page_table_walk

Capture the Flag in Physical Memory You've read about paging. The diagrams make sense. Four levels, 9 bits each, page frame, offset. Sure. But then you hit a challenge that requires actually walking page tables, and you realize you don't know it. You know about it. Big difference. What worked for...

CVE-2026-80719

A flaw was found in the Linux kernel's Multi-Generational Least Recently Used MGLRU page table walker. When memory cgroup memcg reparenting occurs concurrently with page table walks, stale batch updates can lead to an underestimation of the number of pages. This can prevent the kernel from...

CVE-2026-80633

A flaw was found in the Linux kernel's iommufd component. A local user could trigger a kernel warning by releasing the last reference on a Direct Memory Access Buffer DMABUF-backed IOMMU page table without holding the necessary dmaresv lock. This missing lock operation can lead to system...

KVM-Januscape

KVM-XJ: parche en caliente dumptool.py encuentra los offsets automáticamente; para saber cómo usarlo, lee el código tú mismo. Resumen de la vulnerabilidad CVE-2026-53359 Januscape es una vulnerabilidad de use-after-free UAF en el MMU sombra de KVM del kernel de Linux. Tiempo latente: 16 años agos...

UBUNTU-CVE-2026-80719

In the Linux kernel, the following vulnerability has been resolved: mm: mglru: fix stale batch updates after memcg reparenting The mglru page table walker batches per-generation size deltas in walk-nrpages while walking page tables without holding the lruvec lock. The resetbatchsize later folds...

CVE-2026-80719

CVE-2026-80719 affects the MGLRU (multi-gen LRU) memory management subsystem in the Linux kernel . A race condition exists between the mglru page table walker, which batches per-generation size deltas without holding the lruvec lock, and the memcg reparenting path. This can cause stale batch upda...

page-table-exploitation

page-table-exploitation Eine Demonstration, wie Seitentabellen verwendet werden können, um beliebigen Code in Ring-0 auszuführen und zu einer Privilegienerweiterung zu führen. Verwendet CVE-2016-7255 als Beispiel...

UBUNTU-CVE-2026-74674

In the Linux kernel, the following vulnerability has been resolved: mm: fix incorrect flush address in direct page table reclaim When zappterange reclaims a page table, it does: ptefreetlbtlb, pmdpgtablepmdval, addr; and this is unconditionally wrong: if this code executes, addr always points one...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098714)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098714 advisory. In the Linux kernel, the following vulnerability has been resolved: iommu/amd/pgtbl: Fix possible race while increase page table level The AMD IOMMU host page table...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-098856)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-098856 advisory. In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix hugepmdunshare vs GUP-fast race hugepmdunshare drops a reference on a page table...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: x86/mm/64: Defined ARCHPAGETABLESYNCMASK and archsynckernelmappings. These definitions ensure that page tables are properly synchronized when calling pdpopulatekernel. For 5-level paging, synchronization is performed via...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, Linux, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fixed the flushtlbrange function when it is used to erase normal PMD entries PMD entries that point to page tables, along with the PTE entries in the pointed-to page table. In the arm64 version of flushtlbrange, there is ...

Astra Linux – Vulnerability in Linux

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fixed the PTE update for kernel memory on radix. When adding a PTE, a ptesync is required to ensure that the PTE update is performed correctly. Otherwise, a spurious fault may occur. radixsetpteat does not perform th...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ARC: mm: fix leakage of memory allocated for PTE Since the commit d9820ff “ARC: mm: switch pgtablet back to struct page ”, a memory leakage problem occurred. Memory allocated for page table entries wasn’t released during process...

Astra Linux – Vulnerability found in Linux 5.15, Linux 6.1, and Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: independent PMD page table shared count The refcount may be unexpectedly increased through functions like trygetfolio, especially by calls such as splithugepages. In hugepmdunshare, we use the refcount to check wheth...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pv: fix index value of replaced ASCE The index field of the struct page corresponding to a guest ASCE should be 0. When replacing the ASCE in s390replaceasce, the index of the new ASCE should also be set to 0. Using th...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: mm: Avoid leaving partial pfn mappings in error cases. As Jann points out, PFN mappings are special. Unlike normal memory mappings, there is no lifetime information associated with the mapping—it’s just a raw mapping of PFNs,...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: RISCV: Kernel mappings of the EFI page table must be synchronized before switching to the EFI page table. The EFI page table is initially created as a copy of the kernel page table. When VMAPSTACK is enabled, kernel stacks are...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: powerpc/fixmap: Fixed the VM debug warning when unmapping a fixmap entry. The unmapping of a fixmap entry is performed by calling setfixmap, with FIXMAPPAGECLEAR as the flag. Currently, powerpc setfixmap calls mapkernelpage...

Astra Linux – Vulnerability in Linux 6.1

In the Linux kernel, the following vulnerability has been resolved: drm/i915/dpt: Makes the DPT object unshrinkable. In some scenarios, the DPT object is shrunk, but the actual framebuffer does not undergo any shrinkage. As a result, the DPT object remains in the DPT’s vm-boundlist. Then, an...