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 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
Linux Linux kernel<5.7
Redhat 3scale=2.0
Redhat Openstack=13
Redhat Virtualization Host=4.0
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=8.0
Redhat Enterprise Linux Aus=7.4
Redhat Enterprise Linux Server Tus=7.4
Redhat Messaging Realtime Grid=2.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
openSUSE Leap=15.1
openSUSE Leap=15.2
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.10
Canonical Ubuntu Linux=20.04
redhat/kernel<5.7
5.7
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.112-1
6.11.5-1
6.11.7-1

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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