// For flags

CVE-2021-47109

neighbour: allow NUD_NOARP entries to be forced GCed

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*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
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-03-04 CVE Reserved
  • 2024-03-15 CVE Published
  • 2024-03-16 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
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