# CVE-2022-48890: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: storvsc: Fix swiotlb bounce buffer leak in...

CVE-2022-48890 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48890, released August 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48890
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM  storvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(), which in a confidential VM allocates swiotlb bounce buffers. If the I/O submission fails in storvsc_do_io(), the I/O is typically retried by higher level code, but the bounce buffer memory is never freed.  The mostly like cause of I/O submission failure is a full VMBus channel ring buffer, which is not uncommon under high I/O loads.  Eventually enough bounce buffer memory leaks that the confidential VM can't do any I/O. The same problem can arise in a non-confidential VM with kernel boot parameter swiotlb=force.  Fix this by doing scsi_dma_unmap() in the case of an I/O submission error, which frees the bounce buffer memory.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.7-1 | [DEBIAN-CVE-2022-48890](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48890.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.7-1 | [DEBIAN-CVE-2022-48890](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48890.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.7-1 | [DEBIAN-CVE-2022-48890](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48890.md) | Aug 21, 2024 |

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