CVE-2021-38166 is an integer overflow and out-of-bounds write vulnerability in the Linux kernel's BPF hashtable implementation (kernel/bpf/hashtab.c), affecting versions through 5.13.8, including various Debian and Fedora distributions. Rated 7.8 HIGH, this local vulnerability (AV:L/AC:L/PR:L) allows an attacker with CAP_SYS_ADMIN privileges to achieve high confidentiality, integrity, and availability impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, suggesting it is not widely targeted.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 5.13.8CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
33CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | ||
34CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | ||
11.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8 there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.
Aug 10, 2021kernel: integer overflow and out-of-bounds write in kernel/bpf/hashtab.c when many elements are placed in a single bucket
Aug 7, 2021