Ubuntu: (CVE-2022-48890): linux-azure vulnerability

Ubuntu: (CVE-2022-48890): linux-azure vulnerability

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

08/21/2024

Created

11/21/2024

Added

11/19/2024

Modified

01/30/2025

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.

Solution(s)

• ubuntu-upgrade-linux-azure
• ubuntu-upgrade-linux-azure-5-15
• ubuntu-upgrade-linux-azure-fde
• ubuntu-upgrade-linux-azure-fde-5-15

References

• https://attackerkb.com/topics/cve-2022-48890
• CVE - 2022-48890
• https://git.kernel.org/linus/67ff3d0a49f3d445c3922e30a54e03c161da561e
• https://git.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561e
• https://git.kernel.org/stable/c/87c71e88f6a6619ffb1ff88f84dff48ef6d57adb
• https://www.cve.org/CVERecord?id=CVE-2022-48890