page_table_walk

物理内存中的夺旗挑战 你已经读过关于分页的内容。图表看起来也合理。四级页表，每级9位，页框，偏移量。没错。但当你遇到一个真正需要手动遍历页表的挑战时，你意识到你并不真正理解它。你只是知道它。区别很大。 对我来说有效的方法是坐在QEMU和gdb前，亲自手动完成遍历：计算每个索引，从物理内存中读取每个条目，手动跟踪每个指针。一个下午的实践比几个小时的讲座学到更多。 这是我当时记录的笔记集合。如果你仍然缺少概念方面的理解，先看Zardus的关于内核内存管理的讲座。那是理论。这是实践。...

page-table-exploitation

page-table-exploitation Una demostración de cómo se pueden usar las tablas de páginas para ejecutar código arbitrario en ring-0 y provocar una escalada de privilegios. Usa CVE-2016-7255 como ejemplo...

Linux Distros Unpatched Vulnerability : CVE-2026-90383

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference ...

CVE-2026-90383

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user...

DEBIAN-CVE-2026-90383

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user...

AZL-102504 CVE-2026-90383 affecting package kernel 6.6.150.1-1

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user...

EUVD-2026-82044

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user...

CVE-2026-90383 misc: sgi-gru: remove interrupt-context page-table walks

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user...

CVE-2026-90383

CVE-2026-90383 affects the Linux kernel's SGI GRU (General Register Unit) driver. The GRU TLB miss handler walks a process's page tables in interrupt context without holding page-table locks or a reference to the mapped page, and uses a kernel page-table accessor on user page tables, supporting o...

KVM-Januscape

KVM-XJ 热补丁 dumptool.py 是自动寻找偏移，怎么用就自己看代码 漏洞概述 CVE-2026-53359（Januscape）是 Linux 内核 KVM 影子 MMU 中的释放后使用（UAF）漏洞。 潜伏时间：16 年（2010年8月至2026年7月） 影响范围：所有启用嵌套虚拟化的 Intel/AMD x86 系统 危害等级：高危，VM 内 root 用户可逃逸到母鸡，获取母鸡 root 权限 利用方式：母鸡内核 panic（DoS）或完整虚拟机逃逸（无公开POC） 漏洞原理 kvmmmugetpage 函数在哈希表中查找可复用的影子页表时，仅比较了...

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 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 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 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 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 – Vulnerabilities in Linux 5.10, Linux 5.15, Linux 6.1

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 – 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 found in 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 found in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fixed an out-of-bounds shift in CalculateVMAndRowBytes. REASON When PTEBufferSizeInRequests is zero, UBSAN reports the following warning because dmllog2 returns an unexpected negative value: The shift exponent...