medium
6.7
CWE
120 119
Advisory Published
CVE Published
Updated

CVE-2020-25211: Buffer Overflow

First published: Wed Sep 09 2020(Updated: )

A flaw was found in the Linux kernel. A local attacker, able to inject conntrack netlink configuration, could overflow a local buffer causing crashes or triggering the use of incorrect protocol numbers in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-1160.21.1.rt56.1158.el7
0:3.10.0-1160.21.1.rt56.1158.el7
redhat/kernel<0:3.10.0-1160.21.1.el7
0:3.10.0-1160.21.1.el7
redhat/kernel<0:3.10.0-693.87.1.el7
0:3.10.0-693.87.1.el7
redhat/kernel<0:3.10.0-957.76.1.el7
0:3.10.0-957.76.1.el7
redhat/kernel<0:3.10.0-1062.49.1.el7
0:3.10.0-1062.49.1.el7
redhat/kernel-rt<0:4.18.0-240.10.1.rt7.64.el8_3
0:4.18.0-240.10.1.rt7.64.el8_3
redhat/kernel<0:4.18.0-240.10.1.el8_3
0:4.18.0-240.10.1.el8_3
redhat/kernel<0:4.18.0-147.38.1.el8_1
0:4.18.0-147.38.1.el8_1
redhat/kernel-rt<0:4.18.0-193.46.1.rt13.96.el8_2
0:4.18.0-193.46.1.rt13.96.el8_2
redhat/kernel<0:4.18.0-193.46.1.el8_2
0:4.18.0-193.46.1.el8_2
Linux kernel<=5.8.7
Debian=9.0
Debian=10.0
Fedora=31
Fedora=32
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.17-1

Remedy

To mitigate this issue, prevent module nf_conntrack_netlink from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Alternatively, if nf_conntrack_netlink is being used, on Red Hat Enterprise Linux 8, you can disable unprivileged user namespaces by setting user.max_user_namespaces to 0: # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1cc5ef91d2ff94d2bf2de3b3585423e8a1051cb6

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-25211?

    CVE-2020-25211 has been classified with a high severity level due to its potential to cause crashes and trigger incorrect protocol numbers.

  • How do I fix CVE-2020-25211?

    To mitigate CVE-2020-25211, update your Linux kernel to the patched versions specified in the security advisories of your distribution.

  • What systems are affected by CVE-2020-25211?

    CVE-2020-25211 affects various versions of the Linux kernel across multiple distributions including Red Hat, Debian, and Fedora.

  • Is CVE-2020-25211 exploited in the wild?

    As of the current date, there are no confirmed reports of CVE-2020-25211 being actively exploited in the wild.

  • What type of vulnerability is CVE-2020-25211?

    CVE-2020-25211 is a local buffer overflow vulnerability in the Linux kernel's conntrack netlink configuration.

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