CVE-2021-45485

kernel: information leak in the IPv6 implementation

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

En la implementación de IPv6 en el kernel de Linux versiones anteriores a 5.13.3, el archivo net/ipv6/output_core.c presenta un filtrado de información debido a determinado uso de una tabla hash que, aunque es grande, no considera apropiadamente que atacantes basados en IPv6 pueden elegir típicamente entre muchas direcciones de origen IPv6

An information leak flaw was found in the Linux kernel’s IPv6 implementation in the __ipv6_select_ident in net/ipv6/output_core.c function. The use of a small hash table in IP ID generation allows a remote attacker to reveal sensitive information.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-12-25 CVE Reserved
2021-12-25 CVE Published
2024-08-04 CVE Updated
2024-09-09 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-327: Use of a Broken or Risky Cryptographic Algorithm

CAPEC

References (7)

URL	Tag	Source
https://arxiv.org/pdf/2112.09604.pdf	Technical Description
https://security.netapp.com/advisory/ntap-20220121-0001	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=62f20e068ccc50d6ab66fdb72ba90da2b9418c99	2023-02-24
https://www.oracle.com/security-alerts/cpujul2022.html	2023-02-24

URL	Date	SRC
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.3	2023-02-24
https://access.redhat.com/security/cve/CVE-2021-45485	2022-10-18
https://bugzilla.redhat.com/show_bug.cgi?id=2039911	2022-10-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Netapp Search vendor "Netapp"	All Flash Fabric-attached Storage 8300 Firmware Search vendor "Netapp" for product "All Flash Fabric-attached Storage 8300 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	All Flash Fabric-attached Storage 8300 Search vendor "Netapp" for product "All Flash Fabric-attached Storage 8300"	-	-	Safe
Netapp Search vendor "Netapp"	Fabric-attached Storage 8300 Firmware Search vendor "Netapp" for product "Fabric-attached Storage 8300 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	Fabric-attached Storage 8300 Search vendor "Netapp" for product "Fabric-attached Storage 8300"	-	-	Safe
Netapp Search vendor "Netapp"	All Flash Fabric-attached Storage 8700 Firmware Search vendor "Netapp" for product "All Flash Fabric-attached Storage 8700 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	All Flash Fabric-attached Storage 8700 Search vendor "Netapp" for product "All Flash Fabric-attached Storage 8700"	-	-	Safe
Netapp Search vendor "Netapp"	Fabric-attached Storage 8700 Firmware Search vendor "Netapp" for product "Fabric-attached Storage 8700 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	Fabric-attached Storage 8700 Search vendor "Netapp" for product "Fabric-attached Storage 8700"	-	-	Safe
Netapp Search vendor "Netapp"	Aff A400 Firmware Search vendor "Netapp" for product "Aff A400 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	Aff A400 Search vendor "Netapp" for product "Aff A400"	-	-	Safe
Netapp Search vendor "Netapp"	Fabric-attached Storage A400 Firmware Search vendor "Netapp" for product "Fabric-attached Storage A400 Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	Fabric-attached Storage A400 Search vendor "Netapp" for product "Fabric-attached Storage A400"	-	-	Safe
Netapp Search vendor "Netapp"	Hci Compute Node Firmware Search vendor "Netapp" for product "Hci Compute Node Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	Hci Compute Node Search vendor "Netapp" for product "Hci Compute Node"	-	-	Safe
Netapp Search vendor "Netapp"	H300e Firmware Search vendor "Netapp" for product "H300e Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H300e Search vendor "Netapp" for product "H300e"	-	-	Safe
Netapp Search vendor "Netapp"	H300s Firmware Search vendor "Netapp" for product "H300s Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H300s Search vendor "Netapp" for product "H300s"	-	-	Safe
Netapp Search vendor "Netapp"	H410c Firmware Search vendor "Netapp" for product "H410c Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H410c Search vendor "Netapp" for product "H410c"	-	-	Safe
Netapp Search vendor "Netapp"	H410s Firmware Search vendor "Netapp" for product "H410s Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H410s Search vendor "Netapp" for product "H410s"	-	-	Safe
Netapp Search vendor "Netapp"	H500e Firmware Search vendor "Netapp" for product "H500e Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H500e Search vendor "Netapp" for product "H500e"	-	-	Safe
Netapp Search vendor "Netapp"	H500s Firmware Search vendor "Netapp" for product "H500s Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H500s Search vendor "Netapp" for product "H500s"	-	-	Safe
Netapp Search vendor "Netapp"	H610c Firmware Search vendor "Netapp" for product "H610c Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H610c Search vendor "Netapp" for product "H610c"	-	-	Safe
Netapp Search vendor "Netapp"	H610s Firmware Search vendor "Netapp" for product "H610s Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H610s Search vendor "Netapp" for product "H610s"	-	-	Safe
Netapp Search vendor "Netapp"	H615c Firmware Search vendor "Netapp" for product "H615c Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H615c Search vendor "Netapp" for product "H615c"	-	-	Safe
Netapp Search vendor "Netapp"	H700e Firmware Search vendor "Netapp" for product "H700e Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H700e Search vendor "Netapp" for product "H700e"	-	-	Safe
Netapp Search vendor "Netapp"	H700s Firmware Search vendor "Netapp" for product "H700s Firmware"	-	-	Affected	in	Netapp Search vendor "Netapp"	H700s Search vendor "Netapp" for product "H700s"	-	-	Safe
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.13.3 Search vendor "Linux" for product "Linux Kernel" and version " < 5.13.3"		-		Affected
Netapp Search vendor "Netapp"		E-series Santricity Os Controller Search vendor "Netapp" for product "E-series Santricity Os Controller"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire\, Enterprise Sds \& Hci Storage Node Search vendor "Netapp" for product "Solidfire\, Enterprise Sds \& Hci Storage Node"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire \& Hci Management Node Search vendor "Netapp" for product "Solidfire \& Hci Management Node"				-		-		Affected
Netapp Search vendor "Netapp"		Brocade Fabric Operating System Firmware Search vendor "Netapp" for product "Brocade Fabric Operating System Firmware"				-		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Binding Support Function Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function"				22.1.3 Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Network Exposure Function Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function"				22.1.1 Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy"				22.2.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0"		-		Affected