CVE-2023-2598

CVE-2023-2598 권한 상승 CVE-2023-2598을 통해 리눅스의 Compound Page와 folio 메커니즘을 이해하고, 이후 1day 취약점 CVE-2023-6560를 이용할 수 있는지 확인해본다. Compound Pagehuge page 메모리는 점점 커지지만 리눅스의 기본 페이지 할당 단위는 여전히 4KB로 부족해지면서, 복합 페이지compound page가 도입되었다. 복합 페이지는 여러 페이지를 하나의 집합으로 취급하여, 두 개 이상의 물리적으로 연속된 페이지를 하나의 단위로 결합한 것이다. 여러 측면에...

HugeDirtyCowPOC

"Huge Dirty Cow" POC Huge Dirty Cow 취약점CVE-2017-1000405에 대한 POC입니다. 자세한 내용은 여기에서 확인할 수 있습니다. 실행 전에 transparent huge pages를 "always"로 설정해야 합니다: root@kitploit: echo always | sudo tee /sys/kernel/mm/transparenthugepage/enabled...

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...

kernel: mm/khugepaged: write all dirty file folios when collapsing

A flaw was found in the Linux kernel's memory management mm/khugepaged component. A local user could trigger an edge case where unsaved changes to file data dirty folios are improperly discarded. This occurs when a file with previous writes is subjected to a specific sequence of memory advice...

Astra Linux – Vulnerabilities in Linux 5.10, Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: mm,hugetlb: Take the hugetlblock before decrementing h-resvhugepages. The h-hugepages counters are protected by the hugetlblock, but allochugepage has a corner-case scenario where it can decrement the counter outside of the lock...

Astra Linux – Vulnerability in Linux 5.10

In the Linux kernel, the following vulnerability has been resolved: mm: khugepaged: skip huge page collapse for special files The read-only THP for file systems will collapse the THP for files that are opened in read-only mode and mapped with VMEXEC. The intended use case is to avoid TLB misses f...

kernel: mm/huge_memory: update file PMD counter before folio_put()

A flaw was found in the Linux kernel's memory management, specifically within the huge page mechanism. When a huge page is split, the system updates a counter after releasing a reference to the memory. This timing issue can lead to the system attempting to read from memory that has already been...

Linux Distros Unpatched Vulnerability : CVE-2026-72175

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - fs/proc/taskmmu: fix makeuffdwphugepte prot-update race Patch series userfaultfd/pagemap: pre- existing fixes. These are pre-existing bug fixes that were carrie...

kernel: mm: thp: deny THP for files on anonymous inodes

A flaw was found in the Linux kernel's Transparent Huge Pages THP mechanism. This vulnerability occurs because the filethpenabled function incorrectly allows THP for files on anonymous inodes, which are not designed for this feature. An attacker could potentially exploit this by manipulating...

UBUNTU-CVE-2026-72175

In the Linux kernel, the following vulnerability has been resolved: fs/proc/taskmmu: fix makeuffdwphugepte prot-update race Patch series "userfaultfd/pagemap: pre-existing fixes". These are pre-existing bug fixes that were carried at the front of the userfaultfd RWP working-set-tracking series up...

CVE-2026-72043

This CVE describes a LoongArch Linux kernel issue where hardware page table walker (PTW) could set only _PAGE_DIRTY in PTE/PMD during a write TLB miss, leaving _PAGE_MODIFIED unchanged. On fork/clone with COW, pte_wrprotect()/pmd_wrprotect() clear _PAGE_WRITE and _PAGE_DIRTY, which could lose the...

CVE-2026-68086

A flaw was found in the Linux kernel's memory management mm/khugepaged component. A local user could trigger an edge case where unsaved changes to file data dirty folios are improperly discarded. This occurs when a file with previous writes is subjected to a specific sequence of memory advice...

EUVD-2026-55552

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: prevent registration of special VMAs Vova Tokarev says: userfaultfd allows registration on shadow stack VMAs. With userfaultfd access, you can register on the shadow stack, discard a page ... and inject a page with...

CVE-2026-68166

The CVE-2026-68166 issue in the Linux kernel is addressed by restricting userfaultfd registrations. The fix updates vma_can_userfault() to reject VM_SHADOW_STACK and VM_SPECIAL so that drivers implementing vm_uffd_ops cannot register special VMAs with userfaultfd. VM_SPECIAL’s inclusion of VM_DON...

CVE-2026-68166 userfaultfd: prevent registration of special VMAs

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: prevent registration of special VMAs Vova Tokarev says: userfaultfd allows registration on shadow stack VMAs. With userfaultfd access, you can register on the shadow stack, discard a page ... and inject a page with...

Linux Distros Unpatched Vulnerability : CVE-2026-68086

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - mm/khugepaged: write all dirty file folios when collapsing There is no upstream commit, as this code was removed by upstream commit 044925f9b565 mm: fs: remove...

CVE-2026-64181

A flaw was found in the Linux kernel's memory management subsystem. On 32-bit x86 systems with Transparent Huge Pages THP enabled, a missing feature for handling special page table entries can lead to incorrect tracking of memory resources. This can result in system warnings, errors related to...

EUVD-2026-45866

In the Linux kernel, the following vulnerability has been resolved: mm: fix vmnormalpage to handle missing support for pmdspecial/pudspecial On x86 32-bit with THP enabled, zaphugepmd is seen to generate a "WARNING: mm/memory.c:735 at vmnormalpage+0x6a/0x7d", from the VMWARNONONCEiszeropfnpfn ||...

CVE-2026-64181

In the Linux kernel, the following vulnerability has been resolved: mm: fix vmnormalpage to handle missing support for pmdspecial/pudspecial On x86 32-bit with THP enabled, zaphugepmd is seen to generate a "WARNING: mm/memory.c:735 at vmnormalpage+0x6a/0x7d", from the VMWARNONONCEiszeropfnpfn ||...

CVE-2026-64181 mm: fix __vm_normal_page() to handle missing support for pmd_special()/pud_special()

In the Linux kernel, the following vulnerability has been resolved: mm: fix vmnormalpage to handle missing support for pmdspecial/pudspecial On x86 32-bit with THP enabled, zaphugepmd is seen to generate a "WARNING: mm/memory.c:735 at vmnormalpage+0x6a/0x7d", from the VMWARNONONCEiszeropfnpfn ||...