What is CVE-2021-3635?

CVE-2021-3635 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.4/10. Published 2021-08-13.

How severe is CVE-2021-3635?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Buffer overflow in Linux Kernel

CVE-2021-3635

A flaw was found in the Linux kernel netfilter implementation in versions prior to 5.5-rc7. A user with root (CAP_SYS_ADMIN) access is able to panic the system when issuing netfilter netflow commands.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (15.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Linux Linux_kernel — versions 5.5
Fedoraproject Fedora — versions 34
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0
N/a Kernel — versions kernel 5.5-rc7

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2021-3635?: CVE-2021-3635 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 4.4/10. Published 2021-08-13.
How severe is CVE-2021-3635?: Medium severity. CVSS v3 base score is 4.4 out of 10.