CVE-2024-26748

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

usb: cdns3: fix memory double free when handle zero packet

829 if (request->complete) {

830 spin_unlock(&priv_dev->lock);

831 usb_gadget_giveback_request(&priv_ep->endpoint,

832 request);

833 spin_lock(&priv_dev->lock);

834 }

835

836 if (request->buf == priv_dev->zlp_buf)

837 cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);

Driver append an additional zero packet request when queue a packet, which

length mod max packet size is 0. When transfer complete, run to line 831,

usb_gadget_giveback_request() will free this requestion. 836 condition is

true, so cdns3_gadget_ep_free_request() free this request again.

Log:

[ 1920.140696][ T150] BUG: KFENCE: use-after-free read in cdns3_gadget_giveback+0x134/0x2c0 [cdns3]

[ 1920.140696][ T150]

[ 1920.151837][ T150] Use-after-free read at 0x000000003d1cd10b (in kfence-#36):

[ 1920.159082][ T150]

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References