CVE-2026-64216

🎯 CVE-2026-64216 🇪🇺 EUVD

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CVE-2026-64216 | In the Linux kernel, the following vulnerability has been resolved: netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages() netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it is wanting to unlock and compares that to rreq->no_unlock_folio so that it doesn't unlock a folio being read for netfs_perform_write() or netfs_write_begin(). However, given that netfs_unlock_abandoned_read_pages() is called _after_ NETFS_RREQ_IN_PROGR

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

netfs: Fix potential UAF in netfs_unlock_abandoned_read_pages()

netfs_unlock_abandoned_read_pages(rreq) accesses the index of the folios it
is wanting to unlock and compares that to rreq->no_unlock_folio so that it
doesn't unlock a folio being read for netfs_perform_write() or
netfs_write_begin().

However, given that netfs_unlock_abandoned_read_pages() is called _after_
NETFS_RREQ_IN_PROGRESS is cleared, the one folio that it's not allowed to
dereference is the one specified by ->no_unlock_folio as ownership
immediately reverts to the caller.

Fix this by storing the folio pointer instead and using that rather than
the index. Also fix netfs_unlock_read_folio() where the same applies.

Klassifikation & Betroffenheit:

Linux Linux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <dbe556972100fabb8e5a1b3d2163831ff07b1e8eLinux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <6080fa3ecfbb4448a3b47368629534c09b6ec750Linux patch: 7.1Linux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <3866d015f33aeedf81338dd99154703bef33faefLinux 6.12Linux ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <d4ae8dba90b89e7bb4d1045d1cb26afbaf13ee5cLinux patch: 7.0.11Linux patch: 6.12.106

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-2026-74705 10.0 CVE-2026-74612 10.0 CVE-2026-74475 10.0 CVE-2026-74309 10.0 CVE-2026-74280 10.0

🩹 Patch verfügbar (OSV):

🩹 Kernel ≥ 6.12.106 🩹 Kernel ≥ 6.18.34 🩹 Kernel ≥ 7.0.11

🇩🇪 BSI-Sicherheitshinweise: BSI · mittel · Linux Kernel: Mehrere Schwachstellen ↗

📚 Referenzen & Quellen:

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

Ausnutzungs-Zeitleiste:

Reserviert 2026

Veröffentlicht 07/2026

Heute 19.10.

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

CNA-Bewertung (Linux): 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Veröffentlicht:24.07.2026

Aktualisiert:27.08.2026 13:18

Assigner (CNA):Linux

EUVD-ID:EUVD-2026-48624

Quellen: 🇪🇺 EUVD-Datenbank (ENISA) + 🇺🇸 NVD-Anreicherung · 24-h-Cache

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

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

Tier	CVEs	Anteil
≥90 %	723	0,2 %
≥50 %	3.221	0,9 %
≥10 %	22.089	5,9 %
<10 %	345.625	93,0 %

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