DEBIAN-CVE-2021-28701

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Source
https://security-tracker.debian.org/tracker/DEBIAN-CVE-2021-28701
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-28701.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-28701
Upstream
Published
2021-09-08T14:15:08Z
Modified
2025-09-25T02:31:09.137454Z
Summary
[none]
Details

Another race in XENMAPSPACEgranttable handling Guests are permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, are de-allocated when a guest switches (back) from v2 to v1. Freeing such pages requires that the hypervisor enforce that no parallel request can result in the addition of a mapping of such a page to a guest. That enforcement was missing, allowing guests to retain access to pages that were freed and perhaps re-used for other purposes. Unfortunately, when XSA-379 was being prepared, this similar issue was not noticed.

References

Affected packages

Debian:11 / xen

Package

Name
xen
Purl
pkg:deb/debian/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.14.3-1~deb11u1

Affected versions

4.*

4.14.2+25-gb6a8c4f72d-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:12 / xen

Package

Name
xen
Purl
pkg:deb/debian/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.14.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / xen

Package

Name
xen
Purl
pkg:deb/debian/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.14.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / xen

Package

Name
xen
Purl
pkg:deb/debian/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.14.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}