CVE-2026-79609

The Xen hypervisor contains a vulnerability where XPTI (Xen Page Table Isolation) may break on huge-memory systems . This occurs because PV guests use a directmap that may not cover all memory if any memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address boundary during the copying of...

CVE-2026-79609 x86: XPTI may break on huge-memory systems

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...

CVE-2026-79609 x86: XPTI may break on huge-memory systems

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...

Revoked but Still Authoritative: An Empirical Study of Revocation Enforcement in Agent-Memory Systems

Long-running language-model agents depend on persistent memory. Many agent-memory systems preserve history through soft revocation: a contradicted fact is marked invalid and retained rather than deleted. However, whether that mark is enforced at retrieval time is unexamined. In this paper, we...

RowHammer Vulnerability Counter (RVC): Redefining RowHammer Detection with Victim-Centric Tracking

The Rowhammer vulnerability poses an increasing challenge with newer generations of DRAM and aggressive technology scaling. Existing mitigation techniques, such as Graphene, Twice, and Hydra, primarily rely on tracking activation counts for each row and issuing refreshes when a row reaches a...

Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002830)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002830 advisory. The BPF subsystem in the Linux kernel before 4.5.5 mishandles reference counts, which allows local users to cause a denial of service use-after-free or possibly have...

SUSE CVE-2016-4558

The BPF subsystem in the Linux kernel before 4.5.5 mishandles reference counts, which allows local users to cause a denial of service use-after-free or possibly have unspecified other impact via a crafted application on 1 a system with more than 32 Gb of memory, related to the program reference...

UBUNTU-CVE-2016-4558

The BPF subsystem in the Linux kernel before 4.5.5 mishandles reference counts, which allows local users to cause a denial of service use-after-free or possibly have unspecified other impact via a crafted application on 1 a system with more than 32 Gb of memory, related to the program reference...