USN-8183-1: Linux kernel (GCP) vulnerabilities

Josh Eads, Kristoffer Janke, Eduardo Vela Nava, Tavis Ormandy, and Matteo
Rizzo discovered that some AMD Zen processors did not properly verify the
signature of CPU microcode. This flaw is known as EntrySign. A privileged
attacker could possibly use this issue to cause load malicious CPU
microcode causing loss of integrity and confidentiality.
(CVE-2024-36347)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- MIPS architecture;
- PowerPC architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI drivers;
- Ublk userspace block driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- GPU drivers;
- Hardware monitoring drivers;
- Intel Trace Hub HW tracing drivers;
- InfiniBand drivers;
- Input Device core drivers;
- Input Device (Mouse) drivers;
- IOMMU subsystem;
- Multiple devices driver;
- Media drivers;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- Ethernet team driver;
- PA-RISC drivers;
- Chrome hardware platform drivers;
- x86 platform drivers;
- SCSI subsystem;
- SPI subsystem;
- TCM subsystem;
- Freescale USB OTG Transceiver Driver;
- USB Type-C Connector System Software Interface driver;
- Watchdog drivers;
- BTRFS file system;
- exFAT file system;
- Ext4 file system;
- F2FS file system;
- FUSE (File system in Userspace);
- HFS+ file system;
- File systems infrastructure;
- Network file system (NFS) server daemon;
- File system notification infrastructure;
- NTFS3 file system;
- OCFS2 file system;
- SMB network file system;
- XFS file system;
- User-space API (UAPI);
- io_uring subsystem;
- Scheduler infrastructure;
- Shadow Call Stack mechanism;
- Tracing infrastructure;
- Memory management;
- BPF subsystem;
- CAIF protocol;
- Ceph Core library;
- Networking core;
- Ethtool driver;
- Handshake API;
- HSR network protocol;
- IPv4 networking;
- IPv6 networking;
- Multipath TCP;
- Netfilter;
- NET/ROM layer;
- NFC subsystem;
- Open vSwitch;
- Rose network layer;
- Network traffic control;
- Sun RPC protocol;
- Key management;
- Landlock security;
- STMicroelectronics SoC drivers;
- USB sound devices;
- KVM subsystem;
(CVE-2025-68351, CVE-2025-68353, CVE-2025-68365, CVE-2025-68368,
CVE-2025-68725, CVE-2025-68736, CVE-2025-68745, CVE-2025-68767,
CVE-2025-68768, CVE-2025-68769, CVE-2025-68770, CVE-2025-68771,
CVE-2025-68772, CVE-2025-68773, CVE-2025-68774, CVE-2025-68775,
CVE-2025-68776, CVE-2025-68777, CVE-2025-68778, CVE-2025-68780,
CVE-2025-68781, CVE-2025-68782, CVE-2025-68783, CVE-2025-68784,
CVE-2025-68785, CVE-2025-68786, CVE-2025-68787, CVE-2025-68788,
CVE-2025-68791, CVE-2025-68792, CVE-2025-68793, CVE-2025-68794,
CVE-2025-68795, CVE-2025-68796, CVE-2025-68797, CVE-2025-68798,
CVE-2025-68799, CVE-2025-68800, CVE-2025-68801, CVE-2025-68802,
CVE-2025-68803, CVE-2025-68804, CVE-2025-68805, CVE-2025-68806,
CVE-2025-68807, CVE-2025-68808, CVE-2025-68809, CVE-2025-68810,
CVE-2025-68811, CVE-2025-68813, CVE-2025-68814, CVE-2025-68815,
CVE-2025-68816, CVE-2025-68817, CVE-2025-68818, CVE-2025-68819,
CVE-2025-68820, CVE-2025-68821, CVE-2025-68822, CVE-2025-68823,
CVE-2025-71064, CVE-2025-71065, CVE-2025-71066, CVE-2025-71067,
CVE-2025-71068, CVE-2025-71069, CVE-2025-71070, CVE-2025-71071,
CVE-2025-71072, CVE-2025-71073, CVE-2025-71075, CVE-2025-71076,
CVE-2025-71077, CVE-2025-71078, CVE-2025-71079, CVE-2025-71081,
CVE-2025-71082, CVE-2025-71083, CVE-2025-71084, CVE-2025-71085,
CVE-2025-71086, CVE-2025-71087, CVE-2025-71089, CVE-2025-71091,
CVE-2025-71093, CVE-2025-71094, CVE-2025-71095, CVE-2025-71096,
CVE-2025-71097, CVE-2025-71098, CVE-2025-71099, CVE-2025-71100,
CVE-2025-71101, CVE-2025-71102, CVE-2025-71104, CVE-2025-71105,
CVE-2025-71107, CVE-2025-71108, CVE-2025-71109, CVE-2025-71111,
CVE-2025-71112, CVE-2025-71113, CVE-2025-71114, CVE-2025-71115,
CVE-2025-71116, CVE-2025-71117, CVE-2025-71118, CVE-2025-71119,
CVE-2025-71120, CVE-2025-71121, CVE-2025-71122, CVE-2025-71123,
CVE-2025-71124, CVE-2025-71125, CVE-2025-71126, CVE-2025-71130,
CVE-2025-71131, CVE-2025-71132, CVE-2025-71133, CVE-2025-71135,
CVE-2025-71136, CVE-2025-71137, CVE-2025-71138, CVE-2025-71140,
CVE-2025-71143, CVE-2025-71146, CVE-2025-71147, CVE-2025-71148,
CVE-2025-71149, CVE-2025-71150, CVE-2025-71151, CVE-2025-71153,
CVE-2025-71154, CVE-2025-71156, CVE-2025-71157, CVE-2026-23091,
CVE-2026-23209)

nmap -sV --script vuln -p- <target-network>

tail -f /var/log/suricata/fast.log | grep <cve>

Check Vendor Security Advisory Bulletin

title: Detect Exploitation - USN-8183-1: Linux kernel (GCP) vulnerabilities
id: 25f20d82-2322-404f-9ccf-8ee3669d204c
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'CVE-2025-71149'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access
  - cve.2025-71149

rule CTI_CVE_2025_71149 {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for CVE-2025-71149"
    strings:
        $cve = "CVE-2025-71149" ascii wide
    condition:
        any of them
}

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("CVE-2025-71149" OR CommandLine="*CVE-2025-71149*")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

vulnerability.id: "CVE-2025-71149" or message: "*CVE-2025-71149*"

CommonSecurityLog
| where AdditionalExtensions has "CVE-2025-71149" or Message has "CVE-2025-71149"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

#!/usr/bin/env bash
# ==============================================================================
# iShareStuff CTI Fleet Remediation Automation
# Advisory Reference : CVE-2025-71149
# Target Ecosystem    : Generic Systems
# Generated Timestamp : 2026-09-25 07:45:33 UTC
# Execution Context   : Run as root / privileged administrator
# ==============================================================================

set -euo pipefail
IFS=$'\n\t'

echo "[+] Starting automated remediation for advisory: CVE-2025-71149"
echo "[*] Detecting target host package manager..."

if command -v apt-get >/dev/null 2>&1; then
    echo "[*] Debian/Ubuntu detected. Refreshing APT cache and patching security updates..."
    export DEBIAN_FRONTEND=noninteractive
    apt-get update -qq
    apt-get --only-upgrade install -y -qq unattended-upgrades
    unattended-upgrade -d || apt-get dist-upgrade -y -qq
    echo "[✔] Debian/Ubuntu security mitigation complete."
elif command -v dnf >/dev/null 2>&1; then
    echo "[*] RHEL/Fedora/Rocky/AlmaLinux detected. Applying security advisories via DNF..."
    dnf check-update --security || true
    dnf upgrade-minimal --security -y
    echo "[✔] Enterprise Linux security mitigation complete."
elif command -v zypper >/dev/null 2>&1; then
    echo "[*] SUSE/openSUSE detected. Applying security patches via Zypper..."
    zypper refresh -s
    zypper patch --category security -y
    echo "[✔] SUSE Linux security mitigation complete."
elif command -v apk >/dev/null 2>&1; then
    echo "[*] Alpine Linux detected. Upgrading base security packages..."
    apk update
    apk upgrade --no-cache
    echo "[✔] Alpine Linux mitigation complete."
else
    echo "[-] Unknown package manager. Please verify vendor patches manually for CVE-2025-71149." >&2
    exit 1
fi

echo "[✔] Remediation procedure for CVE-2025-71149 executed successfully."
exit 0

<#
.SYNOPSIS
    iShareStuff CTI Fleet Remediation Automation for CVE-2025-71149
.DESCRIPTION
    Applies security updates and checks winget/PSWindowsUpdate for patch resolution.
    Target: Windows Fleet | Generated: 2026-09-25 07:45:33 UTC
#>

#Requires -RunAsAdministrator
[CmdletBinding()]
param(
    [switch]$DryRun = $false
)

Write-Host "[+] Initiating Fleet Security Patch for CVE-2025-71149..." -ForegroundColor Cyan

# 1. Check & Install PSWindowsUpdate if absent
if (-not (Get-Module -ListAvailable -Name PSWindowsUpdate)) {
    Write-Host "[*] Registering PSWindowsUpdate module from PSGallery..." -ForegroundColor Yellow
    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force | Out-Null
    Install-Module -Name PSWindowsUpdate -Force -Confirm:$false | Out-Null
}

# 2. Query Windows Update Catalog for applicable Security KBs
Write-Host "[*] Scanning for pending security hotfixes..." -ForegroundColor Gray
Import-Module PSWindowsUpdate -Force

if ($DryRun) {
    Get-WUList -MicrosoftUpdate
    Write-Host "[!] DryRun active: No changes applied." -ForegroundColor Yellow
    exit 0
}

# 3. Apply Security KBs without uncontrolled reboot
try {
    Install-WindowsUpdate -MicrosoftUpdate -AcceptAll -IgnoreReboot -Verbose
    Write-Host "[✔] Windows Update security rollups successfully deployed." -ForegroundColor Green
} catch {
    Write-Warning "[-] Windows Update failed or returned pending reboot: $_"
}

# 4. Optional Winget Userland Upgrade Check
if (Get-Command winget.exe -ErrorAction SilentlyContinue) {
    Write-Host "[*] Auditing installed software via Winget..." -ForegroundColor Gray
    winget upgrade --all --accept-package-agreements --accept-source-agreements --silent || true
}

Write-Host "[✔] Host remediation audit completed for CVE-2025-71149." -ForegroundColor Green

---
# ==============================================================================
# iShareStuff CTI Multi-OS Fleet Remediation Playbook
# Advisory Reference : CVE-2025-71149
# Target Infrastructure : Heterogeneous Fleets
# Timestamp : 2026-09-25 07:45:33 UTC
# ==============================================================================
- name: "CTI Remediation Playbook for CVE-2025-71149"
  hosts: all
  become: true
  gather_facts: true

  tasks:
    - name: "Log remediation initiation for CVE-2025-71149"
      ansible.builtin.debug:
        msg: "Executing automated patch mitigation for advisory CVE-2025-71149 on {{ inventory_hostname }}"

    # Debian & Ubuntu Automation
    - name: "Update apt cache and install security updates (Debian/Ubuntu)"
      ansible.builtin.apt:
        upgrade: dist
        update_cache: yes
        autoremove: yes
      when: ansible_os_family == "Debian"

    # RedHat / CentOS / Alma / Rocky Automation
    - name: "Apply all security errata via DNF/YUM (Enterprise Linux)"
      ansible.builtin.dnf:
        name: "*"
        state: latest
        security: yes
      when: ansible_os_family == "RedHat"

    # SUSE Linux Automation
    - name: "Apply security patches via Zypper (SUSE)"
      community.general.zypper:
        type: patch
        category: security
        state: latest
      when: ansible_os_family == "Suse"

    # Windows Fleet Automation
    - name: "Install critical and security Windows Updates"
      ansible.windows.win_updates:
        category_names:
          - SecurityUpdates
          - CriticalUpdates
          - UpdateRollups
        state: installed
      when: ansible_os_family == "Windows"

    - name: "Record audit completion timestamp"
      ansible.builtin.file:
        path: "/var/log/isharestuff_cti_CVE-2025-71149.remediated"
        state: touch
        mode: "0640"
      when: ansible_os_family != "Windows"

#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2025-71149
table inet iss_quarantine {
    chain inbound_lockdown {
        type filter hook input priority -10; policy drop;

        # Allow established connections & loopback
        ct state established,related accept
        iif "lo" accept

        # Whitelist SOC / Bastion Management Subnet
        ip saddr 10.0.0.0/8 accept
        ip saddr 192.168.1.0/24 accept

        # Explicitly log & drop vulnerable service traffic
        tcp dport 443 log prefix "[ISS-QUARANTINE-CVE-2025-71149] " drop
    }
}

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: quarantine-CVE-2025-71149
  namespace: production
  labels:
    security.isharestuff.com/quarantine: "true"
    cve.mitigation/id: "CVE-2025-71149"
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/vulnerable-cve: "CVE-2025-71149"
  policyTypes:
    - Ingress
    - Egress
  ingress:
    # Restrict ingress solely to authorized security scanners & bastion pods
    - from:
        - namespaceSelector:
            matchLabels:
              kubernetes.io/metadata.name: soc-monitoring
      ports:
      - port: 443
        protocol: TCP
  egress:
    # Allow DNS only (isolate lateral movement)
    - to:
        - namespaceSelector: {}
          podSelector:
            matchLabels:
              k8s-app: kube-dns
      ports:
        - port: 53
          protocol: UDP

aws ec2 revoke-security-group-ingress --group-id sg-0123456789abcdef0 --protocol tcp --port 443 --cidr 0.0.0.0/0

(http.request.uri.path contains "CVE-2025-71149" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)