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CVE-2026-46186: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: validate rx pkt_type header length virtbt_rx_handle() reads the leading pkt_type byte from the RX skb and forwards the remainder to hci_recv_frame() for every event/ACL/SCO/ISO type, without checking that the remaining payload is at least the fixed HCI header for that type. After the preceding patch bounds the backend-supplied used.len to [1, VIRTBT_RX_BUF_SIZE], a one-byte completion still reaches hci_recv_frame() with skb->len already pulled to 0. If the byte happened to be HCI_ACLDATA_PKT, the ACL-vs-ISO classification fast-path in hci_dev_classify_pkt_type() dereferences hci_acl_hdr(skb)->handle whenever the HCI device has an active CIS_LINK, BIS_LINK, or PA_LINK connection, reading two bytes of uninitialized RX-buffer data. The same hazard exists for every packet type the driver accepts because none of the switch cases in virtbt_rx_handle() check skb->len against the per-type minimum HCI header size before handing the frame to the core. After stripping pkt_type, require skb->len to cover the fixed header size for the selected type (event 2, ACL 4, SCO 3, ISO 4) before calling hci_recv_frame(); drop ratelimited otherwise. Unknown pkt_type values still take the original kfree_skb() default path. Use bt_dev_err_ratelimited() because both the length and pkt_type values come from an untrusted backend that can otherwise flood the kernel log.

    Засегнати продукти

    • Linux Linux: cf2719a21fdb9d4c8e9c834d279163609bef575d преди 149cfb42ad69c7964fd9f2c43831da9152007129; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 7b2d4c04816cdc887f472caaf7fc966cfc107e40; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 1e1e509b6fd2a42421745bbcd98bd16daad20904; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 2c1143564c71e7497b42d8360a8379ccbb011d3c; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 3485c7236c59c8c34a41af1c4b52982437554e79; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди f743eab6486965f276c7e3f1700895f014fdc6db; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди daf23014e5d975e72ea9c02b5160d3fcf070ea47; 9b67438e315b925a699f0178f4a48baf3d2d6ef4; 5.15.78 преди 5.15.209; 6.0.8 преди 6.1
    • Linux Linux: 6.1; преди 6.1; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.140 до 6.6.*; 6.12.88 до 6.12.*; 6.18.30 до 6.18.*; 7.0.7 до 7.0.*; от 7.1 нататък

    История

    • 28 май 2026 Публикувано

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