Linux Kernel Out-of-Bounds Write Vulnerability
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is…
Gravité = CVSS. Probabilité = EPSS (FIRST). Exploitation = signaux publics : KEV, EUVD, rançongiciel, EPSS au-dessus de 10 %, accès sans compte.
Probabilité d’exploitation EPSS · FIRST
Signaux d’exploitation 2 / 5
- Catalogue KEV (CISA)18/09/2026
- EUVD exploitée (ENISA)18/09/2026
- Utilisée par des rançongicielsnon
- EPSS au-dessus de 10 %0,93 %
- Sans compte, par le réseaunon
Que faire
Corriger
Appliquer le correctif de l’éditeur dès qu’il est disponible.
Consigne de la 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.
En attendant
Retirer le service d’internet ou en filtrer l’accès, surveiller les journaux et chercher des traces de compromission.
Éditeurs (CRA)
Faille exploitée dans votre produit : alerte précoce à l’ENISA sous 24 h, puis notification sous 72 h (article 14 du Cyber Resilience Act). Le CRA expliqué
Description ENISA EUVD
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge ebtables hooks the Ethernet header is addressed through skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet payload. Asking skb_ensure_writable() for ETH_HLEN bytes would check the payload, not the Ethernet header, and would reintroduce the small packet regression fixed by commit 63137bc5882a. However, the optional ARP sender hardware address rewrite is different. It writes through skb_store_bits() at an offset relative to skb->data: skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN) skb_header_pointer() only safely reads the ARP header; it does not make the later sender hardware address range writable. If that range is still held in a nonlinear skb fragment backed by a splice-imported file page, skb_store_bits() maps the frag page and copies the new MAC address directly into it. Ensure the ARP SHA range is writable before reading the ARP header and before calling skb_store_bits().
Texte de la source, en anglais.
Produits touchés
- 63137bc5882a1882c553d389fdeeeace86ee1741 <afd64b59c3de9bbbdd3759e834fdc55cda716e0b
- patch: 0
- 5.4.73 <5.5
- b7d23c2c87584eb429f115c078ed511be8b18e29
- 63137bc5882a1882c553d389fdeeeace86ee1741 <67ba971ae02514d85818fe0c32549ab4bfa3bf49
- 5.9.2 <5.10
- patch: 5.10.259
- 63137bc5882a1882c553d389fdeeeace86ee1741 <153ea96c806aea395daba907a4f88480b6ad5093
- 63137bc5882a1882c553d389fdeeeace86ee1741 <76280b78cc9f23bdc6438e10ad6dff148ef8375b
- 63137bc5882a1882c553d389fdeeeace86ee1741 <c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5
- 5.10
- patch: 6.12.94
Paquets open source OSV
Bibliothèques touchées selon OSV, avec les versions corrigées.
Chronologie
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Publication
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Exploitation signalée (ENISA)
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Ajout au catalogue KEV
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Échéance de correction CISA
Références
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