CVE-2026-99202
Low risk· EPSS 6%Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, the libsas (SCSI) subsystem has a deadlock during HA resume. smp_execute_task_sg() calls pm_runtime_get_sync(), which waits for the ongoing resume, while the resume path is blocked in sas_drain_work() waiting for that same SMP command to complete — the deadlock requires an expander-attached SATA disk. The fix replaces the get_sync()/put_sync() pair with pm_runtime_get_noresume()/pm_runtime_put() and adds pm_runtime_resume_and_get() in the BSG path.
Risk Assessment
The deadlock can hang the controller resume and make disks attached through the SATA expander unavailable, causing data access loss and requiring a system restart. It occurs only in a specific hardware configuration (SATA disk behind an expander) during HA resume operations.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-99202. If updating is not possible, avoid HA resume operations on systems with SATA disks attached through an expander.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: scsi: libsas: Fix SMP IO deadlock during HA resume smp_execute_task_sg() calls pm_runtime_get_sync() on the host before issuing an SMP command. When that command is itself issued from the HA resume path, the get_sync() deadlocks: it waits for the ongoing resume (the device is RPM_RESUMING), while the resume is blocked in sas_drain_work() waiting for that same SMP IO to complete. The deadlock needs an expander-attached SATA disk. During sas_resume_ha() -> sas_drain_work(), DISCE_RESUME -> sas_resume_sata() -> ata_sas_port_resume() requests ATA_EH_RESET, and the hard reset for such a disk is done via SMP PHY CONTROL (sas_ata_hard_reset() -> sas_phy_reset() -> sas_smp_phy_control() -> smp_execute_task_sg()). Direct-attached SATA resets through lldd_control_phy() and SSP devices use TMFs, so neither hits this. Replace the get_sync()/put_sync() pair with pm_runtime_get_noresume()/pm_runtime_put(). smp_execute_task_sg() only needs to hold off autosuspend while the SMP is in flight, and it must not try to resume the host: a sync resume issued from the HA resume path itself is what deadlocks, and by the time sas_resume_ha() runs, hw_init has already reinitialized the hardware, so the device is accessible without one. The usage reference is still required. Discovery work normally runs inside an event worker's PM reference, taken at sas_notify_port_event() notify time and held until the handler has flushed the disco queue. sas_rediscover_ex_phy() however requeues DISCE_REVALIDATE_DOMAIN from within the revalidation worker itself, and flush_workqueue() does not wait for work items queued during execution, so that chained revalidation runs with no outer PM reference - without the get_noresume(), its SMP could race autosuspend. For the BSG path, sas_smp_handler() is the only caller which may find the host autosuspended: expander SMP requests do not go through any SCSI device request queue, so nothing else in that path holds the host awake. Resume it there with pm_runtime_resume_and_get() and check the result.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

