{"id":"CVE-2026-74555","summary":"scsi: libsas: Fix HA resume deadlock and hisi_sas disk-wake race","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libsas: Fix HA resume deadlock and hisi_sas disk-wake race\n\nCommit fbefe22811c3 (\"scsi: libsas: Don't always drain event workqueue\nfor HA resume\") introduced sas_resume_ha_no_sync() to avoid a deadlock:\nthe PHYE_RESUME_TIMEOUT handler, running on the HA event workqueue,\ncalls sas_deform_port() -\u003e sas_destruct_devices(), which removes SCSI\ndevices and waits for the host to become runtime-active. But the host\ncannot resume until sas_resume_ha() -\u003e sas_drain_work() returns, and the\ndrain is blocked on that very handler.\n\nHowever skipping the drain reintroduces a race: hisi_sas returns from\nresume before all PHY UP work and libsas discovery work finish. The\ncontroller may then autosuspend while disks are still waking up. The\ndisks issue IO to a suspended controller, the IO fails, and the disks\nget disabled.\n\nFix the deadlock at its source by moving the PHYE_RESUME_TIMEOUT\nnotification to after sas_drain_work(). By then the host resume is about\nto complete, so device removal through device_link no longer blocks on\nthe resume and the cycle is broken.\n\nWith the deadlock gone, restore sas_resume_ha() (the draining variant)\nin hisi_sas and remove sas_resume_ha_no_sync().\n\nThe reorder is safe for the other libsas consumers (isci, pm8001,\naic94xx, mvsas). During suspend, sas_suspend_devices() calls\nsas_notify_lldd_dev_gone() for each device, which sets dev-\u003elldd_dev to\nNULL. When scsi_unblock_requests re-enables I/O in resume, any I/O to a\ntimed-out phy's disk is immediately rejected by the LLDD before reaching\nhardware: isci returns SAS_DEVICE_UNKNOWN (mapped to DID_BAD_TARGET),\nand pm8001 returns SAS_PHY_DOWN (mapped to DID_NO_CONNECT). Both\ncomplete directly via scsi_done() without entering SCSI EH. This is\nidentical in both the old and new ordering since lldd_dev_gone runs\nduring suspend, before resume. The reorder only affects when the\nPHYE_RESUME_TIMEOUT handler runs (synchronized by sas_drain_work()\nvs. asynchronous after resume returns), not whether I/O can reach the\ndevice. aic94xx and mvsas do not register any PM ops and never reach\nthis code path.","modified":"2026-08-21T03:30:42.440585871Z","published":"2026-08-15T12:28:00.729Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74555.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/09357f067122e2e28ec52e27013a1660a1571618"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9e24b47ef81d43b3fb1b14294f09991640c79fcc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b9c44a14062093e9fc2d6bddc696cfceadb482d7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c391b5899dd46485a5893696c12ae3e95a3a7325"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e50a6523a603594a6d92cdecfe11997d639410a3"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74555.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74555"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fbefe22811c3140a686e407e114789ebf328a9a2"},{"fixed":"09357f067122e2e28ec52e27013a1660a1571618"},{"fixed":"e50a6523a603594a6d92cdecfe11997d639410a3"},{"fixed":"c391b5899dd46485a5893696c12ae3e95a3a7325"},{"fixed":"9e24b47ef81d43b3fb1b14294f09991640c79fcc"},{"fixed":"b9c44a14062093e9fc2d6bddc696cfceadb482d7"},{"fixed":"3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74555.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74555.json"}}],"schema_version":"1.9.0"}