Linux Kernel Missing Initialization of a Variable Vulnerability
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the…
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 3 / 5
- Catalogue KEV (CISA)28/10/2026
- EUVD exploitée (ENISA)28/10/2026
- Utilisée par des rançongicielsnon
- EPSS au-dessus de 10 %16,1 %
- 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: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
Texte de la source, en anglais.
Produits touchés
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <2f2b16022a2e10ca7bccfb98db5ed2ec0f72641c
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <f84eca5817390257cef78013d0112481c503b4a3
- patch: 6.18.33
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <760e1addc27ba1a7beb4a0a7e8b3e9ec49e7a34e
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <78bf6b6bb19541d19fbda6242e7cfe2c682763c0
- patch: 0
- patch: 7.1
- patch: 6.1.174
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <9d3e5fd19fe1063bf607219e8562fbd567b8e8d5
- cef401de7be8c4e155c6746bfccf721a4fa5fab9 <3884358a9286b17f389a72b1426fc4547c23c111
- patch: 7.0.10
- 3.9
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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EPSS au plus haut : 16,1 %
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Échéance de correction CISA
Références
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