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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.0, < 5.4.125 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8fPatch
- https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3Patch
- https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137Patch
- https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfcPatch
- https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8fPatch
- https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3Patch
- https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137Patch
- https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfcPatch
FAQ
What is CVE-2021-47109?
CVE-2021-47109 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 f...
How severe is CVE-2021-47109?
CVE-2021-47109 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47109?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.