CVE-2021-45402 Information disclosure in n/a

What is CVE-2021-45402?

CVE-2021-45402 is a medium-severity vulnerability in Linux kernel, published on 11 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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."

Weakness: CWE-668

Which versions are affected by CVE-2021-45402?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-45402?

Apply the vendor's patch.

Is CVE-2021-45402 being exploited?

There is no known exploitation of CVE-2021-45402 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-8605, DEBIAN-CVE-2021-45402, GHSA-wj6w-52qh-v4q5, UBUNTU-CVE-2021-45402.