CVE-2026-53398 — CVE & Security Advisory Radar

🎯 CVE-2026-53398 CRITICAL 9.8 🔥 EPSS 51% 🇪🇺 EUVD

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CVE-2026-53398 | In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A fa

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Fix SECINFO_NO_NAME decode error cleanup

nfsd4_decode_secinfo_no_name() currently initializes sin_exp after
decoding sin_style. If the XDR stream is truncated, the decoder returns
nfserr_bad_xdr before sin_exp is initialized.

Since commit 3fdc54646234 ("NFSD: Reduce amount of struct
nfsd4_compoundargs that needs clearing"), the inline iops array is not
cleared between RPC calls. A failed SECINFO_NO_NAME decode can therefore
leave sin_exp holding stale union contents from a previous operation.

The error response path still invokes nfsd4_secinfo_no_name_release(),
which calls exp_put() on a non-NULL sin_exp.

Initialize sin_exp before the first failable decode step, matching
nfsd4_decode_secinfo().

Klassifikation & Betroffenheit:

Linux Linux 5.15.154 <5.15.211Linux patch: 6.1.177Linux patch: 0Linux 3fdc546462348b8a497c72bc894e0cde9f10fc40 <46eb17d45be69d28c7a23ea03283b207426a8232Linux patch: 5.10.260Linux 3fdc546462348b8a497c72bc894e0cde9f10fc40 <1e04be34cafae119e82bcaccd6d28a20f72a3647Linux 3fdc546462348b8a497c72bc894e0cde9f10fc40 <5ec37edcb534f3fc92304be236d37f08e6545585Linux patch: 5.15.211

Improper Control of Generation of Code ('Code Injection') 🎯 Medium

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

🛡️ Empfohlene Mitigation: Refactor your program so that you do not have to dynamically generate code.

Vollständige Definition bei MITRE ➔

⚔️ Typische Angriffsmuster (CAPEC):

CAPEC-35 · Leverage Executable Code in Non-Executab… (Very High) CAPEC-77 · Manipulating User-Controlled Variables (Very High) CAPEC-242 · Code Injection (High)

🎯 ATT&CK-Techniken (Kill-Chain-Verhalten):

T1027.006 · Obfuscated Files or Information: H… T1027.009 · Obfuscated Files or Information: E… T1564.009 · Hide Artifacts: Resource Forking

🧩 Ähnliche Schwachstellen (Hersteller/Klasse/Score-Band):

CVE-2026-74475 10.0 CVE-2026-74309 10.0 CVE-2026-74280 10.0 CVE-2026-74279 10.0 CVE-2026-72421 10.0

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 5.10.260 🩹 Kernel ≥ 5.15.211 🩹 Kernel ≥ 6.1.177 🩹 Kernel ≥ 6.6.144 🩹 Kernel ≥ 6.12.95 🩹 Kernel ≥ 6.18.38

📚 Referenzen & Quellen:

🇪🇺 Original-Eintrag (ENISA EUVD) 🇺🇸 NVD-Eintrag

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 07/2026

Heute 10.09.

CVSS-Vektor-Analyse: 9.8

AV · Angriffsvektor Netzwerk

AC · Komplexität Gering

PR · Privilegien Keine

UI · Interaktion Keine

S · Scope Unverändert

C · Vertraulichkeit Hoch

I · Integrität Hoch

A · Verfügbarkeit Hoch

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Veröffentlicht:19.07.2026

Aktualisiert:17.08.2026 04:50

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-45520

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

Tier	2026-08-29	2026-09-06
≥90 %	4	0
≥50 %	4	0
≥10 %	3	0
<10 %	304	300

9.8 CRITICAL

🇪🇺 EUVD

EPSS

51%

CVE-2026-53398 🌐 Netzwerk (Remote) 🔓 Keine Authentifizierung nötig

Linux

CVE-2026-53398 | In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix SECINFO_NO_NAME decode error cleanup nfsd4_decode_secinfo_no_name() currently initializes sin_exp after decoding sin_style. If the XDR stream is truncated, the decoder returns nfserr_bad_xdr before sin_exp is initialized. Since commit 3fdc54646234 ("NFSD: Reduce amount of struct nfsd4_compoundargs that needs clearing"), the inline iops array is not cleared between RPC calls. A fa

CWE-94: Code Injection ✓ Offizieller Patch / Advisory verfügbar

💡 Gegenmaßnahme: Kernel-Paket aktualisieren (apt upgrade linux-image / yum update kernel) und System neu starten.

19.07.2026

🛡️ Details ➔

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