CVE-2022-50215

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

scsi: sg: Allow waiting for commands to complete on removed device

When a SCSI device is removed while in active use, currently sg will

immediately return -ENODEV on any attempt to wait for active commands that

were sent before the removal. This is problematic for commands that use

SG_FLAG_DIRECT_IO since the data buffer may still be in use by the kernel

when userspace frees or reuses it after getting ENODEV, leading to

corrupted userspace memory (in the case of READ-type commands) or corrupted

data being sent to the device (in the case of WRITE-type commands). This

has been seen in practice when logging out of a iscsi_tcp session, where

the iSCSI driver may still be processing commands after the device has been

marked for removal.

Change the policy to allow userspace to wait for active sg commands even

when the device is being removed. Return -ENODEV only when there are no

more responses to read.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References