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CVE-2026-74754

scsi: core: pair EH runtime PM get and put PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: scsi: core: pair EH runtime PM get and put shost->eh_noresume is currently consulted twice in one error handling iteration: once before scsi_autopm_get_host() and once again before scsi_autopm_put_host(). That is racy when a PM-triggered error path flips shost->eh_noresume while the SCSI EH thread is still running. The problem flow looks like this: PM path ufshcd_set_dev_pwr_mode() shost->eh_noresume = 1 ufshcd_execute_start_stop <-- trigger EH ... shost->eh_noresume = 0 EH path scsi_error_handler() if (!shost->eh_noresume) scsi_autopm_get_host() <-- skipped ... if (!shost->eh_noresume) scsi_autopm_put_host() <-- executed later In that case one EH iteration can skip autoresume on entry and still drop a runtime PM reference on exit. That leaves an unmatched runtime PM put and can trigger a runtime PM usage count underflow. Fix this by making eh_noresume a regular bool so it can be accessed with READ_ONCE() and WRITE_ONCE(). Snapshot it once per EH iteration and use that snapshot for both runtime PM get and put decisions.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected ae0751ffc77e7f21629970fdab5528c573e637f8 before 1ec5f6aa38ea990af37c49af7a4bb3db00da7f9d; affected ae0751ffc77e7f21629970fdab5528c573e637f8 before 0038a2a75a15d163f428c93103c6d02d4d231a7a; affected ae0751ffc77e7f21629970fdab5528c573e637f8 before fdc93f4a801077efbf1b87570ade8d8f325de62f; affected ae0751ffc77e7f21629970fdab5528c573e637f8 before e83eed1bea142c8fe852fd53156845b88252ecd8; affected ae0751ffc77e7f21629970fdab5528c573e637f8 before 872f486259ae0bc6b73ca4735a15d013241f73e9
Linux / Linuxaffected 3.3; unaffected 0 before 3.3; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through *

CWE

No CWE identifiers supplied.

References