Linux Kernel Unspecified Vulnerability
In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen),…
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)27/08/2026
- EUVD exploitée (ENISA)27/08/2026
- Utilisée par des rançongicielsnon
- EPSS au-dessus de 10 %0,71 %
- 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: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info. An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES. The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.
Texte de la source, en anglais.
Produits touchés
- patch: 6.1.177
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <736b380e28d0480c7bc3e022f1950f31fe53a7c5
- 6.0
- patch: 6.6.144
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <14200d435af9a9eeb444f529fc2f689a236b7962
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <6374fb9edf72c67a118a2c214a0dddd04c921e0a
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <65fb14cbebb0cd0eff903a22d33537ddc8b95769
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <46f201f8b4c39633a1fa3dc12459f506d470993d
- patch: 6.12.95
- patch: 6.18.38
- 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 <e9eacf19281ea2498b36291b56c9606118c2d74e
- patch: 7.2
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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