# CVE-2021-47622: linux: In the Linux kernel, the following vulnerability has been resolved:  scsi: ufs: Fix a deadlock in the error handler...

CVE-2021-47622 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47622, released July 16, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47622
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 16, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  scsi: ufs: Fix a deadlock in the error handler  The following deadlock has been observed on a test setup:   - All tags allocated   - The SCSI error handler calls ufshcd_eh_host_reset_handler()   - ufshcd_eh_host_reset_handler() queues work that calls    ufshcd_err_handler()   - ufshcd_err_handler() locks up as follows:  Workqueue: ufs_eh_wq_0 ufshcd_err_handler.cfi_jt Call trace:  __switch_to+0x298/0x5d8  __schedule+0x6cc/0xa94  schedule+0x12c/0x298  blk_mq_get_tag+0x210/0x480  __blk_mq_alloc_request+0x1c8/0x284  blk_get_request+0x74/0x134  ufshcd_exec_dev_cmd+0x68/0x640  ufshcd_verify_dev_init+0x68/0x35c  ufshcd_probe_hba+0x12c/0x1cb8  ufshcd_host_reset_and_restore+0x88/0x254  ufshcd_reset_and_restore+0xd0/0x354  ufshcd_err_handler+0x408/0xc58  process_one_work+0x24c/0x66c  worker_thread+0x3e8/0xa4c  kthread+0x150/0x1b4  ret_from_fork+0x10/0x30  Fix this lockup by making ufshcd_exec_dev_cmd() allocate a reserved request.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.11-1 | [DEBIAN-CVE-2021-47622](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47622.md) | Jul 16, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.11-1 | [DEBIAN-CVE-2021-47622](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47622.md) | Jul 16, 2024 |
| Linux | linux Debian 14 | 5.16.11-1 | [DEBIAN-CVE-2021-47622](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47622.md) | Jul 16, 2024 |

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