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CVE-2026-98764: Linux

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix NULL pointer dereference in FUNCTIONFS_ENDPOINT_DESC When user space sets up FunctionFS with only full-speed descriptors (e.g., flags = FUNCTIONFS_HAS_FS_DESC) and the gadget operates at a higher speed (such as USB_SPEED_HIGH or USB_SPEED_SUPER), config_ep_by_speed() detects that the function lacks descriptors for the current speed, logs a warning, and falls back to full-speed descriptors. The endpoint is then successfully enabled via usb_ep_enable(), and epfile->ep becomes valid. However, when user space subsequently issues the FUNCTIONFS_ENDPOINT_DESC ioctl to query the endpoint descriptor, ffs_epfile_ioctl() selects the descriptor index solely based on gadget->speed: switch (epfile->ffs->gadget->speed) { case USB_SPEED_SUPER: case USB_SPEED_SUPER_PLUS: desc_idx = 2; break; case USB_SPEED_HIGH: desc_idx = 1; break; default: desc_idx = 0; } desc = epfile->ep->descs[desc_idx]; memcpy(&desc1, desc, desc->bLength); Because user space only supplied full-speed descriptors, epfile->ep->descs[1] is NULL. Dereferencing desc->bLength triggers an immediate kernel NULL pointer dereference panic. Fix this by falling back through lower speed descriptors if the current speed descriptor was not supplied, matching the fallback logic in config_ep_by_speed() and historical f_fs behavior. If still missing, fall back to epfile->ep->ep->desc (the active descriptor), and return -EINVAL safely if no valid descriptor is found. In addition, mark desc as const to match struct usb_ep::desc and avoid discarding qualifiers.

    Засегнати продукти

    • Linux Linux: c559a353410939c0884e83bdb0e2420a986ac53b преди c5f452e057df6ef89300523d13ad6833bfd199cd; c559a353410939c0884e83bdb0e2420a986ac53b преди e5b9d6bb2a8906a1188c9a90cc8d102de3f07cad; c559a353410939c0884e83bdb0e2420a986ac53b преди 7ef0ad5f462fa95bc4c6647d097d7c0384245b9c; c559a353410939c0884e83bdb0e2420a986ac53b преди 06ac8609d6d185ac18c1d6a6a8a9b99e398bd124; c559a353410939c0884e83bdb0e2420a986ac53b преди 9d8761b3c133f6c6a6d3486839dac60e2cf4bfe3; c559a353410939c0884e83bdb0e2420a986ac53b преди 7811d8e26c77f8eea79e22d0d14c67ec0658b348; c559a353410939c0884e83bdb0e2420a986ac53b преди 35ab269602e1f7c4c0fe6ea3477264bea77eced3; c559a353410939c0884e83bdb0e2420a986ac53b преди 9cd072788c76595529eb38f42bf94d23852f8534
    • Linux Linux: 3.18; преди 3.18; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.56 до 6.18.*; 7.2.10 до 7.2.*; от 7.3 нататък

    История

    • 18 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98764: Linux | freedomonline.bg