# CVE-2024-26748: linux: In the Linux kernel, the following vulnerability has been resolved:  usb: cdns3: fix memory double free when handle z...

CVE-2024-26748 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26748, released April 3, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-26748
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 3, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.82-1 | [DEBIAN-CVE-2024-26748](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26748.md) | Apr 3, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.7.7-1 | [DEBIAN-CVE-2024-26748](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26748.md) | Apr 3, 2024 |
| Linux | linux Debian 14 | 6.7.7-1 | [DEBIAN-CVE-2024-26748](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26748.md) | Apr 3, 2024 |

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