CVE-2021-4135 Information disclosure in kernel

What is CVE-2021-4135?

CVE-2021-4135 is a medium-severity vulnerability in Linux kernel, published on 14 Jul 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A memory leak vulnerability was found in the Linux kernel's eBPF for the Simulated networking device driver in the way user uses BPF for the device such that function nsim_map_alloc_elem being called. A local user could use this flaw to get unauthorized access to some data.

Weakness: CWE-401, CWE-200

Which versions are affected by CVE-2021-4135?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-4135?

Apply the vendor's patch.

Is CVE-2021-4135 being exploited?

There is no known exploitation of CVE-2021-4135 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
• How this page is made

Also known as AZL-10137, DEBIAN-CVE-2021-4135, UBUNTU-CVE-2021-4135.