DirtyClone & pedit COW Explained: Linux Privilege Escalation Deep Dive

Two newly disclosed Linux kernel vulnerabilities demonstrate that Copy-on-Write (COW) race conditions continue to be one of the most dangerous classes of privilege escalation bugs. In this technical deep dive, we analyze DirtyClone (CVE-2026-43503) and pedit COW (CVE-2026-46331), two high-severity local privilege escalation vulnerabilities that allow low-privileged users to obtain root access by exploiting race conditions inside the Linux kernel. This walkthrough covers both vulnerabilities from an exploitation and defensive perspective, explaining not only what went wrong, but why these bugs exist and how the upstream patches eliminate the race conditions. Topics covered: DirtyClone architecture and attack flow Why Copy-on-Write race conditions remain dangerous The Linux clone() and copy_mm() execution path How madvise(MADV_DONTNEED) creates exploitable race windows Arbitrary writes to read-only file-backed mappings Root privilege escalation techniques pedit COW internals inside the Linux Traffic Control subsystem skb_ensure_writable() race conditions Kernel heap corruption and use-after-free primitives Copy-on-Write failures inside packet processing Public Proof-of-Concept analysis Patch diff walkthroughs Detection opportunities Kernel hardening recommendations Mitigation strategies for Linux administrators You'll also learn how the Linux kernel fixed these issues by introducing stronger synchronization around page ownership and packet buffer handling, eliminating the race windows attackers relied upon. Whether you're preparing for OSCP, OSEE, OSED, CRTO, researching Linux internals, or working in vulnerability research and exploit development, this walkthrough explains the technical concepts behind these vulnerabilities in a practical and accessible way. Reference material: DirtyClone (CVE-2026-43503) pedit COW (CVE-2026-46331) Interactive research notes, code walkthroughs, attack diagrams, PoCs, and patch analysis *** Wiki https://wiki.motasem-notes.net/ Store https://buymeacoffee.com/notescatalog... Instagram   / motasem.hamdan.tech   TikTok   / motasemhamdan0   Patreon   / motasemhamdan   Instagram   / motasem.hamdan.tech   Google Profile https://maps.app.goo.gl/eLotQQb7Dm6ai... LinkedIn [1]:   / motasem-hamdan-7673289b   [2]:   / motasem-eldad-ha-bb42481b2   Twitter   / manmotasem   Facebook   / motasemhamdantty