CVE-2021-45402

MEDIUM

Linux Kernel < 5.16 - Exposure to Wrong Actor

Title source: rule

Description

The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

References (3)

[Exploit, Patch, Vendor Advisory] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3cf2b61eb06765e27fec6799292d9fb46d0b7e60

[Exploit, Patch, Vendor Advisory] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b1a7288dedc6caf9023f2676b4f5ed34cf0d4029

[Patch, Vendor Advisory] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e572ff80f05c33cd0cb4860f864f5c9c044280b6

Scores

CVSS v3 5.5

EPSS 0.0007

EPSS Percentile 21.1%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Classification

CWE

CWE-668

Status published

Affected Products (6)

linux/linux_kernel < 5.16

linux/linux_kernel

Timeline

Published Feb 11, 2022

Tracked Since Feb 18, 2026