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ubuntucveUbuntu.comUB:CVE-2021-27363
HistoryMar 07, 2021 - 12:00 a.m.

CVE-2021-27363

2021-03-0700:00:00
ubuntu.com
ubuntu.com
22

CVSS2

3.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:N/A:P

CVSS3

4.4

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

EPSS

0.001

Percentile

25.8%

An issue was discovered in the Linux kernel through 5.11.3. A kernel
pointer leak can be used to determine the address of the iscsi_transport
structure. When an iSCSI transport is registered with the iSCSI subsystem,
the transport’s handle is available to unprivileged users via the sysfs
file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When
read, the show_transport_handle function (in
drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle.
This handle is actually the pointer to an iscsi_transport struct in the
kernel module’s global variables.

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CVSS2

3.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:L/AC:L/Au:N/C:P/I:N/A:P

CVSS3

4.4

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

EPSS

0.001

Percentile

25.8%