Latest Vulnerabilities and Exploits



CVE ID:

CVE-2021-3444

Details:

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.

References:

:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809
:https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809
:https://www.openwall.com/lists/oss-security/2021/03/23/2
:https://www.openwall.com/lists/oss-security/2021/03/23/2
MLIST:[oss-security] 20210323 [-2021-3444] Linux kernel bpf verifier incorrect mod32 truncation
:http://www.openwall.com/lists/oss-security/2021/03/23/2