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New Zapscape KVM Flaw Could Let Privileged L1 Guest Code Escape to Linux Hosts

New Zapscape KVM Flaw Could Let Privileged L1 Guest Code Escape to Linux Hosts

Zapscape , a new Linux kernel vulnerability, could allow an attacker with kernel privileges inside an L1 guest virtual machine (VM) to escape KVM isolation and execute code on the host. The risk applies when nested virtualization is exposed to untrusted guests. The flaw is tracked as  CVE-2026-64561  and affects KVM/x86's shadow memory management unit (MMU), which manages shadow page tables used for nested guest memory translation. Security researcher Hyunwoo Kim, who disclosed the bug, said the demonstrated exploit path can run commands on the host with kernel, or root, privileges. The upstream fix has been merged, and administrators running KVM hosts that expose nested virtualization to untrusted guests should update to a fixed stable kernel or a vendor package that backports the patch. The required L1 kernel privilege usually means guest root. Intel systems also require both EPT page-walk length 4 and 5 to be exposed to the L1 guest. AMD has no equivalent conditio...

î ‚Aug 06, 2026
2
AI Threat Readiness 101

AI Threat Readiness 101

Learn the four pillars of AI threat readiness and how security teams can reduce risk faster with detection, validation, and remediation built for today's threat landscape.

3
Cisco Patches 12 SD-WAN and IOS XE Flaws, Including Three 9.8 CVSS Score Bugs

Cisco Patches 12 SD-WAN and IOS XE Flaws, Including Three 9.8 CVSS Score Bugs

Cisco has rolled out updates to address multiple critical security vulnerabilities impacting Catalyst SD-WAN and IOS XE Software as part of a comprehensive internal security review. The security issues affect Cisco Catalyst SD-WAN Software, regardless of device configuration, and Cisco IOS XE Software when it is running in autonomous or controller mode. "These vulnerabilities were found during internal security testing using existing testing processes as well as frontier AI models [...] and are not known to be actively exploited," Cisco said, urging customers to apply the necessary updates for optimal protection. The vulnerabilities impacting Catalyst SD-WAN Software are listed below - CVE-2026-20303 (CVSS score: 9.9) - An improper input validation vulnerability (which also covers path traversals) CVE-2026-20304 (CVSS score: 9.9) - An improper access control vulnerability  CVE-2026-20310 (CVSS score: 9.9) - An improper link resolution before file acc...

î ‚Aug 06, 2026
4
New Interrupt Injection Attack Can Bypass Spectre v2 Defenses on Intel and AMD CPUs

New Interrupt Injection Attack Can Bypass Spectre v2 Defenses on Intel and AMD CPUs

An unprivileged Linux program can time a hardware interrupt to land in the gap between a processor sanitizing its branch predictor and the kernel using it, re-poisoning the predictor after the defense has run. MIT CSAIL researchers Daniël Trujillo and Mengjia Yan named the technique INTERRUPT INJECTION . On an AMD Zen 2 machine running Linux 6.14 with every default Spectre v2 mitigation on, their exploit leaked arbitrary kernel memory at 5.47 bytes per second with 91.97% accuracy, enough to locate and read /etc/shadow, which stores the system's password hashes, in five of ten attempts. It needs no privileges, only local code execution, so the risk sits on shared systems running an affected processor. The pair disclosed to AMD and Intel on February 5. AMD told them it plans a kernel patch; MIT says one has since shipped and arrives in a normal operating system update. A fix is in the Linux kernel. The commit, "x86/bugs: Make Safe-RET robust against interrupt injec...

î ‚Aug 06, 2026
5
ThreatsDay: Odysseus RCE, Samsung One-Click Takeover, iCloud Backdoor Fight + 27 More Stories

ThreatsDay: Odysseus RCE, Samsung One-Click Takeover, iCloud Backdoor Fight + 27 More Stories

Apparently, opening the thing is now enough. A repo can run before the first prompt, a package can hide among hundreds, and a harmless-looking PDF can finish the job. This week runs on cheap leverage: exposed servers, recycled bugs, poisoned agent instructions, remote-access tools dressed as support software, and trusted defaults doing attackers a favor. Nothing here is especially mystical. Just ordinary systems trusting slightly too much, slightly too early. The full list follows. The threats change every week. Subscribe, and we’ll alert you when each new ThreatsDay Bulletin is out.

î ‚Aug 06, 2026
6
Over 4,400 Rockwell PLCs Exposed Online, 22 Found in Water Attack Cities

Over 4,400 Rockwell PLCs Exposed Online, 22 Found in Water Attack Cities

Forescout found 22 internet-facing Rockwell Automation programmable logic controllers (PLCs) in cities hit by recent cyberattacks on US water utilities. Nineteen used the same mobile carrier network. Its August 3 scan counted 4,407 exposed Rockwell controllers worldwide, including 2,844 in the United States, but Forescout could not confirm any were compromised. That figure counts exposed controllers, not water utilities or confirmed victims. Forescout said the publicly described effects could be achieved without a vulnerability exploit: attackers changed IP addresses and set passwords on controllers that were already reachable, causing operators to lose visibility and, in some cases, control of connected equipment. Neither the government alerts nor Forescout's analysis explains how the attackers found, selected, or initially accessed their targets. Water and wastewater utilities in at least seven states have reported incidents since July 27 , the FBI and EPA said in a July...

î ‚Aug 06, 2026
8
CryptoJS Weak RNG Behind $5.7 Million in Drains Affects Five Crypto Wallet Apps

CryptoJS Weak RNG Behind $5.7 Million in Drains Affects Five Crypto Wallet Apps

Coinspect has identified CryptoJS.lib.WordArray.random() as the weak random number generator behind the Ill Bloom wallet drains . Introduced in the JavaScript cryptography library 12 years ago, the function supplied weak entropy that affected wallet apps used to generate recovery phrases. Coinspect's on-chain analysis puts the measured theft across two sweeps since late May at a lower bound of roughly $5.7 million. The blockchain security firm, which coined the Ill Bloom name in July, has now confirmed five applications that used the generator as an entropy source for recovery-phrase generation: RRWallet , which Coinspect says is discontinued. No fix. Bexo Wallet , which Coinspect says has been fixed in version 20.1.0, although the updated builds had not yet been uploaded. NanChat , which independently confirmed versions before 1.3.0 were affected. Fixed in 1.3.0. Bitcoin Libre , which Coinspect says fixed the issue in version 4, released July 2024. Milo , w...

î ‚Aug 06, 2026
9
Apple iCloud Private Relay Can Expose Real IPs Through WebKit Proxy Bypasses

Apple iCloud Private Relay Can Expose Real IPs Through WebKit Proxy Bypasses

Cybersecurity researchers have disclosed a security issue with Apple's iCloud Private Relay tool that can expose a user's real IP address. Introduced with iOS 15, iCloud Private Relay employs a dual-hop architecture to ensure users' privacy by routing their Safari web traffic through two relays so that no single third-party, including Apple, can determine where the request is originating from and what sites are being visited. It's available as part of the iCloud+ subscription. Researchers Talal Haj Bakry and Tommy Mysk, who found the issue, said the problem is rooted in three features in Apple's WebKit: DNS prefetching, WebAuthn Related Origin Requests, and WebTransport. WebKit is the default web browser engine used by Safari and all third-party browsers on iOS and iPadOS, such as Google Chrome, Microsoft Edge, Mozilla Firefox, Brave, and others. The three features "bypass the configured proxy and send traffic directly from the device, which exposes t...

î ‚Aug 06, 2026
10
AI Recommendation Poisoning: How

AI Recommendation Poisoning: How "Ask AI" Buttons Silently Alter LLM Memory

A new class of prompt injection is spreading across commercial websites. It requires no malware, no stolen credentials, and no zero-day exploit. It abuses a standard feature built into almost every major AI assistant: pre-filled deep links. We observed production websites embedding hidden prompt injection payloads inside "Ask AI" buttons on marketing and competitor comparison pages. When a user logged into ChatGPT, Claude, Gemini, or Grok clicks one, a pre-formed query executes immediately in their session, with no confirmation and no warning. Most of these links are benign. The dangerous ones instruct the AI to permanently save the vendor's domain as a "trusted source," quietly biasing every future answer in that vendor's favor. In February 2026, Microsoft Security catalogued the behavior as AI Recommendation Poisoning , identifying 31 companies across 14 industries deploying it, with more than 50 distinct prompts observed in a single data source over ...

î ‚Aug 06, 2026