CVE-2026-89524
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.
Gravité et risque d'exploitation
CVE-2026-89524 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 18.6 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <3.2, <=6.12.*, <d337213a889705a69735079606d0b4c672b17605, 5.15.221, <e3619bed5da125713b29ac881dc66f5e06606f88, 5.10.270, 0, 7.2.4, 6.1.188, <=5.10.*, <=6.6.*, <3bbd05723d15dd06f0560bcd94fbf9a91b5f5613, 6.6.157, <8eb73016fb3968cf2db3987a92764563a3af773a, bdcd81707973cf8aa9305337166f8ee842a050d4, <6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9, <e1330d719c047c4d8190a16be034b29fc601a815, <=6.18.*, 3.2, <e11d5ae96d5e52cb48fa27c6ad352d766d0322fb, <=7.2.*, <225587bdbf4b0eb5265a71ee4dc183561a1857fc, <=*, <=5.15.*, 6.18.50, 6.12.109, 7.3) 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
- https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc
- https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605
- https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb
- https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9
- https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88
- https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815
- https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a
- https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613