CVE-2026-68373
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.
Gravité et risque d'exploitation
CVE-2026-68373 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.*, <fb1b50ab699211e777dca5ccfb648788b6a6e519, <=6.12.*, 6.12.101, 0, <=7.1.*, 5.15.216, <bcde7249d45f52f994a9872bedf45994472ade77, <=5.10.*, 2.6.30, <=6.6.*, <b406f33d234f98c8b310fdab5cbb492d85e98e49, <61a799ffd1e5a4fd3702d547828b7ff3d161468e, 6.18.42, 7.1.6, 6.1.183, <e165a1d295e7e814e13b0f92c86e5d48309509ce, <2.6.30, <=6.18.*, <4875680d1703f56afa6257ba30244f2fb44ed205, <=*, <=5.15.*, 1264b951463a00efebe1bb596499aaad620ec8af, <cb831aff2f850f72bc5ff5ad77d0a70bb5a84061, 5.10.265, 6.6.148, 7.2, <f742d9c98b5c504fc9e6744eef13a721c2aea486) 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/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061
- https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205
- https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49
- https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce
- https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77
- https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519
- https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486
- https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e