UNKNOWN NVD
CVE-2026-79609
XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV guest page table en
XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown
(CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV
guest page table entries from guest-chosen root page tables to the Xen-
chosen one which is in actual use by hardware. To read the guest root
page table, the directmap is used. PV guests, however, have a directmap
which may not cover all memory; in particular this is the case if any
memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address
boundary.
References
- https://xenbits.xenproject.org/xsa/advisory-516.html
- http://xenbits.xen.org/xsa/advisory-516.html
- https://www.openwall.com/lists/oss-security/2026/10/13/5
This unknown severity vulnerability was published on 2026-10-13 via NVD.
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