Vulnerability | Breaking Cybersecurity News | The Hacker News

This week was a reminder that attackers do not always need big tricks. One small mistake, one old access path, one missed patch, and suddenly the door is open. The noise is not all noise, either. Forums are talking, researchers are finding easy cracks, and defenders have more cleanup waiting. Here’s the full Monday recap. ⚡ Threat of the Week New DirtyClone Linux Kernel Flaw Lets Local Users Gain Root via Cloned Packets — Cybersecurity researchers detailed a new variant of the Dirty Frag Linux kernel flaw. Called DirtyClone (aka CVE-2026-43503), it allows local users to gain root privileges via cloned packets. The exploit works successfully on Debian, Ubuntu, and Fedora systems with default namespace configurations. "Any local user on a server or device running a vulnerable kernel who holds or can acquire the CAP_NET_ADMIN capability (frequently obtainable via unprivileged user namespaces) [is exploitable]," JFrog said. "This poses the highest risk to multi-te...

A public proof-of-concept is now out for CVE-2026-55200 , a critical flaw in libssh2 that lets a malicious or compromised SSH server trigger memory corruption on a connecting client, with possible code execution. No credentials, no user interaction. The bug affects every release up to and including 1.11.1 and carries a CVSS 4.0 score of 9.2 . libssh2 is a client-side SSH library, not a server. That distinction matters. It is embedded in curl, Git, PHP, backup agents, firmware updaters, and a long tail of appliances. Anything that links it and reaches out to an untrusted SSH endpoint is a potential target. Many of those copies are statically linked, so a distro package update will not touch them, and you may not know they are there. How the bug works The flaw lives in ssh2_transport_read() in transport.c, the function that parses incoming SSH packets during the handshake. It read the attacker-controlled packet_length field and rejected only values belo...

A newly discovered cyber attack campaign has been observed delivering a previously undocumented malware family called SharkLoader that acts as a loader for deploying Cobalt Strike Beacon on compromised hosts. Kaspersky, which is tracking the activity under the moniker StrikeShark , said the campaign has targeted a diplomatic organization in Indonesia, government organizations in Taiwan, software development companies across multiple countries, and entities associated with other sectors located in Hong Kong, Lebanon, Syria, Colombia, North Macedonia, Nepal, and Serbia.  "The observed victimology suggests a campaign with broad geographic reach and a diverse target set rather than a narrow focus on a specific industry or region," the Russian cybersecurity vendor said . The campaign does not exhibit direct links to any known threat actor or group, although the operators have utilized several open-source post-compromise tools like FScan and Pillager , which are commonly p...

A flaw in the Linux kernel's traffic-control subsystem can let a local unprivileged user gain root on affected systems. CVE-2026-46331 , nicknamed " pedit COW ," is an out-of-bounds write in the packet-editing action (act_pedit) that corrupts shared page-cache memory. A  public, working exploit  appeared within a day of the CVE assignment on June 16. Red Hat  rates the flaw as important . The exploit never touches the file on disk. It poisons the cached copy of a setuid root binary (/bin/su) in memory, injects a small payload, and runs that altered image as root. File-integrity checks come back clean while a root shell is already open. The exploit needs two things: act_pedit being loadable and unprivileged user namespaces being open, giving the attacker a namespace-local networking capability (CAP_NET_ADMIN) needed to trigger the bug. On the tested RHEL and Debian targets, both conditions were present. How the Bug Works Linux's tc traffic-...

A high-severity flaw in Amazon Q Developer let a malicious repository run commands and steal a developer's cloud credentials. The path was short: a developer opens the repo, trusts the workspace, and Amazon Q does the rest. Amazon has patched it. Tracked as  CVE-2026-12957  (CVSS 8.5), the bug sat in how Amazon's AI coding assistant handled Model Context Protocol (MCP) servers. Wiz Research, which found and reported it, showed that a single config file dropped in a repo was enough to go from git clone to cloud compromise. How the attack worked Amazon Q read an MCP configuration file, .amazonq/mcp.json, from the open workspace and launched the servers it defined. MCP servers are local processes that an AI assistant can spawn to reach databases, APIs, or build tools, so starting one means running commands on the machine. Those processes inherited the developer's full environment. That usually means AWS keys, cloud CLI tokens, API secrets, and SSH agent sockets. ...