In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Keep internal commands dispatchable during error handling… (CVE-2026-98478)

The Linux kernel's SCSI UFS core switched internal commands to use the pseudo SCSI device's request queue, which shares the host tagset with regular logical units. During error recovery, the entire tagset is quiesced, including the pseudo device queue, causing internal commands issued afterward to be skipped and resulting in a circular wait deadlock. The patch modifies the error handling to keep the pseudo device queue unquiesced while the logical units remain quiesced, allowing internal commands to proceed and avoiding deadlock. Clock scaling and pause command processing remain unaffected as they continue to quiesce the entire tagset.

This vulnerability can cause an unrecoverable circular wait deadlock during error recovery in the UFS SCSI subsystem of the Linux kernel. This deadlock can halt internal command processing, potentially affecting system stability and recovery from errors involving UFS devices.

A fix has been implemented in the Linux kernel to address this issue by adjusting the quiescing behavior during error handling. Users should apply the official kernel update containing this fix once available. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor or Linux kernel advisory for the current remediation guidance.