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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-28698

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by o

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Status
Published
Published
Updated
Assigning organization
XEN

Description

long running loops in grant table handling In order to properly monitor resource use, Xen maintains information on the grant mappings a domain may create to map grants offered by other domains. In the process of carrying out certain actions, Xen would iterate over all such entries, including ones which aren't in use anymore and some which may have been created but never used. If the number of entries for a given domain is large enough, this iterating of the entire table may tie up a CPU for too long, starving other domains or causing issues in the hypervisor itself. Note that a domain may map its own grants, i.e. there is no need for multiple domains to be involved here. A pair of "cooperating" guests may, however, cause the effects to be more severe.

Affected products

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

Xen xen

  • 4.14.xaffected

Xen xen

  • unspecified to < 4.12unknown
  • 4.15.x to < unspecifiedaffected
  • next of xen-unstable to < unspecifiedunaffected

Xen xen

  • 4.13.xaffected

Xen xen

  • 4.11.xaffected

Xen xen

  • 4.12.xaffected

References