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] cdns3_gadget_giveback+0x134/0x2c0 [cdns3]
[ 1920.164988][ T150] cdns3_transfer_completed+0x438/0x5f8 [cdns3]

Add check at line 829, skip call usb_gadget_giveback_request() if it is
additional zero length packet request. Needn't call
usb_gadget_giveback_request() because it is allocated in this driver.

Classification

CVE ID: CVE-2024-26748

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/aad6132ae6e4809e375431f8defd1521985e44e7
https://git.kernel.org/stable/c/1e204a8e9eb514e22a6567fb340ebb47df3f3a48
https://git.kernel.org/stable/c/3a2a909942b5335b7ea66366d84261b3ed5f89c8
https://git.kernel.org/stable/c/9a52b694b066f299d8b9800854a8503457a8b64c
https://git.kernel.org/stable/c/70e8038813f9d3e72df966748ebbc40efe466019
https://git.kernel.org/stable/c/92d20406a3d4ff3e8be667c79209dc9ed31df5b3
https://git.kernel.org/stable/c/5fd9e45f1ebcd57181358af28506e8a661a260b3

Timeline