Към съдържанието
Търсене

CVE-2026-46123: Linux

7.7

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, без вход и без действие от потребителя.

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: Bluetooth: virtio_bt: clamp rx length before skb_put virtbt_rx_work() calls skb_put(skb, len) where len comes directly from virtqueue_get_buf() with no validation against the buffer we posted to the device. The RX skb is allocated in virtbt_add_inbuf() and exposed to virtio as exactly 1000 bytes via sg_init_one(). Checking len against skb_tailroom(skb) is not sufficient because alloc_skb() can leave more tailroom than the 1000 bytes actually handed to the device. A malicious or buggy backend can therefore report used.len between 1001 and skb_tailroom(skb), causing skb_put() to include uninitialized kernel heap bytes that were never written by the device. The same path also accepts len == 0, in which case skb_put(skb, 0) leaves the skb empty but virtbt_rx_handle() still reads the pkt_type byte from skb->data, consuming uninitialized memory. Define VIRTBT_RX_BUF_SIZE once and reuse it in alloc_skb() and sg_init_one(), and gate virtbt_rx_work() on that same constant so the bound checked matches the buffer actually exposed to the device. Reject used.len == 0 in the same gate so an empty completion can no longer reach virtbt_rx_handle(). Use bt_dev_err_ratelimited() because the length value comes from an untrusted backend that can otherwise flood the kernel log. Same class of bug as commit c04db81cd028 ("net/9p: Fix buffer overflow in USB transport layer"), which hardened the USB 9p transport against unchecked device-reported length.

    Засегнати продукти

    • Linux Linux: cf2719a21fdb9d4c8e9c834d279163609bef575d преди 4236e55b2d9d1ffd3b4bdf8ebbb86e5a0a526b4a; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди fd91fa2678ab603dfb285416c1cf3843d7be1e41; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди ed41c81d30b211a671667259c3b5feeba0e062d5; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 6c1730099a6fc18b183bd6c1adad3b54adcaeda9; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди b40cdd1b1370d76e9e760af4490cb4a351cceead; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди e6b4296f170d949ebba937cf6a3f247ec9550d2c; 160fbcf3bfb93c3c086427f9f4c8bc70f217e9be преди 21bd244b6de5d2fe1063c23acc93fbdd2b20d112; 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

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-46123: Linux | freedomonline.bg