Lpe

Overview Attribute Value CVE CVE-2026-64564 Name SCTPhantom Type Use-After-Free (UAF) → Local Privilege Escalation + Container Escape CVSS 9.8 CRITICAL (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) Affected Linux kernel 2.6.25 → 7.1.x (introduced 2007, ~18 years) Fixed 6.6.148, 6.12.101, 6.18.42, 7.1.6, mainline 7.2-rc5 Researcher Tencent Zhuque Lab (via Corvus AI pipeline) PoC ✅ Public (reproducible exploit demonstrated) CISA KEV ❌ Not yet listed Patch ✅ Upstream (mainline commit 9b2854f86f0b) What Is SCTPhantom? SCTPhantom is a use-after-free in the Linux kernel’s SCTP (Stream Control Transmission Protocol) Dynamic Address Reconfiguration implementation. An attacker who can reach the SCTP stack can trigger a stale-pointer dereference that leads to full root on the host — and, critically, escape a container to compromise the underlying host. ...

Overview Attribute Value CVE ID CVE-2026-43121 Related CVE-2026-23263 (page array leak, same subsystem) CVSS Score ~7.8 (est., NVD enrichment pending) Vendor Linux Kernel Component io_uring/ZCRX (zero-copy receive) Vulnerability Type Missing bounds check → OOB heap write; Race condition → double-free Affected Linux kernel 6.12–6.19 (CONFIG_IO_URING_ZCRX=y) Patched ✅ Commit 770594e (bounds check) + 003049b1c4fb (atomic race fix), backported to v6.18.16 Exploit Status ⚠️ PoC demonstrated (kernel module + userspace harness) KEV Added Not yet What Is ZCRX? io_uring’s ZCRX (zero-copy receive) is a subsystem new to Linux 6.15 that lets userspace receive network packets directly into a registered memory region — no kernel copy needed. The NIC DMAs into the region, the kernel posts a completion event, and the user returns the slot when done via a refill queue. ...

Overview Attribute Value CVE (ESP variant) CVE-2026-43284 CVE (RxRPC variant) CVE-2026-43500 (reserved, no patch yet) Name Dirty Frag Type Local Privilege Escalation (LPE) Affected Ubuntu 24.04, RHEL 10.1, CentOS Stream 10, AlmaLinux 10, Fedora 44, openSUSE Tumbleweed — effectively all major distros Effective Lifetime ~9 years (xfrm-ESP since 2017, RxRPC since 2023) Race Condition None — deterministic Researcher Hyunwoo Kim (@v4bel) PoC ✅ Public (github.com/V4bel/dirtyfrag) ESP Patch ✅ Merged to mainline (f4c50a4034e6) RxRPC Patch ❌ No patch in any tree yet What Is Dirty Frag? Dirty Frag is a vulnerability class — not a single bug — that extends the same lineage as Dirty Pipe (CVE-2022-0847) and Copy Fail (CVE-2026-31431). Where Dirty Pipe overwrites struct pipe_buffer and Copy Fail overwrites the AF_ALG scatterlist, Dirty Frag overwrites the frag member of struct sk_buff. ...

Overview Attribute Value CVE ID CVE-2026-31431 Name Copy Fail CVSS Score ~8.4 (High) Type Local Privilege Escalation (LPE) Affected All major Linux distributions since 2017 Tested Ubuntu 24.04, Amazon Linux 2023, RHEL 14.3, SUSE 16 Kernels 6.12, 6.17, 6.18 (and all back to 2017) Exploit Size 732 bytes (Python script) Dependencies Python 3.10+ (for os.splice), standard library only Race Condition None — deterministic, straight-line exploit Stealth Page cache corrupted; on-disk file and checksums unchanged What Makes Copy Fail Different Linux kernel privilege escalation bugs are not new. But Copy Fail stands apart from its predecessors in four critical ways: ...

Overview Attribute Value CVE ID CVE-2026-33825 CVSS Score 7.8 Vendor Microsoft Product Windows Defender Antivirus (Windows 10/11, Server 2016+) Vulnerability Type TOCTOU + Path Confusion → Local Privilege Escalation Status ✅ Patched (April 14, 2026 Patch Tuesday) CWE CWE-367 (Time-of-check Time-of-use Race Condition) KEV Added Not yet Exploitation Status ⚠️ PoC public, no confirmed in-the-wild attacks yet Patch Status ❌ Unpatched (as of April 12, 2026) Affected Versions Version Status Windows 10 (1709+) ❌ Vulnerable Windows 11 ❌ Vulnerable Windows Server 2016+ ⚠️ Partial (elevated admin, not full SYSTEM) Windows 10 (pre-1709) ✅ Not affected (no Cloud Files API) Description BlueHammer is a local privilege escalation vulnerability in Microsoft Defender Antivirus that chains a TOCTOU race condition with path confusion in Defender’s signature update workflow. A standard user can exploit Defender’s own privileged update mechanism to leak the SAM hive, decrypt credentials, and achieve SYSTEM privileges. ...

It’s been nine days since Chaotic Eclipse published the BlueHammer exploit on GitHub. Here’s what’s changed — and what hasn’t. Current Status: Still Zero-Day Attribute Status CVE Assigned ❌ No Microsoft Patch ❌ None Official Mitigation ❌ None PoC Available ✅ Original + Reimplementation Actively Exploited ⚠️ No confirmed in-the-wild attacks (yet) Detection Coverage 8/72 vendors on VirusTotal Microsoft’s last public statement (April 7) reaffirmed commitment to coordinated disclosure without addressing the MSRC communication breakdown or providing a timeline. ...

Since my initial coverage of BlueHammer, the security community has produced excellent technical analysis. This post consolidates the deep-dive details you need to understand how this exploit actually works — and why it’s more sophisticated than most LPEs. The Big Picture BlueHammer isn’t your typical privilege escalation. It doesn’t exploit a single bug — it chains seven distinct stages, weaponizing Windows Defender’s own trusted update mechanism against the system. Key insight: The exploit abuses Defender’s signature update workflow to leak the SAM hive, decrypt credentials, and achieve SYSTEM — all from a standard user context. ...

Another day, another zero-day — but this one comes with a twist. A frustrated security researcher has gone full rogue and dropped working exploit code for an unpatched Windows local privilege escalation (LPE) vulnerability on GitHub. There is no patch. There are no workarounds. And the code works. Here’s the full breakdown. The Vulnerability: BlueHammer Researcher Alias: Chaotic Eclipse / Nightmare-Eclipse Disclosure Date: April 3, 2026 (exploit code published) Type: Local Privilege Escalation (LPE) ...