{"id":"CVE-2026-64103","title":"scsi: isci: Fix use-after-free in device removal path","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: isci: Fix use-after-free in device removal path\n\nThe ISCI completion tasklet is initialized in isci_host_alloc()\n(drivers/scsi/isci/init.c:496) and scheduled from…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 1412995e10c74644b47f242aea6e4f3d4180e806","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < a83d3e4daba40d49324cec1c51ed261e1ea48cf1","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < ab2266601a875982f2d2033f41e070a6d5e615e2","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 309c6058622d080fe8c2fab87c30da82d834d989","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < cb9e72c50e6c81a5903f27e0b397ce8525d7539b","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < b9ff8631006233ba246828ac70409d2cb2da38d3","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c","Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < b52a8d52c3125ec9a93106ed816582368de34426","Linux 3.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:29:53.116202Z"},"published":"2026-07-19","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:34:25.863Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64103","references":[{"url":"https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806"},{"url":"https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1"},{"url":"https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2"},{"url":"https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989"},{"url":"https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539b"},{"url":"https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3"},{"url":"https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c"},{"url":"https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426"}],"tags":["cve.org"],"epss":0.00126,"epssPercentile":0.02268,"ingestedAt":"2026-11-06T16:57:43.237Z","slug":"CVE-2026-64103","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: isci: Fix use-after-free in device removal path\n\nThe ISCI completion tasklet is initialized in isci_host_alloc()\n(drivers/scsi/isci/init.c:496) and scheduled from both MSI-X and legacy\ninterrupt handlers (drivers/scsi/isci/host.c:223,613).\n\nisci_host_deinit() stops the controller and waits for stop completion,\nbut it never kills completion_tasklet before teardown continues. A\ntop-of-function tasklet_kill() is not sufficient here: interrupts are\nonly disabled when isci_host_stop_complete() runs, so until\nwait_for_stop() returns the IRQ handlers can still requeue the\ntasklet. The tasklet callback also re-enables interrupts after draining\ncompletions, so killing the tasklet before the source is quiesced leaves\nthe same race open.\n\nOnce wait_for_stop() returns, no further IRQ-driven scheduling can\noccur. Kill completion_tasklet there so teardown cannot race a queued\ntasklet running on a dead ihost. On remove or unload, the stale callback\ncan otherwise dereference ihost and touch ihost->smu_registers after the\nhost lifetime ends.\n\nA UML + KASAN analogue reproduced the failure class both with no\ntasklet_kill() and with tasklet_kill() placed before source quiesce, and\nstayed clean once the kill happened after quiescing the scheduling\nsource.\n\nThis mirrors commit f6ab594672d4 (\"scsi: aic94xx: fix use-after-free in\ndevice removal path\"), but ISCI needs the kill after wait_for_stop().\n\n## Affected\n\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 1412995e10c74644b47f242aea6e4f3d4180e806`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < a83d3e4daba40d49324cec1c51ed261e1ea48cf1`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < ab2266601a875982f2d2033f41e070a6d5e615e2`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 309c6058622d080fe8c2fab87c30da82d834d989`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < cb9e72c50e6c81a5903f27e0b397ce8525d7539b`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < b9ff8631006233ba246828ac70409d2cb2da38d3`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < 6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c`\n- `Linux >= 6f231dda68080759f1aed3769896e94c73099f0f < b52a8d52c3125ec9a93106ed816582368de34426`\n- `Linux 3.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}