CVE-2021-3444 | BDVDB-2026-150768 Detail

Description#

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.

Impact#

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Exploit#

History#

1. Version 12021-03-23Record published in the CVE List.
2. Version 22024-09-16Most recent update recorded in the CVE List.