CVE-2021-47192 (GCVE-0-2021-47192)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2025-05-04 12:41
VLAI?
Title
scsi: core: sysfs: Fix hang when device state is set via sysfs
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: core: sysfs: Fix hang when device state is set via sysfs This fixes a regression added with: commit f0f82e2476f6 ("scsi: core: Fix capacity set to zero after offlinining device") The problem is that after iSCSI recovery, iscsid will call into the kernel to set the dev's state to running, and with that patch we now call scsi_rescan_device() with the state_mutex held. If the SCSI error handler thread is just starting to test the device in scsi_send_eh_cmnd() then it's going to try to grab the state_mutex. We are then stuck, because when scsi_rescan_device() tries to send its I/O scsi_queue_rq() calls -> scsi_host_queue_ready() -> scsi_host_in_recovery() which will return true (the host state is still in recovery) and I/O will just be requeued. scsi_send_eh_cmnd() will then never be able to grab the state_mutex to finish error handling. To prevent the deadlock move the rescan-related code to after we drop the state_mutex. This also adds a check for if we are already in the running state. This prevents extra scans and helps the iscsid case where if the transport class has already onlined the device during its recovery process then we don't need userspace to do it again plus possibly block that daemon.
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 69aa1a1a569f5c6d554b59352130ef363342ed4c , < edd783162bf2385b43de6764f2d4c6e9f4f6be27 (git)
Affected: 711459514e297d748f15ba1f5292a3276c3d1dd0 , < a792e0128d232251edb5fdf42fb0f9fbb0b44a73 (git)
Affected: f0f82e2476f6adb9c7a0135cfab8091456990c99 , < bcc0e3175a976b7fa9a353960808adb0bb49ead8 (git)
Affected: f0f82e2476f6adb9c7a0135cfab8091456990c99 , < 4edd8cd4e86dd3047e5294bbefcc0a08f66a430f (git)
Affected: c6751ce1a2a415a78e4f5b621628da03196b804c (git)
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    Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.4.162 , ≤ 5.4.* (semver)
Unaffected: 5.10.82 , ≤ 5.10.* (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
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