CVE-2026-74508
Vulnérabilité élevée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: HIDP: reject frames without a transaction header hidp_recv_ctrl_frame() and hidp_recv_intr_frame() read skb->data[0] before checking that the L2CAP SDU contains a transaction header. A connected HIDP peer can send an empty basic-mode SDU and make both paths use an uninitialized byte from skb tailroom. KMSAN reports the use in hidp_session_run(), with the uninitialized value originating in __alloc_skb() through vhci_write(). The control path produces two reports and the interrupt path produces one. The byte can also be controlled by a malformed lower-layer packet. If an HCI ACL packet contains an L2CAP PDU with a declared zero-length payload followed by an extra 0x15 byte, l2cap_recv_acldata() reduces skb->len to the declared PDU length before dispatch. The current HIDP path nevertheless consumes the extra byte as HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG and terminates the HIDP session. With this change, the same packet is discarded and a subsequent feature report request succeeds. Pull the transaction header with skb_pull_data() and discard frames that do not contain it.
Gravité et risque d'exploitation
CVE-2026-74508 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.26 %, ce qui la place devant 16.9 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 2.6.12, 0, <=7.1.*, <854194494a6f726a60b90b76059148bf08df023d, <2.6.12, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 5.15.216, 6.12.103, <567a2a0a633f2ea5fdccaf3517c09f22c9d860c7, <24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8, <=5.10.*, <238c333bc4b3f245c626632e8bfa3c9dab97f51b, <=6.6.*, 5.10.266, 6.1.183, <=6.18.*, <=*, <=5.15.*, 7.1.8, 6.18.44, 6.6.151, <46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec, 7.2, <47778d2c2087b5d192398f6fddf692d16a5431cf, <97b61241ab45bfa5b0526cb0f3978942493bc811, <2ebf63aa557a69990b4e9ea22be224d58aabce96) 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/24c64ccd5c1fc9934b427335b0d976c7f2b1a7d8
- https://git.kernel.org/stable/c/238c333bc4b3f245c626632e8bfa3c9dab97f51b
- https://git.kernel.org/stable/c/567a2a0a633f2ea5fdccaf3517c09f22c9d860c7
- https://git.kernel.org/stable/c/46ca5ab39737d7c6f9ca77ecf714cdcfa6caaeec
- https://git.kernel.org/stable/c/97b61241ab45bfa5b0526cb0f3978942493bc811
- https://git.kernel.org/stable/c/2ebf63aa557a69990b4e9ea22be224d58aabce96
- https://git.kernel.org/stable/c/854194494a6f726a60b90b76059148bf08df023d
- https://git.kernel.org/stable/c/47778d2c2087b5d192398f6fddf692d16a5431cf
