Description (CNA)
Another race in XENMAPSPACE_grant_table 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Xen / xen | unknown unspecified before 4.12; affected 4.15.x before unspecified; unaffected next of xen-unstable before unspecified |
| Xen / xen | affected 4.11.x |
| Xen / xen | unknown unspecified before 4.12; affected 4.12.x before unspecified; unaffected next of 4.14.x before unspecified |
CWE
No CWE identifiers supplied.
References
- https://xenbits.xenproject.org/xsa/advisory-384.txt
- http://xenbits.xen.org/xsa/advisory-384.html
- http://www.openwall.com/lists/oss-security/2021/09/08/2
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/
- https://www.debian.org/security/2021/dsa-4977
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/
- https://security.gentoo.org/glsa/202208-23
ADP enrichment
No English description supplied.
- https://xenbits.xenproject.org/xsa/advisory-384.txt
- http://xenbits.xen.org/xsa/advisory-384.html
- http://www.openwall.com/lists/oss-security/2021/09/08/2
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L4MI3MQAPGILCLXBGQWPZHGE3ALSO4ZU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEHZLIR5DFYYQBH55AERWHLO54OFU42C/
- https://www.debian.org/security/2021/dsa-4977
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3HEHUIUWSSMCQGQY3GWX4J2SZGYP5W2Z/
- https://security.gentoo.org/glsa/202208-23