Към съдържанието
Търсене

CVE-2026-74677: Linux

Няма оценка

CVSS

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: usb: ipheth: fix carrier_work UAF on disconnect ipheth_sndbulk_callback() re-arms the carrier-check work on any non-zero URB status: else schedule_delayed_work(&dev->carrier_work, 0); Nothing ties that to the interface being up, so the work can be armed again after ipheth_close() has already drained it, and stay armed until the netdev whose private area embeds it is freed. On unplug with a TX URB in flight, ipheth_disconnect() drains the work through unregister_netdev() -> ipheth_close() -> cancel_delayed_work_sync() and only then calls ipheth_kill_urbs(). usb_kill_urb() completes the in-flight TX URB with -ENOENT, so ipheth_sndbulk_callback() runs after the drain and re-arms carrier_work. The same completion also re-arms the work if the interface is only brought down while a TX URB is in flight, and ipheth_carrier_check_work() then keeps re-queueing itself once a second. unregister_netdev() does not call ipheth_close() for an already-down interface, so nothing drains it on the later unplug either. In both cases free_netdev() frees the netdev while carrier_work is still pending, and ipheth_carrier_check_work() dereferences freed memory. Tie the work to the interface state instead of chasing the completion: disable it in ipheth_close() and enable it in ipheth_open(), so a schedule_delayed_work() from the URB completion is a no-op whenever the interface is not up. disable_delayed_work_sync() also waits for a running instance, so it fully replaces the cancel_delayed_work_sync() it takes the place of. The work starts out disabled in ipheth_probe() so the enable/disable counts balance from the first open. Reproduced under KASAN on linux-next (next-20260731) with dummy_hcd and raw-gadget standing in for the device, driving the second path above (the interface is already down, so unregister_netdev() does not call ipheth_close()): 15 of 15 unpatched boots report a slab-use-after-free in __r

    Засегнати продукти

    • Linux Linux: bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1 преди d07133fe1befae9a1e4c4c5e46ef0b73d2992020; bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1 преди 2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45; bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1 преди 48303f3ae0fa6e102f3fc7dbf1688cc179131962; bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1 преди fde39b8a521780391fb4e5bda2c0aa4928947f12; 4f2df9fd07698bece3321fbf9e4b6dbcb9babccc; ea7d6be58c2e6c1f426b48994bb22b2393c90963; f5bca75dc46701f4c0d1dcbaae401233ae7ff06b; 4.4.180 преди 4.5; 4.9.173 преди 4.10; 4.14.116 преди 4.15
    • Linux Linux: 4.15; преди 4.15; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

    История

    • 22 август 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-74677: Linux | freedomonline.bg