USN-8278-2: Linux kernel (Azure) vulnerabilities

It was discovered that the Linux kernel algif_aead module did not properly
handle in-place cryptographic operations. This flaw is known as Copy Fail.
A local attacker could use this to escalate privileges, or possibly escape
a container. (CVE-2026-31431)

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:
- ARM64 architecture;
- x86 architecture;
- Cryptographic API;
- Compute Acceleration Framework;
- Drivers core;
- Null block device driver;
- Ublk userspace block driver;
- Bluetooth drivers;
- Counter interface drivers;
- DMA engine subsystem;
- DPLL subsystem;
- GPU drivers;
- HID subsystem;
- Intel Trace Hub HW tracing drivers;
- IIO ADC drivers;
- IIO subsystem;
- On-Chip Interconnect management framework;
- IRQ chip drivers;
- Modular ISDN driver;
- LED subsystem;
- Multiple devices driver;
- UACCE accelerator framework;
- MMC subsystem;
- Ethernet bonding driver;
- Network drivers;
- Mellanox network drivers;
- NVME drivers;
- PHY drivers;
- x86 platform drivers;
- i.MX PM domains;
- SCSI subsystem;
- SLIMbus drivers;
- SPI subsystem;
- TCM subsystem;
- W1 Dallas's 1-wire bus driver;
- Xen hypervisor drivers;
- BTRFS file system;
- EFI Variable file system;
- exFAT file system;
- Ext4 file system;
- HFS+ file system;
- Network file system (NFS) client;
- Network file system (NFS) server daemon;
- NTFS3 file system;
- SMB network file system;
- Scheduler infrastructure;
- Netfilter;
- NFC subsystem;
- Tracing infrastructure;
- io_uring subsystem;
- BPF subsystem;
- Perf events;
- Floating proportions library;
- Memory management;
- Bluetooth subsystem;
- CAN network layer;
- Ceph Core library;
- Networking core;
- IPv4 networking;
- IPv6 networking;
- L2TP protocol;
- MAC80211 subsystem;
- NET/ROM layer;
- Packet sockets;
- Network traffic control;
- SCTP protocol;
- TLS protocol;
- Unix domain sockets;
- VMware vSockets driver;
- Wireless networking;
- ALSA AC97 driver;
- Generic PCM loopback sound driver;
- Creative Sound Blaster X-Fi driver;
- AMD SoC Alsa drivers;
- Texas InstrumentS Audio (ASoC/HDA) drivers;
- USB sound devices;
- KVM subsystem;
(CVE-2024-50004, CVE-2024-58096, CVE-2024-58097, CVE-2025-37926,
CVE-2025-38201, CVE-2025-38591, CVE-2025-40039, CVE-2025-40082,
CVE-2025-40149, CVE-2025-68351, CVE-2025-68358, CVE-2025-68365,
CVE-2025-68725, CVE-2025-68749, CVE-2025-68803, CVE-2025-68823,
CVE-2025-71160, CVE-2025-71162, CVE-2025-71163, CVE-2025-71180,
CVE-2025-71182, CVE-2025-71183, CVE-2025-71184, CVE-2025-71185,
CVE-2025-71186, CVE-2025-71188, CVE-2025-71189, CVE-2025-71190,
CVE-2025-71191, CVE-2025-71192, CVE-2025-71193, CVE-2025-71194,
CVE-2025-71195, CVE-2025-71196, CVE-2025-71197, CVE-2025-71198,
CVE-2025-71199, CVE-2025-71200, CVE-2025-71220, CVE-2025-71222,
CVE-2025-71224, CVE-2025-71225, CVE-2025-71268, CVE-2026-22976,
CVE-2026-22977, CVE-2026-22978, CVE-2026-22979, CVE-2026-22980,
CVE-2026-22982, CVE-2026-22984, CVE-2026-22990, CVE-2026-22991,
CVE-2026-22992, CVE-2026-22994, CVE-2026-22996, CVE-2026-22997,
CVE-2026-22998, CVE-2026-22999, CVE-2026-23000, CVE-2026-23001,
CVE-2026-23003, CVE-2026-23005, CVE-2026-23006, CVE-2026-23010,
CVE-2026-23011, CVE-2026-23019, CVE-2026-23020, CVE-2026-23021,
CVE-2026-23025, CVE-2026-23026, CVE-2026-23030, CVE-2026-23031,
CVE-2026-23032, CVE-2026-23033, CVE-2026-23035, CVE-2026-23037,
CVE-2026-23038, CVE-2026-23047, CVE-2026-23049, CVE-2026-23050,
CVE-2026-23053, CVE-2026-23054, CVE-2026-23056, CVE-2026-23057,
CVE-2026-23058, CVE-2026-23059, CVE-2026-23061, CVE-2026-23062,
CVE-2026-23063, CVE-2026-23064, CVE-2026-23065, CVE-2026-23068,
CVE-2026-23069, CVE-2026-23071, CVE-2026-23073, CVE-2026-23075,
CVE-2026-23076, CVE-2026-23078, CVE-2026-23080, CVE-2026-23083,
CVE-2026-23084, CVE-2026-23085, CVE-2026-23086, CVE-2026-23087,
CVE-2026-23088, CVE-2026-23089, CVE-2026-23090, CVE-2026-23091,
CVE-2026-23093, CVE-2026-23094, CVE-2026-23095, CVE-2026-23096,
CVE-2026-23097, CVE-2026-23098, CVE-2026-23099, CVE-2026-23101,
CVE-2026-23102, CVE-2026-23103, CVE-2026-23105, CVE-2026-23107,
CVE-2026-23108, CVE-2026-23110, CVE-2026-23113, CVE-2026-23116,
CVE-2026-23119, CVE-2026-23120, CVE-2026-23121, CVE-2026-23123,
CVE-2026-23124, CVE-2026-23125, CVE-2026-23126, CVE-2026-23128,
CVE-2026-23129, CVE-2026-23131, CVE-2026-23133, CVE-2026-23135,
CVE-2026-23136, CVE-2026-23139, CVE-2026-23140, CVE-2026-23141,
CVE-2026-23142, CVE-2026-23144, CVE-2026-23145, CVE-2026-23146,
CVE-2026-23148, CVE-2026-23150, CVE-2026-23151, CVE-2026-23156,
CVE-2026-23159, CVE-2026-23160, CVE-2026-23163, CVE-2026-23164,
CVE-2026-23166, CVE-2026-23167, CVE-2026-23168, CVE-2026-23170,
CVE-2026-23172, CVE-2026-23173, CVE-2026-23176, CVE-2026-23178,
CVE-2026-23179, CVE-2026-23180, CVE-2026-23182, CVE-2026-23187,
CVE-2026-23190, CVE-2026-23191, CVE-2026-23193, CVE-2026-23198,
CVE-2026-23200, CVE-2026-23202, CVE-2026-23204, CVE-2026-23205,
CVE-2026-23206, CVE-2026-23212, CVE-2026-23213, CVE-2026-23214,
CVE-2026-23215, CVE-2026-23216, CVE-2026-23254, CVE-2026-23256,
CVE-2026-23257, CVE-2026-23258, CVE-2026-23260, CVE-2026-23261,
CVE-2026-23262, CVE-2026-23264, CVE-2026-23274, CVE-2026-23351,
CVE-2026-23394, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533,
CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)

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-8278-2: Linux kernel (Azure) vulnerabilities
id: 62006d16-f99e-486b-a8a0-d393e0e20f99
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-2026-31431'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access
  - cve.2026-31431

rule CTI_CVE_2026_31431 {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for CVE-2026-31431"
    strings:
        $cve = "CVE-2026-31431" ascii wide
    condition:
        any of them
}

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("CVE-2026-31431" OR CommandLine="*CVE-2026-31431*")
| 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-2026-31431" or message: "*CVE-2026-31431*"

CommonSecurityLog
| where AdditionalExtensions has "CVE-2026-31431" or Message has "CVE-2026-31431"
| 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-2026-31431
# Target Ecosystem    : Linux
# Generated Timestamp : 2026-09-25 09:36:01 UTC
# Execution Context   : Run as root / privileged administrator
# ==============================================================================

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

echo "[+] Starting automated remediation for advisory: CVE-2026-31431"
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-2026-31431." >&2
    exit 1
fi

echo "[✔] Remediation procedure for CVE-2026-31431 executed successfully."
exit 0

<#
.SYNOPSIS
    iShareStuff CTI Fleet Remediation Automation for CVE-2026-31431
.DESCRIPTION
    Applies security updates and checks winget/PSWindowsUpdate for patch resolution.
    Target: Linux | Generated: 2026-09-25 09:36:01 UTC
#>

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

Write-Host "[+] Initiating Fleet Security Patch for CVE-2026-31431..." -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-2026-31431." -ForegroundColor Green

---
# ==============================================================================
# iShareStuff CTI Multi-OS Fleet Remediation Playbook
# Advisory Reference : CVE-2026-31431
# Target Infrastructure : Linux
# Timestamp : 2026-09-25 09:36:01 UTC
# ==============================================================================
- name: "CTI Remediation Playbook for CVE-2026-31431"
  hosts: all
  become: true
  gather_facts: true

  tasks:
    - name: "Log remediation initiation for CVE-2026-31431"
      ansible.builtin.debug:
        msg: "Executing automated patch mitigation for advisory CVE-2026-31431 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-2026-31431.remediated"
        state: touch
        mode: "0640"
      when: ansible_os_family != "Windows"

#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2026-31431
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-2026-31431] " drop
    }
}

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: quarantine-CVE-2026-31431
  namespace: production
  labels:
    security.isharestuff.com/quarantine: "true"
    cve.mitigation/id: "CVE-2026-31431"
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/vulnerable-cve: "CVE-2026-31431"
  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-2026-31431" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)