PT-2020-6447 · Linux+4 · Linux Kernel+4

Pedro Sampaio · Published 2020-01-16 · Updated 2021-11-09 · CVE-2021-3635

Positive Technologies (AI Summary)

CVSS v2.0

4.9

Medium

Base vector

AV:L/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.5-rc7

Description A flaw was found in the Linux kernel netfilter implementation. The issue is caused by a buffer overflow. A user with root (CAP SYS ADMIN) access can panic the system when issuing netfilter netflow commands. This can lead to a denial of service.

Recommendations For versions prior to 5.5-rc7, as a temporary workaround, consider restricting access to netfilter netflow commands until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALSA-2021:4356

ALT-PU-2020-1145

ALT-PU-2020-1251

ALT-PU-2020-1421

ALT-PU-2020-1450

ALT-PU-2020-1714

ALT-PU-2020-2164

ALT-PU-2021-1621

ALT-PU-2021-1656

ALT-PU-2021-1739

ALT-PU-2021-1862

ALT-PU-2021-1866

ALT-PU-2021-1870

BDU:2021-04847

CESA-2021_4140

CESA-2021_4356

CVE-2021-3635

RHSA-2021:4140

RHSA-2021:4356

RHSA-2021_4140

RHSA-2021_4356

Affected Products

Alt Linux

Almalinux

Centos

Linux Kernel

Red Hat

References · 66

• https://osv.dev/vulnerability/CVE-2021-3635 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04847 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-3635 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3635 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3635 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2021:4356 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3635 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-4356.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-3635 · Security Note
• https://wiki.astralinux.ru/astra-linux-se81-bulletin-20241206SE81 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-3635 · Vendor Advisory
• https://vulners.com/cve/CVE-2020-24588 · Note
• https://vulners.com/cve/CVE-2020-24502 · Note
• https://vulners.com/cve/CVE-2021-31440 · Note
• https://vulners.com/cve/CVE-2020-29660 · Note