CVE-2026-74555 is a vulnerability in Linux Kernel
Published on August 15, 2026
scsi: libsas: Fix HA resume deadlock and hisi_sas disk-wake race
In the Linux kernel, the following vulnerability has been resolved:
scsi: libsas: Fix HA resume deadlock and hisi_sas disk-wake race
Commit fbefe22811c3 ("scsi: libsas: Don't always drain event workqueue
for HA resume") introduced sas_resume_ha_no_sync() to avoid a deadlock:
the PHYE_RESUME_TIMEOUT handler, running on the HA event workqueue,
calls sas_deform_port() -> sas_destruct_devices(), which removes SCSI
devices and waits for the host to become runtime-active. But the host
cannot resume until sas_resume_ha() -> sas_drain_work() returns, and the
drain is blocked on that very handler.
However skipping the drain reintroduces a race: hisi_sas returns from
resume before all PHY UP work and libsas discovery work finish. The
controller may then autosuspend while disks are still waking up. The
disks issue IO to a suspended controller, the IO fails, and the disks
get disabled.
Fix the deadlock at its source by moving the PHYE_RESUME_TIMEOUT
notification to after sas_drain_work(). By then the host resume is about
to complete, so device removal through device_link no longer blocks on
the resume and the cycle is broken.
With the deadlock gone, restore sas_resume_ha() (the draining variant)
in hisi_sas and remove sas_resume_ha_no_sync().
The reorder is safe for the other libsas consumers (isci, pm8001,
aic94xx, mvsas). During suspend, sas_suspend_devices() calls
sas_notify_lldd_dev_gone() for each device, which sets dev->lldd_dev to
NULL. When scsi_unblock_requests re-enables I/O in resume, any I/O to a
timed-out phy's disk is immediately rejected by the LLDD before reaching
hardware: isci returns SAS_DEVICE_UNKNOWN (mapped to DID_BAD_TARGET),
and pm8001 returns SAS_PHY_DOWN (mapped to DID_NO_CONNECT). Both
complete directly via scsi_done() without entering SCSI EH. This is
identical in both the old and new ordering since lldd_dev_gone runs
during suspend, before resume. The reorder only affects when the
PHYE_RESUME_TIMEOUT handler runs (synchronized by sas_drain_work()
vs. asynchronous after resume returns), not whether I/O can reach the
device. aic94xx and mvsas do not register any PM ops and never reach
this code path.
Products Associated with CVE-2026-74555
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Affected Versions
Linux:- Version fbefe22811c3140a686e407e114789ebf328a9a2 and below e50a6523a603594a6d92cdecfe11997d639410a3 is affected.
- Version fbefe22811c3140a686e407e114789ebf328a9a2 and below c391b5899dd46485a5893696c12ae3e95a3a7325 is affected.
- Version fbefe22811c3140a686e407e114789ebf328a9a2 and below 9e24b47ef81d43b3fb1b14294f09991640c79fcc is affected.
- Version fbefe22811c3140a686e407e114789ebf328a9a2 and below b9c44a14062093e9fc2d6bddc696cfceadb482d7 is affected.
- Version fbefe22811c3140a686e407e114789ebf328a9a2 and below 3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845 is affected.
- Version 5.17 is affected.
- Before 5.17 is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2-rc6, <= * is unaffected.