CVE-2026-64539

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 0, <4.1, <=7.1.*, <57077eeb586c42f124bc09e018449362223067b3, 6.1.178, 6.12.97, <6f5fb689fdf80bdd143f22a502f9eb1f3c85e286, b44133ff03be30b55f23036e62f403a3f7784fce, <=6.18.*, <f1b4df9c260c51726da2e86e19322825fddeefd0, 4.1, <=*, <09301f1fdf2aef8cce34d0c4650c30e7edb1ced9, <0f0b6232af56441d0a2dcb173cc4f8d8aab39014, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: eir: Fix stack OOB write when prepending the Flags AD eir_create_adv_data() builds the advertising data into a fixed-size buffer ("size", 31 for the legacy path). It may prepend a 3-byte "Flags" AD structure (LE_AD_NO_BREDR on an LE-only controller) and then copies the per-instance data without checking that it still fits: memcpy(ptr, adv->adv_data, adv->adv_data_len); tlv_data_max_len() only reserves those 3 bytes when the user-supplied flags carry a managed-flags bit, so an instance added with flags == 0 is accepted with adv_data_len up to the full buffer. At advertise time the flags are still prepended, and the memcpy() writes 3 + adv_data_len bytes into the size-byte buffer: BUG: KASAN: stack-out-of-bounds in eir_create_adv_data (net/bluetooth/eir.c:301) Write of size 31 at addr ffff88800a547bdc by task kworker/u9:0/65 Workqueue: hci0 hci_cmd_sync_work __asan_memcpy (mm/kasan/shadow.c:106) eir_create_adv_data (net/bluetooth/eir.c:301) hci_update_adv_data_sync (net/bluetooth/hci_sync.c:1310) hci_schedule_adv_instance_sync (net/bluetooth/hci_sync.c:1817) hci_cmd_sync_work (net/bluetooth/hci_sync.c:332) This frame has 1 object: [32, 64) 'cp' The "Flags" structure is added by the kernel, not requested by userspace, so only prepend it when it fits together with the instance advertising data; when there is no room for both, drop the flags rather than the user-provided data. Reachable by a local user with CAP_NET_ADMIN owning an LE-only controller on the legacy advertising path.

Gravité et risque d'exploitation

CVE-2026-64539 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.12 %, ce qui la place devant 1.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, 6.18.40, <=6.12.*, 0, <4.1, <=7.1.*, <57077eeb586c42f124bc09e018449362223067b3, 6.1.178, 6.12.97, <6f5fb689fdf80bdd143f22a502f9eb1f3c85e286, b44133ff03be30b55f23036e62f403a3f7784fce, <=6.18.*, <f1b4df9c260c51726da2e86e19322825fddeefd0, 4.1, <=*, <09301f1fdf2aef8cce34d0c4650c30e7edb1ced9, <0f0b6232af56441d0a2dcb173cc4f8d8aab39014, 7.2) 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