CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
57.6%
Issue Overview:
An out-of-bounds write flaw was found in the Linux kernel’s seq_file in the Filesystem layer. This flaw allows a local attacker with a user privilege to gain access to out-of-bound memory, leading to a system crash or a leak of internal kernel information. The issue results from not validating the size_t-to-int conversion prior to performing operations. The highest threat from this vulnerability is to data integrity, confidentiality and system availability. (CVE-2021-33909)
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-4.14.238-182.422.amzn2.aarch64
kernel-headers-4.14.238-182.422.amzn2.aarch64
kernel-debuginfo-common-aarch64-4.14.238-182.422.amzn2.aarch64
perf-4.14.238-182.422.amzn2.aarch64
perf-debuginfo-4.14.238-182.422.amzn2.aarch64
python-perf-4.14.238-182.422.amzn2.aarch64
python-perf-debuginfo-4.14.238-182.422.amzn2.aarch64
kernel-tools-4.14.238-182.422.amzn2.aarch64
kernel-tools-devel-4.14.238-182.422.amzn2.aarch64
kernel-tools-debuginfo-4.14.238-182.422.amzn2.aarch64
kernel-devel-4.14.238-182.422.amzn2.aarch64
kernel-debuginfo-4.14.238-182.422.amzn2.aarch64
i686:
kernel-headers-4.14.238-182.422.amzn2.i686
src:
kernel-4.14.238-182.422.amzn2.src
x86_64:
kernel-4.14.238-182.422.amzn2.x86_64
kernel-headers-4.14.238-182.422.amzn2.x86_64
kernel-debuginfo-common-x86_64-4.14.238-182.422.amzn2.x86_64
perf-4.14.238-182.422.amzn2.x86_64
perf-debuginfo-4.14.238-182.422.amzn2.x86_64
python-perf-4.14.238-182.422.amzn2.x86_64
python-perf-debuginfo-4.14.238-182.422.amzn2.x86_64
kernel-tools-4.14.238-182.422.amzn2.x86_64
kernel-tools-devel-4.14.238-182.422.amzn2.x86_64
kernel-tools-debuginfo-4.14.238-182.422.amzn2.x86_64
kernel-devel-4.14.238-182.422.amzn2.x86_64
kernel-debuginfo-4.14.238-182.422.amzn2.x86_64
kernel-livepatch-4.14.238-182.422-1.0-0.amzn2.x86_64
Red Hat: CVE-2021-33909
Mitre: CVE-2021-33909
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
57.6%