CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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
61.4%
USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately,
that update introduced a regression in overlayfs. This update corrects
the problem.
We apologize for the inconvenience.
Original advisory details:
It was discovered that the btrfs implementation in the Linux kernel did not
properly detect that a block was marked dirty in some situations. An
attacker could use this to specially craft a file system image that, when
unmounted, could cause a denial of service (system crash). (CVE-2019-19377)
It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)
It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Ubuntu | 20.04 | noarch | linux-image-5.4.0-33-generic | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | kernel-signed-image-5.4.0-33-generic-di | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | linux-image-5.4.0-33-generic-dbgsym | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | linux-image-5.4.0-33-lowlatency | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | linux-image-5.4.0-33-lowlatency-dbgsym | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | linux-image-5.4.0-33-generic-lpae | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | block-modules-5.4.0-33-generic-di | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | crypto-modules-5.4.0-33-generic-di | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | fat-modules-5.4.0-33-generic-di | < 5.4.0-33.37 | UNKNOWN |
Ubuntu | 20.04 | noarch | fb-modules-5.4.0-33-generic-di | < 5.4.0-33.37 | UNKNOWN |
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
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
61.4%