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CVE-2026-64091

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.4%
Linux•Linux•Versions : <=6.1.*, <=7.0.*, <=6.12.*, 6.12.93, 4.9.217, 0, <724a8eb4155669797c96b70d70e354284ae3b5a8, <65a1e67339aa8c95ac544b796946af388930ee23, <b4d4efd4e351593c81e9293d4b4408d244fa5ee7, <4.10, 6.1.176, 3.16.60, 16116dac23396e73c01eeee97b102e4833a4b205, 5.15.210, <4.17, <=5.10.*, 90ae6475b1753f0c1a4c66034b5666de3189fac8, 3134c5a32810c510f1f447c135cec346acbb71c3, <=6.6.*, <94d27005016be15ffc638b2ecbc4d58805ad7b48, <4.5, <211ea59988e1cba43cb0367ad65d379b56f9c3bd, 4.17, 6.18.34, 0b81edc8818903c64c4d121bc51cd5825be8cc67, 7.1, <=6.18.*, 7.0.11, e861e03a1b5b615ad1b57b1802b17e260eedccfe, <4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f, <e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b, <=*, <=5.15.*, 4.14.174, <3.17, <9a9c859457bc440a55773e01ff18b1bb5bab6836, 6.6.143, <4.15, 4.4.217, 5.10.259

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix TOCTOU race for reported vlans The local TT based TVLV is generated by first checking the number of VLANs which have at least one TT entry. A new buffer with the correct size for the VLANs is then allocated. Only then, the list of VLANs s used to fill the VLAN entries in the buffer. During this time, the meshif_vlan_list_lock is held. But the actual number of TT entries of each VLAN can still increase during this time - just not the number of VLANs in the list. But the prefilter used in the buffer size calculation might still cause an increase of the number of VLANs which need to be stored. Simply because a VLAN might now suddenly have at least one entry when it had none in the pre-alloc check - and then needs to occupy space which was not allocated. It is better to overestimate the buffer size at the beginning and then fill the buffer only with the VLANs which are not empty.

Gravité et risque d'exploitation

CVE-2026-64091 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.43 %, ce qui la place devant 35.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=7.0.*, <=6.12.*, 6.12.93, 4.9.217, 0, <724a8eb4155669797c96b70d70e354284ae3b5a8, <65a1e67339aa8c95ac544b796946af388930ee23, <b4d4efd4e351593c81e9293d4b4408d244fa5ee7, <4.10, 6.1.176, 3.16.60, 16116dac23396e73c01eeee97b102e4833a4b205, 5.15.210, <4.17, <=5.10.*, 90ae6475b1753f0c1a4c66034b5666de3189fac8, 3134c5a32810c510f1f447c135cec346acbb71c3, <=6.6.*, <94d27005016be15ffc638b2ecbc4d58805ad7b48, <4.5, <211ea59988e1cba43cb0367ad65d379b56f9c3bd, 4.17, 6.18.34, 0b81edc8818903c64c4d121bc51cd5825be8cc67, 7.1, <=6.18.*, 7.0.11, e861e03a1b5b615ad1b57b1802b17e260eedccfe, <4cc85aec8d3c9ab4dc716dc9f1ed36fca16b227f, <e4236bf3ec8d6bb15d0d8d825dcf9933a7d6666b, <=*, <=5.15.*, 4.14.174, <3.17, <9a9c859457bc440a55773e01ff18b1bb5bab6836, 6.6.143, <4.15, 4.4.217, 5.10.259) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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