scsi: ufs: core: Keep internal commands dispatchable during error handling

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Keep internal commands dispatchable during error handling Commit 08b12cda6c44 ("scsi: ufs: core: Switch to scsi_get_internal_cmd()") switched UFS internal commands to allocate requests on hba->host->pseudo_sdev->request_queue, which shares the host tagset with regular LUNs. During error recovery, ufshcd_err_handling_prepare() calls blk_mq_quiesce_tagset(&hba->host->tag_set), marking all queues in the tagset as quiesced, including pseudo_sdev->request_queue. When ufshcd_verify_dev_init() subsequently issues internal commands (e.g. NOP OUT UPIU) via blk_execute_rq(), blk_mq_run_hw_queue() skips running the quiesced queue, resulting in an unrecoverable circular wait deadlock. Keep quiescing the tagset and unquiesce the pseudo SCSI device on top of that, so internal commands stay dispatchable while the logical units remain quiesced. Re-quiesce the pseudo device before unquiescing the tagset so that quiesce_depth stays balanced. Clock scaling and ufshcd_pause_command_processing() are unaffected: they keep quiescing the whole tagset, internal commands included.

Timeline

1. Oct 18, 2026, 3:15 PM UTCCVE published
2. Oct 19, 2026, 9:20 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 08b12cda6c44dc015bcc152613c35ee0ae8f37b9 · fixed in 9f6f4840def931814c106fc800f57a2d26befee6; From 08b12cda6c44dc015bcc152613c35ee0ae8f37b9 · fixed in b52d695d062095327b944acf7daabbc816ab319b

• Linux Linux

  6.19

• KernelLinux

  From 6.19.0 · fixed in 7.2.9

References 2