high
7.5
CWE
319
Advisory Published
CVE Published
Updated

CVE-2020-25645

First published: Wed Sep 16 2020(Updated: )

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

Credit: secalert@redhat.com

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/Linux kernel<5.9
5.9
Linux Kernel<5.9.0
Linux Kernel=5.9.0
Linux Kernel=5.9.0-rc1
Linux Kernel=5.9.0-rc2
Linux Kernel=5.9.0-rc3
Linux Kernel=5.9.0-rc4
Linux Kernel=5.9.0-rc5
Linux Kernel=5.9.0-rc6
Debian GNU/Linux=9.0
Debian GNU/Linux=10.0
netapp solidfire \& hci management node
netapp solidfire \& hci storage node
openSUSE=15.1
openSUSE=15.2
All of
NetApp HCI Compute Node BIOS
netapp hci compute node
Ubuntu Linux=14.04
Ubuntu Linux=16.04
Ubuntu Linux=18.04
Ubuntu Linux=20.04
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.15-1
Debian=9.0
Debian=10.0
NetApp HCI Compute Node BIOS
netapp hci compute node
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=20.04

Remedy

A possible workaround for this flaw is to configure IPsec for all traffic between the endpoints, instead of specifically for the UDP port used by the GENEVE tunnels. If GENEVE tunnels are not used, this flaw will not be triggered. In that case, it is possible to disable those tunnels, by unloading the "geneve" kernel module and blacklisting it (See https://access.redhat.com/solutions/41278 for a guide on how to blacklist modules).

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1883988

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-25645?

    CVE-2020-25645 has a high severity rating due to the potential for unencrypted traffic between Geneve endpoints.

  • How do I fix CVE-2020-25645?

    To address CVE-2020-25645, you should upgrade to the Linux kernel version 5.9 or later.

  • Which versions of the Linux kernel are affected by CVE-2020-25645?

    CVE-2020-25645 affects Linux kernel versions prior to 5.9-rc7.

  • What impact does CVE-2020-25645 have on network security?

    CVE-2020-25645 could allow attackers to intercept and read unencrypted traffic between Geneve tunnel endpoints.

  • Is IPsec configuration sufficient to protect against CVE-2020-25645?

    No, IPsec configuration may not provide adequate protection for traffic on specific UDP ports used by the GENEVE tunnel as per CVE-2020-25645.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203