page_table_walk

物理メモリ上のフラグキャプチャ あなたはページングについて読んだことがあります。図表は理解できる。4レベル、各9ビット、ページフレーム、オフセット。確かに。しかし、実際にページテーブルをウォークする必要があるチャレンジに直面すると、自分はそれを知っているわけではないことに気づきます。について知っているだけです。大きな違いです。 私にとって効果的だったのは、QEMUとgdbの前に座り、自分でウォークを行うことでした。すべてのインデックスを計算し、物理メモリからすべてのエントリを読み取り、すべてのポインタを手動で追跡します。そのような半日の作業は、何時間もの講義よりも多くのことを教えてくれま...

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...

Astra Linux – Vulnerability found in Linux 5.10, Linux 5.15

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 – 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: s390/uv: Do not call foliowaitwriteback without a folio reference. foliowaitwriteback requires that no spinlocks are held and that a folio reference is held, as documented. After we removed the PTL, the folio object could be free...

CVE-2026-89617

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate dirty page table on log replay Each DIRPAGEENTRY ends in a pagelcns array whose length is the on-disk lcnsfollow field. checkrstbl validates the table bookkeeping but never checks that this array fits in the...

page-table-exploitation

page-table-exploitation 演示如何利用页表在 ring-0 中运行任意代码并导致权限提升。以 CVE-2016-7255 为例。...

CVE-2026-89617

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate dirty page table on log replay Each DIRPAGEENTRY ends in a pagelcns array whose length is the on-disk lcnsfollow field. checkrstbl validates the table bookkeeping but never checks that this array fits in the...

UBUNTU-CVE-2026-89617

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate dirty page table on log replay Each DIRPAGEENTRY ends in a pagelcns array whose length is the on-disk lcnsfollow field. checkrstbl validates the table bookkeeping but never checks that this array fits in the...

CVE-2026-89617

A vulnerability in the Linux kernel NTFS3 filesystem driver (fs/ntfs3) allows a local attacker to craft a malicious NTFS log file where a tampered lcns_follow field in a DIR_PAGE_ENTRY causes an out-of-bounds write during log replay. The root cause is that check_rstbl() validates table bookkeepin...

CVE-2026-89617 fs/ntfs3: validate dirty page table on log replay

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate dirty page table on log replay Each DIRPAGEENTRY ends in a pagelcns array whose length is the on-disk lcnsfollow field. checkrstbl validates the table bookkeeping but never checks that this array fits in the...

kernel: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation

A flaw was found in the Kernel-based Virtual Machine KVM component of the Linux kernel on arm64 architectures. This vulnerability occurs because certain page table walk operations, used in fault injection and Address Translation AT emulation, do not properly acquire a Sleepable Read-Copy Update...

Unity Linux 20.1050a Security Update: kernel (UTSA-2026-053290)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-053290 advisory. In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pticlonepgtable alignment assumption Guenter reported dodgy crashes on an i386-nosmp...

CVE-2026-80894

In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix wrong hwpt passed to iommufdautoresponsefaults on replace iommufdhwptreplacedevice calls: iommufdautoresponsefaultshwpt, oldhandle; passing the new hwpt together with the handle of the device's old domain. This shoul...

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...

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...

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...

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...