firewall security

About this tag
The firewall security tag on WindowsForum covers Linux kernel vulnerabilities in netfilter and nf_tables, which are core to packet filtering in firewalls, containers, and routers. Discussions include CVE-2026-45901, a deadlock fix removing commit_mutex from reset paths, and CVE-2026-31674, an IPv6 ip6t_rt match flaw that could allow out-of-bounds access. The tag also addresses operational security concerns, such as verifying OpenSSH guides for Windows Server 2016 to avoid opening port 22 based on unreliable sources, and urgent patching for CVE-2026-0300, a PAN-OS root RCE in the User-ID Portal exploited in the wild. These topics highlight the importance of firewall security in mixed Windows-Linux environments and the need for careful patch management.

  1. Linux Kernel CVE-2026-45901: nf_tables Deadlock Fix Removes commit_mutex

    Linux kernel CVE-2026-45901 was published by NVD on May 27, 2026, after kernel.org assigned a security record to a netfilter nf_tables fix that removes commit_mutex locking from reset paths to avoid a circular lock dependency triggered by concurrent nft reset, ipset list, and iptables-nft -m set...
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    • cve-2026-45901 firewall security linux kernel netfilter nf_tables
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    • Forum: Security Alerts

  2. Spot Search-Polluted SSH Guides: Verify OpenSSH on Windows Server 2016 Before Open Port 22

    The page titled “Install OpenSSH On Microsoft Windows Server 2016 And Open Ssh Port 22 In Windows Firewall” appears to be an unrelated, likely auto-generated or compromised Fathom Journal page mixing Windows Server administration keywords with a political magazine archive, not a trustworthy...
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    • firewall security openssh windows remote administration windows server 2016
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    • Forum: Windows News

  3. CISA KEV: CVE-2026-0300 PAN-OS Root RCE on User-ID Portal—Urgent Patch Actions

    On May 6, 2026, CISA added CVE-2026-0300, a Palo Alto Networks PAN-OS out-of-bounds write flaw in the User-ID Authentication Portal, to its Known Exploited Vulnerabilities catalog after evidence showed active exploitation against exposed firewall portals in the wild and federal agencies were put...
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    • cisa kev edge device rce firewall security pan-os vulnerability
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    • Forum: Security Alerts

  4. CVE-2026-31674 Netfilter IPv6 Bug: Why Windows Teams Must Patch Linux Kernels

    CVE-2026-31674 is the kind of Linux kernel flaw that looks modest at first glance but deserves careful attention from anyone responsible for Linux firewalls, container hosts, routers, appliances, or mixed Windows-Linux infrastructure. The issue sits in netfilter, specifically the IPv6 ip6t_rt...
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    • firewall security linux kernel netfilter ipv6 windows-linux security
    • Replies: 0
    • Forum: Security Alerts