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。...

Astra Linux – Vulnerability in Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: Fixed the use of VAS memory after freeing it. The reference count on the memory module is dropped before the coprocessor is detached...

CVE-2026-57843

NetBSD contains an information disclosure vulnerability in mmopen within sys/dev/mm.c that allows unprivileged local users to obtain real kernel virtual addresses by opening world-accessible devices such as /dev/null or /dev/zero, which incorrectly receive the PKKMEM process flag. Attackers can...

CVE-2026-57843

CVE-2026-57843 is an information disclosure vulnerability in NetBSD affecting the mm_open() function in sys/dev/mm.c. The root cause is that world-accessible devices such as /dev/null and /dev/zero are incorrectly assigned the PK_KMEM process flag. This allows unprivileged local users to bypass t...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerabilities have been resolved: PowerPC: Fixed virtaddrvalid for 64-bit Book3E & 32-bit systems. MPE: On 64-bit Book3E, the vmalloc space starts at 0x8000000000000000. Due to the way pa works, pa0x8000000000000000 returns 0. Consequently,...

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: drm/radeon: Check that bova-bo is not NULL before using it. The call to radeonvmclearfreed may clear bova-bo, so we must check this before dereferencing it...

Astra Linux – Vulnerability found in Linux 6.1, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: ACPI: PRM: Find the EFIMEMORYRUNTIME block for the PRM handler and context PRMT needs to find the correct type of block to translate the PA-VA mapping for EFI runtime services. The issue arises because PRMT is looking for a block...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: validate the virtual address and size of the userq buffer. It is necessary to validate the virtual address of the userq object to determine whether it is located in a valid vm mapping...

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

In the Linux kernel, the following vulnerabilities have been resolved: amdgpu: validated offsetinbo of drmamdgpugemva This issue arises due to OOB access in amdgpuvmupdaterange when offsetinbo + mapsize causes an overflow. v2: retained the validations for amdgpuvmbomap v3: added the validations t...

CVE-2026-74403

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Check for page allocation failure correctly in TIO Sashiko notes: if snpallocfirmwarepages returns NULL under memory pressure, is it safe to pass it directly to pageaddress? On architectures without HASHEDPAGEVIRTUA...

PT-2026-72839

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Check for page allocation failure correctly in TIO Sashiko notes: if snp alloc firmware pages returns NULL under memory pressure, is it safe to pass it directly to page address? On architectures without HASHED PAGE...

CVE-2026-34196

Software installed and run as a non-privileged user may conduct improper GPU system calls to cause an integer overflow and map two GPU virtual addresses to the same physical address. One of these virutal mappings can be freed along with the physical page, allowing for a read/write UAF via the...

CVE-2026-53140

A flaw was found in the Linux kernel's drm/v3d driver. This vulnerability occurs because a specific function, v3drewritecsdjobwgcountsfromindirect, does not correctly release virtual address mappings under certain conditions, specifically when workgroup counts are zero. This oversight results in ...

CVE-2026-53140

In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Fix vaddr leak when indirect CSD has zeroed workgroups v3drewritecsdjobwgcountsfromindirect maps both the indirect buffer and the workgroup buffer and is expected to release them before returning. When any of the workgro...

CVE-2026-53140 drm/v3d: Fix vaddr leak when indirect CSD has zeroed workgroups

In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Fix vaddr leak when indirect CSD has zeroed workgroups v3drewritecsdjobwgcountsfromindirect maps both the indirect buffer and the workgroup buffer and is expected to release them before returning. When any of the workgro...

CVE-2026-52971

In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Fix potential use-after-free in gettimestamp Move the phc-active check and resp pointer assignment to after acquiring the spinlock. Previously, phc-active was checked without holding the lock, and resp was cached...

CVE-2026-52971

In the Linux kernel, the following vulnerability has been resolved: net: ena: PHC: Fix potential use-after-free in gettimestamp Move the phc-active check and resp pointer assignment to after acquiring the spinlock. Previously, phc-active was checked without holding the lock, and resp was cached...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerabilities have been resolved: mm/vmalloc: The vmappurgelock must be taken in the shrinker function. The decayvapoolnode function can be invoked concurrently from two paths: 1. purgevmaparealazy, when pools are being purged; 2. The shrinker via...

CVE-2026-46325

Summary (details from sources): CVE-2026-46325 affects the Linux kernel RDMA/rxe code, where iova-to-va conversion fails when MR page_size differs from system PAGE_SIZE. The bug arises because rxe_set_page() uses mr->page_size steps while the page_list holds PAGE_SIZE pages, and ib_sg_to_page(...

CVE-2026-46325

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix iova-to-va conversion for MR page sizes != PAGESIZE The current implementation incorrectly handles memory regions MRs with page sizes different from the system PAGESIZE. The core issue is that rxesetpage is called...