files and detect the change in access time from a networked service to determine if the page has been merged.

Remediation

Install update from vendor's website.

References

• https://arxiv.org/pdf/2111.08553.pdf
• https://access.redhat.com/security/cve/CVE-2021-3714
• https://bugzilla.redhat.com/show_bug.cgi?id=1931327
• https://arxiv.org/abs/2111.08553