The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.
History

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cve-icon MITRE Information

Status: PUBLISHED

Assigner: canonical

Published: 2021-03-23T00:00:00

Updated: 2021-11-12T18:06:17

Reserved: 2021-03-16T00:00:00


Link: CVE-2021-3444

JSON object: View

cve-icon NVD Information

Status : Analyzed

Published: 2021-03-23T18:15:13.627

Modified: 2021-12-02T19:37:08.323


Link: CVE-2021-3444

JSON object: View

cve-icon Redhat Information

No data.