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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2021-47109

neighbour: allow NUD_NOARP entries to be forced GCed

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 58956317c8de52009d1a38a721474c24aef74fe7 to < d99029e6aab62aef0a0251588b2867e77e83b137affected
  • 58956317c8de52009d1a38a721474c24aef74fe7 to < d17d47da59f726dc4c87caebda3a50333d7e2fd3affected
  • 58956317c8de52009d1a38a721474c24aef74fe7 to < ddf088d7aaaaacfc836104f2e632b29b1d383cfcaffected
  • 58956317c8de52009d1a38a721474c24aef74fe7 to < 7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8faffected

Linux Linux

Default version status: affected

  • 5.0affected
  • 0 to < 5.0unaffected
  • 5.4.125 to ≤ 5.4.*unaffected
  • 5.10.43 to ≤ 5.10.*unaffected
  • 5.12.10 to ≤ 5.12.*unaffected
  • 5.13 to ≤ *unaffected

References