Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA…
Schweregrad = CVSS. Wahrscheinlichkeit = EPSS (FIRST). Ausnutzung = öffentliche Signale: KEV, EUVD, Ransomware, EPSS über 10 %, ohne Konto.
Ausnutzungswahrscheinlichkeit EPSS · FIRST
Ausnutzungssignale 3 / 5
- KEV-Katalog (CISA)18.09.2026
- In der EUVD ausgenutzt (ENISA)18.09.2026
- Von Ransomware genutztnein
- EPSS über 10 %3,3 %
- Ohne Konto, über das Netzja
Was tun
Beheben
Den Patch des Herstellers einspielen, sobald er verfügbar ist.
Vorgabe der CISA: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Bis dahin
Den Dienst vom Internet nehmen oder den Zugriff einschränken, Protokolle überwachen und nach Kompromittierungsspuren suchen.
Hersteller (CRA)
Ausgenutzte Schwachstelle in Ihrem Produkt: Frühwarnung an die ENISA binnen 24 h, dann Meldung binnen 72 h (Artikel 14 des Cyber Resilience Act). Der CRA erklärt
Beschreibung ENISA EUVD
In the Linux kernel, the following vulnerability has been resolved: tls: fix handling of zero-length records on the rx_list Each recvmsg() call must process either - only contiguous DATA records (any number of them) - one non-DATA record If the next record has different type than what has already been processed we break out of the main processing loop. If the record has already been decrypted (which may be the case for TLS 1.3 where we don't know type until decryption) we queue the pending record to the rx_list. Next recvmsg() will pick it up from there. Queuing the skb to rx_list after zero-copy decrypt is not possible, since in that case we decrypted directly to the user space buffer, and we don't have an skb to queue (darg.skb points to the ciphertext skb for access to metadata like length). Only data records are allowed zero-copy, and we break the processing loop after each non-data record. So we should never zero-copy and then find out that the record type has changed. The corner case we missed is when the initial record comes from rx_list, and it's zero length.
Text der Quelle, auf Englisch.
Betroffene Produkte
- patch: 6.1.149
- patch: 0
- 84c61fe1a75b4255df1e1e7c054c9e6d048da417 <c09dd3773b5950e9cfb6c9b9a5f6e36d06c62677
- patch: 6.17
- 84c61fe1a75b4255df1e1e7c054c9e6d048da417 <3439c15ae91a517cf3c650ea15a8987699416ad9
- 84c61fe1a75b4255df1e1e7c054c9e6d048da417 <2902c3ebcca52ca845c03182000e8d71d3a5196f
- 84c61fe1a75b4255df1e1e7c054c9e6d048da417 <62708b9452f8eb77513115b17c4f8d1a22ebf843
- 84c61fe1a75b4255df1e1e7c054c9e6d048da417 <29c0ce3c8cdb6dc5d61139c937f34cb888a6f42e
- patch: 6.12.44
- patch: 6.6.103
- 6.0
- patch: 6.16.4
Open-Source-Pakete OSV
Betroffene Bibliotheken laut OSV, mit behobenen Versionen.
Zeitverlauf
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Veröffentlichung
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Ausnutzung gemeldet (ENISA)
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Aufnahme in den KEV-Katalog
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CISA-Frist zur Behebung
Referenzen
Weitere ausgenutzte Schwachstellen desselben Herstellers
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