Linux Kernel Security

Singularity: Deep Dive into a Modern Stealth Linux Kernel Rootkit

MatheuZSec published a detailed article about Singularity — a loadable kernel module rootkit developed for 6.x Linux kernels. The rootkit uses ftrace for hooking syscalls and hiding itself.

Extending Kernel Race Windows Using '/dev/shm'

Article by Faith about extending race condition windows via FALLOC_FL_PUNCH_HOLE. The technique allows delaying user memory accesses from the kernel mode, similar to userfaultfd and FUSE.

An RbTree Family Drama

Talk (slides) by William Liu and Savino Dicanosa about exploiting CVE-2025-38001 — a use-after-free in the network packet scheduler.

The exploit was also covered in a previously posted article.

Déjà Vu in Linux io_uring

Talk (slides) by Pumpkin about exploiting CVE-2025-21836 — a race condition that leads to a use-after-free in the io_uring subsystem.

CUDA de Grâce

Talk (slides) by Valentina Palmiotti and Samuel Lovejoy about exploiting a race condition that leads to a double-free in the NVIDIA GPU driver to escape a container created with NVIDIA Container Toolkit.

Race Condition Symphony: From Tiny Idea to Pwnie

Slides from a talk by Hyunwoo Kim and Wongi Lee about exploiting CVE-2024-50264 — a race condition in the vsock subsystem.

Previously, Alexander Popov described another way to exploit this vulnerability.

LinkPro: eBPF rootkit analysis

Théo Letailleur published an article with a detailed description of an eBPF rootkit that hides itself on the compromised system and activates its features upon receiving a "magic packet".

Slice: SAST + LLM Interprocedural Context Extractor

Amazing article by Caleb Gross about combining the use of CodeQL and LLMs to reliably rediscover CVE-2025-37899 — a remotely-triggerable vulnerability in the ksmbd module.

Enhancing FineIBT

LWN article that describes the talk by Scott Constable and Sebastian Österlund about the ongoing work to improve FineIBT (Fine-grain Control-flow Enforcement with Indirect Branch Tracking).

The article also refers to another post "A hole in FineIBT protection" about a method to bypass this CFI mechanism.

Cracking the Pixel 8: Exploiting the Undocumented DSP to Bypass MTE

Talk (slides) by Pan Zhenpeng and Jheng Bing Jhong about exploiting a logical bug in the Pixel GXP driver that allows overwriting read-only files.

Exploiting CVE-2025-21479 on a Samsung S23

Article by XploitBengineer about exploiting a logical bug in the Qualcomm Adreno GPU firmware to take over the kernel on Samsung S23 via a combination of page table attacks.

LPE via refcount imbalance in the af_unix of Ubuntu

Article and exploit by kylebot for a refcount imbalance bug in the Ubuntu kernel's Unix sockets implementation disclosed during the TyphoonPWN 2025 competition.

kernelCTF: CVE-2025-38477

kernelCTF entry for a race condition in the network scheduler subsystem.

Most notably, shows a technique of putting controlled data into unmapped sections of vmlinux.

Defeating KASLR by Doing Nothing at All

Article by Seth Jenkins about a few problems with physical memory KASLR on arm64 devices.

Oops! It's a kernel stack use-after-free: Exploiting NVIDIA's GPU Linux drivers

Article by Robin Bastide about exploiting a NULL-pointer-dereference that led to a UAF access to the kernel stack in the NVIDIA GPU driver.

The article shows an interesting scenario of how a NULL-pointer-dereference can lead to a more severe memory corruption. It also demonstrates a few techniques of shaping vmalloc memory for exploitation.

ksmbd - Exploiting CVE-2025-37947

Article by Norbert Szetei about locally exploiting CVE-2025-37947 — a page OOB write in the ksmbd module.

Dirty Pageflags: Revisiting PTE Exploitation in Linux

Article by ptr-yudai on the exploitation technique of overwriting the R/W flag in a PTE entry to allow writing into read-only files.

Eternal-Tux: Crafting a Linux Kernel KSMBD 0-Click RCE Exploit from N-Days

William Liu posted an article about exploiting a slab object overflow (CVE-2023-52440) and remote infoleak (CVE-2023-4130) in the kernel SMB3 daemon to gain RCE.

The anatomy of a bug: 6 Months at STAR Labs

Gerrard Tai posted an article describing their experience in finding kernel bugs and participating in the KernelCTF and Pwn2Own competitions.

A Syzkaller Summer: Fixing False Positive Soft Lockups in net/sched Fuzzing

Article by Will's Root about fixing the soft lockup bug found when fuzzing the network scheduler subsystem with syzkaller.

The article also gives a summary about the exploitable bugs the author managed to find in the same subsystem.