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CVE-2026-31578: Linux

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CVSS

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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: media: as102: fix to not free memory after the device is registered in as102_usb_probe() In as102_usb driver, the following race condition occurs: ``` CPU0 CPU1 as102_usb_probe() kzalloc(); // alloc as102_dev_t .... usb_register_dev(); fd = sys_open("/path/to/dev"); // open as102 fd .... usb_deregister_dev(); .... kfree(); // free as102_dev_t .... sys_close(fd); as102_release() // UAF!! as102_usb_release() kfree(); // DFB!! ``` When a USB character device registered with usb_register_dev() is later unregistered (via usb_deregister_dev() or disconnect), the device node is removed so new open() calls fail. However, file descriptors that are already open do not go away immediately: they remain valid until the last reference is dropped and the driver's .release() is invoked. In as102, as102_usb_probe() calls usb_register_dev() and then, on an error path, does usb_deregister_dev() and frees as102_dev_t right away. If userspace raced a successful open() before the deregistration, that open FD will later hit as102_release() --> as102_usb_release() and access or free as102_dev_t again, occur a race to use-after-free and double-free vuln. The fix is to never kfree(as102_dev_t) directly once usb_register_dev() has succeeded. After deregistration, defer freeing memory to .release(). In other words, let release() perform the last kfree when the final open FD is closed.

    Засегнати продукти

    • Linux Linux: cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 0d36653a3a821e5a974798adb347b3ea09332914; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 25d500cf391e384356a612b85cf60b353ad3cd0c; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 07ceb444c8f627cf863864d4274b5a77769725ed; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди cb8092038e95dc1113a68e63762de40fff61ba71; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 582fbecb3756330006fe1950762412a68c2cacd2; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 09e9206008b887aa553733bd915d73131071a086; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 2eeae47a438694408189138048a786be99954032; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 7e5aedf6059cba2a669d86caeaf5a51f33ec85a1; cd19f7d3e39b3160595d56bb3e3a2bf4f7f4669c преди 8bd29dbe03fc5b0f039ab2395ff37b64236d2f0c
    • Linux Linux: 3.14; преди 3.14; 5.10.258 до 5.10.*; 5.15.209 до 5.15.*; 6.1.175 до 6.1.*; 6.6.136 до 6.6.*; 6.12.83 до 6.12.*; 6.18.24 до 6.18.*; 6.19.14 до 6.19.*; 7.0.1 до 7.0.*; 7.1 до *

    История

    • 24 април 2026 Публикувано

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    CVE-2026-31578: Linux | freedomonline.bg