CVE-2021-4135 is a medium-severity memory leak vulnerability affecting the Linux kernel, specifically within the eBPF for the Simulated networking device driver. A local attacker could exploit this flaw by leveraging the nsim_map_alloc_elem function to gain unauthorized access to sensitive data. The vulnerability has a CVSS score of 5.5 (Medium) with a local attack vector and low attack complexity, leading to high confidentiality impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.16CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
5.16CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.16:-:*:*:*:*:*:* | ||
5.16CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:* | ||
5.16CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:* | ||
5.16CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:5.16:rc3:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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.
Jul 12, 2022kernel: Heap information leak in map_lookup_elem function
Dec 15, 2021