{ "document": { "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "nl", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." }, { "category": "description", "text": "Linux heeft kwetsbaarheden verholpen in de IPv4 TCP stack en het IPv4 networking subsystem van de Linux kernel.", "title": "Feiten" }, { "category": "description", "text": "De eerste kwetsbaarheid betreft een race condition in de IPv4 TCP stack die leidt tot een use-after-free van socketopties tijdens gelijktijdige TCP SYN retransmissies of request socket migraties. Dit kan resulteren in systeeminstabiliteit of geheugenbeschadiging. De oorzaak is het voortijdig vrijgeven van inet_opt en ireq_opt structuren.\n\nDe tweede kwetsbaarheid betreft een onjuiste validatie van checksum metadata in IPv4 pakketten, waardoor lokale aanvallers of onbetrouwbare gast-virtuele machines malformed checksum data kunnen gebruiken om willekeurige code op de host uit te voeren, systeemcrashes te veroorzaken of gevoelige informatie te lekken. Deze kwetsbaarheid, bekend als PwnEscape, maakt gast-naar-host ontsnapping mogelijk.\n\nHoewel door de complexiteit van misbruik en binnen de bekende distro's aanwezige aanvullende maatregelen, grootschalig misbruik niet waarschijnlijk is, zijn deze kwetsbaarheden in de linux-kernel toch opvallend, aangezien kwetsbaarheden in de netwerkstacks van de kernel een van de weinige soorten kwetsbaarheden zijn die op afstand en zonder voorafgaande authenticatie zijn te misbruiken, maar wel potentieel de kernel in gevaar brengen.", "title": "Interpretaties" }, { "category": "description", "text": "De ontwikkelaars van Linux hebben updates uitgebracht die de kwetsbaarheden verhelpen. De grote Linux distributie vendors nemen deze updates op in de huidige kernels. Zie bijgevoegde referenties voor meer informatie.", "title": "Oplossingen" }, { "category": "general", "text": "medium", "title": "Kans" }, { "category": "general", "text": "high", "title": "Schade" }, { "category": "general", "text": "Out-of-bounds Write", "title": "CWE-787" }, { "category": "general", "text": "Expired Pointer Dereference", "title": "CWE-825" } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "Nationaal Cyber Security Centrum", "namespace": "https://www.ncsc.nl/" }, "references": [ { "category": "external", "summary": "Reference", "url": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98432.mbox" }, { "category": "external", "summary": "Reference", "url": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-99999.mbox" } ], "title": "Kwetsbaarheden verholpen in Linux kernel", "tracking": { "current_release_date": "2026-10-30T12:08:35.850611Z", "generator": { "date": "2025-08-04T16:30:00Z", "engine": { "name": "V.A.", "version": "1.3" } }, "id": "NCSC-2026-0461", "initial_release_date": "2026-10-30T12:08:35.850611Z", "revision_history": [ { "date": "2026-10-30T12:08:35.850611Z", "number": "1.0.0", "summary": "Initiele versie" } ], "status": "final", "version": "1.0.0" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-1" } } ], "category": "product_name", "name": "linux" } ], "category": "vendor", "name": "Debian" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-2" } } ], "category": "product_name", "name": "Linux" } ], "category": "vendor", "name": "Linux" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-3" } } ], "category": "product_name", "name": "azl3 kernel 6.6.157.1-1 on Azure Linux 3.0" } ], "category": "vendor", "name": "Microsoft" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-4" } } ], "category": "product_name", "name": "Linux kernel" } ], "category": "vendor", "name": "NetApp" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-5" } } ], "category": "product_name", "name": "Nutanix AHV" } ], "category": "vendor", "name": "Nutanix" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-6" } } ], "category": "product_name", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-7" } } ], "category": "product_name", "name": "RESF Rocky Linux" } ], "category": "vendor", "name": "RESF" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-8" } } ], "category": "product_name", "name": "Red Hat Enterprise Linux" } ], "category": "vendor", "name": "Red Hat" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-9" } } ], "category": "product_name", "name": "SUSE openSUSE" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/*", "product": { "name": "vers:unknown/*", "product_id": "CSAFPID-10" } } ], "category": "product_name", "name": "SuSE Linux" } ], "category": "vendor", "name": "SUSE" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-98432", "cwe": { "id": "CWE-825", "name": "Expired Pointer Dereference" }, "notes": [ { "category": "other", "text": "Expired Pointer Dereference", "title": "CWE-825" }, { "category": "description", "text": "A Linux kernel vulnerability in the IPv4 TCP stack involving use-after-free of socket options during concurrent SYN processing and request socket migration was fixed by deferring freeing of inet_opt and ireq_opt until after an RCU grace period using kfree_rcu().", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8", "CSAFPID-9", "CSAFPID-10" ] }, "references": [ { "category": "self", "summary": "CVE-2026-98432 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-98432.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8", "CSAFPID-9", "CSAFPID-10" ] } ], "title": "CVE-2026-98432" }, { "cve": "CVE-2026-99999", "cwe": { "id": "CWE-787", "name": "Out-of-bounds Write" }, "notes": [ { "category": "other", "text": "Out-of-bounds Write", "title": "CWE-787" }, { "category": "description", "text": "A Linux kernel vulnerability in the IPv4 networking subsystem allows local attackers or untrusted guest VMs to exploit malformed checksum metadata, potentially leading to arbitrary code execution, system crashes, or information leaks.", "title": "Summary" } ], "product_status": { "known_affected": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8", "CSAFPID-9", "CSAFPID-10" ] }, "references": [ { "category": "self", "summary": "CVE-2026-99999 | NCSC-NL Website", "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-99999.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 9.3, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-1", "CSAFPID-2", "CSAFPID-3", "CSAFPID-4", "CSAFPID-5", "CSAFPID-6", "CSAFPID-7", "CSAFPID-8", "CSAFPID-9", "CSAFPID-10" ] } ], "title": "CVE-2026-99999" } ] }