CVE-2021-47109
Linux Kernel neighbour Table Overflow Vulnerability
Description
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.
INFO
Published Date :
March 15, 2024, 9:15 p.m.
Last Modified :
Feb. 27, 2025, 3:20 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to a patched version.
- Apply available updates using your package manager.
Public PoC/Exploit Available at Github
CVE-2021-47109 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47109.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47109 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47109
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Ini adalah repository kumpulan CVE v.5
allcve cve cvelist newcve
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47109 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47109 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 27, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-190 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 from (excluding) 5.12.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 from (excluding) 5.10.43 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.0 from (excluding) 5.4.125 Added Reference Type CVE: https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f Added Reference https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3 Added Reference https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137 Added Reference https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 15, 2024
Action Type Old Value New Value Added Description 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. Added Reference kernel.org https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f [No types assigned]