# CVE-2021-47523: linux: In the Linux kernel, the following vulnerability has been resolved:  IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr  Th...

CVE-2021-47523 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47523, released May 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47523
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr  This buffer is currently allocated in hfi1_init():  	if (reinit) 		ret = init_after_reset(dd); 	else 		ret = loadtime_init(dd); 	if (ret) 		goto done;  	/* allocate dummy tail memory for all receive contexts */ 	dd->rcvhdrtail_dummy_kvaddr = dma_alloc_coherent(&dd->pcidev->dev, 							 sizeof(u64), 							 &dd->rcvhdrtail_dummy_dma, 							 GFP_KERNEL);  	if (!dd->rcvhdrtail_dummy_kvaddr) { 		dd_dev_err(dd, "cannot allocate dummy tail memory\n"); 		ret = -ENOMEM; 		goto done; 	}  The reinit triggered path will overwrite the old allocation and leak it.  Fix by moving the allocation to hfi1_alloc_devdata() and the deallocation to hfi1_free_devdata().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47523](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47523.md) | May 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47523](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47523.md) | May 24, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47523](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47523.md) | May 24, 2024 |

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