CVE-2020-12656 — MEDIUM (5.5)

Q: How severe is CVE-2020-12656?

CVE-2020-12656 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2020-12656?

Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux, Opensuse Leap.

Vulnerability Description

gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls, leading to a memory leak. Note: This was disputed with the assertion that the issue does not grant any access not already available. It is a problem that on unloading a specific kernel module some memory is leaked, but loading kernel modules is a privileged operation. A user could also write a kernel module to consume any amount of memory they like and load that replicating the effect of this bug

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Linux	Linux Kernel	<= 5.6.10
Canonical	Ubuntu Linux	14.04
Opensuse	Leap	15.1

Related Weaknesses (CWE)

CWE-401

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.htmlMailing ListThird Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=206651Issue TrackingVendor Advisory
https://usn.ubuntu.com/4483-1/Third Party Advisory
https://usn.ubuntu.com/4485-1/Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.htmlMailing ListThird Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=206651Issue TrackingVendor Advisory
https://usn.ubuntu.com/4483-1/Third Party Advisory
https://usn.ubuntu.com/4485-1/Third Party Advisory

FAQ

What is CVE-2020-12656?

CVE-2020-12656 is a vulnerability with a CVSS score of 5.5 (MEDIUM). gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks certain domain_release calls, leading to a memory leak. Note: This...

How severe is CVE-2020-12656?

CVE-2020-12656 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-12656?

Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux, Opensuse Leap.