5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 High
AI Score
Confidence
High
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
0.006 Low
EPSS
Percentile
77.7%
Issue Overview:
A NULL pointer dereference flaw was found in the Linux kernel’s SELinux subsystem. 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. (CVE-2020-10711)
Affected Packages:
kernel
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update kernel to update your system.
New Packages:
aarch64:
kernel-4.14.177-139.254.amzn2.aarch64
kernel-headers-4.14.177-139.254.amzn2.aarch64
kernel-debuginfo-common-aarch64-4.14.177-139.254.amzn2.aarch64
perf-4.14.177-139.254.amzn2.aarch64
perf-debuginfo-4.14.177-139.254.amzn2.aarch64
python-perf-4.14.177-139.254.amzn2.aarch64
python-perf-debuginfo-4.14.177-139.254.amzn2.aarch64
kernel-tools-4.14.177-139.254.amzn2.aarch64
kernel-tools-devel-4.14.177-139.254.amzn2.aarch64
kernel-tools-debuginfo-4.14.177-139.254.amzn2.aarch64
kernel-devel-4.14.177-139.254.amzn2.aarch64
kernel-debuginfo-4.14.177-139.254.amzn2.aarch64
i686:
kernel-headers-4.14.177-139.254.amzn2.i686
src:
kernel-4.14.177-139.254.amzn2.src
x86_64:
kernel-4.14.177-139.254.amzn2.x86_64
kernel-headers-4.14.177-139.254.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.14.177-139.254.amzn2.x86_64
perf-4.14.177-139.254.amzn2.x86_64
perf-debuginfo-4.14.177-139.254.amzn2.x86_64
python-perf-4.14.177-139.254.amzn2.x86_64
python-perf-debuginfo-4.14.177-139.254.amzn2.x86_64
kernel-tools-4.14.177-139.254.amzn2.x86_64
kernel-tools-devel-4.14.177-139.254.amzn2.x86_64
kernel-tools-debuginfo-4.14.177-139.254.amzn2.x86_64
kernel-devel-4.14.177-139.254.amzn2.x86_64
kernel-debuginfo-4.14.177-139.254.amzn2.x86_64
kernel-livepatch-4.14.177-139.254-1.0-0.amzn2.x86_64
Red Hat: CVE-2020-10711
Mitre: CVE-2020-10711
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 High
AI Score
Confidence
High
4.3 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:N/I:N/A:P
0.006 Low
EPSS
Percentile
77.7%