CVE-2021-47109

neighbour: allow NUD_NOARP entries to be forced GCed

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

neighbour: allow NUD_NOARP entries to be forced GCed

IFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to
fill up the neighbour table with enough entries that it will overflow for
valid connections after that.

This behaviour is more prevalent after commit 58956317c8de ("neighbor:
Improve garbage collection") is applied, as it prevents removal from
entries that are not NUD_FAILED, unless they are more than 5s old.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vecino: permite forzar las entradas NUD_NOARP. Las interfaces GCed IFF_POINTOPOINT utilizan entradas NUD_NOARP para IPv6. Es posible llenar la tabla de vecinos con suficientes entradas para que después de eso se desborde de conexiones válidas. Este comportamiento es más frecuente después de aplicar el commit 58956317c8de ("vecino: mejorar la recolección de basura"), ya que evita la eliminación de entradas que no son NUD_FAILED, a menos que tengan más de 5 años de antigüedad.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-03-04 CVE Reserved
2024-03-15 CVE Published
2024-03-16 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (5)

URL	Tag	Source
https://git.kernel.org/stable/c/58956317c8de52009d1a38a721474c24aef74fe7	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137	2021-06-10
https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3	2021-06-10
https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc	2021-06-10
https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f	2021-06-07

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.0 < 5.4.125 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.4.125"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.0 < 5.10.43 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.10.43"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.0 < 5.12.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.12.10"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.0 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.13"		en		Affected