medium
5.9
CWE
476
Advisory Published
CVE Published
Updated

CVE-2020-10711: Null Pointer Dereference

First published: Fri Apr 17 2020(Updated: )

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:2.6.32-754.29.2.el6
0:2.6.32-754.29.2.el6
redhat/kernel-rt<0:3.10.0-1127.8.2.rt56.1103.el7
0:3.10.0-1127.8.2.rt56.1103.el7
redhat/kernel<0:3.10.0-1127.8.2.el7
0:3.10.0-1127.8.2.el7
redhat/kernel-alt<0:4.14.0-115.21.2.el7a
0:4.14.0-115.21.2.el7a
redhat/kernel<0:3.10.0-327.88.1.el7
0:3.10.0-327.88.1.el7
redhat/kernel<0:3.10.0-514.76.1.el7
0:3.10.0-514.76.1.el7
redhat/kernel<0:3.10.0-693.67.1.el7
0:3.10.0-693.67.1.el7
redhat/kernel<0:3.10.0-957.54.1.el7
0:3.10.0-957.54.1.el7
redhat/kernel<0:3.10.0-1062.26.1.el7
0:3.10.0-1062.26.1.el7
redhat/kernel-rt<0:4.18.0-193.1.2.rt13.53.el8_2
0:4.18.0-193.1.2.rt13.53.el8_2
redhat/kernel<0:4.18.0-193.1.2.el8_2
0:4.18.0-193.1.2.el8_2
redhat/kernel<0:4.18.0-80.23.2.el8_0
0:4.18.0-80.23.2.el8_0
redhat/kernel<0:4.18.0-147.13.2.el8_1
0:4.18.0-147.13.2.el8_1
redhat/kernel-rt<1:3.10.0-693.67.1.rt56.665.el6
1:3.10.0-693.67.1.rt56.665.el6
redhat/kernel<5.7
5.7
Linux Kernel<5.7
Red Hat 3scale=2.0
redhat openstack=13
redhat virtualization host=4.0
Red Hat Enterprise Linux=6.0
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
redhat enterprise linux aus=7.4
redhat enterprise Linux server tus=7.4
Red Hat Messaging Realtime Grid=2.0
Debian GNU/Linux=8.0
Debian GNU/Linux=9.0
Debian GNU/Linux=10.0
openSUSE=15.1
openSUSE=15.2
Ubuntu Linux=14.04
Ubuntu Linux=16.04
Ubuntu Linux=18.04
Ubuntu Linux=19.10
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=8.0
Debian=9.0
Debian=10.0
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=19.10
Ubuntu=20.04

Remedy

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. This issue can only be resolved by applying updates.

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10711

Remedy

https://www.openwall.com/lists/oss-security/2020/05/12/2

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-10711?

    CVE-2020-10711 has been classified as a moderate vulnerability due to the NULL pointer dereference issue in the Linux kernel's SELinux subsystem.

  • How do I fix CVE-2020-10711?

    To fix CVE-2020-10711, upgrade your Linux kernel to version 5.7 or later, or apply the specific patches available for affected versions.

  • Which Linux kernel versions are affected by CVE-2020-10711?

    CVE-2020-10711 affects Linux kernel versions prior to 5.7.

  • What systems are impacted by CVE-2020-10711?

    Systems running affected versions of the Linux kernel, including various distributions like Red Hat and Debian, are impacted by CVE-2020-10711.

  • Is CVE-2020-10711 a remote code execution vulnerability?

    CVE-2020-10711 is not a remote code execution vulnerability; it involves a local NULL pointer dereference which can lead to a denial of service.

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