CVE-2026-64103 (GCVE-0-2026-64103)
Vulnerability from cvelistv5
Published
2026-07-19 15:40
Modified
2026-07-19 15:40
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: isci: Fix use-after-free in device removal path The ISCI completion tasklet is initialized in isci_host_alloc() (drivers/scsi/isci/init.c:496) and scheduled from both MSI-X and legacy interrupt handlers (drivers/scsi/isci/host.c:223,613). isci_host_deinit() stops the controller and waits for stop completion, but it never kills completion_tasklet before teardown continues. A top-of-function tasklet_kill() is not sufficient here: interrupts are only disabled when isci_host_stop_complete() runs, so until wait_for_stop() returns the IRQ handlers can still requeue the tasklet. The tasklet callback also re-enables interrupts after draining completions, so killing the tasklet before the source is quiesced leaves the same race open. Once wait_for_stop() returns, no further IRQ-driven scheduling can occur. Kill completion_tasklet there so teardown cannot race a queued tasklet running on a dead ihost. On remove or unload, the stale callback can otherwise dereference ihost and touch ihost->smu_registers after the host lifetime ends. A UML + KASAN analogue reproduced the failure class both with no tasklet_kill() and with tasklet_kill() placed before source quiesce, and stayed clean once the kill happened after quiescing the scheduling source. This mirrors commit f6ab594672d4 ("scsi: aic94xx: fix use-after-free in device removal path"), but ISCI needs the kill after wait_for_stop().
References
Impacted products
Vendor Product Version
Linux Linux Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
Version: 6f231dda68080759f1aed3769896e94c73099f0f
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/isci/host.c"
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      ],
      "cpeApplicability": [
        {
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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 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-\u003esmu_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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:07.372Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "scsi: isci: Fix use-after-free in device removal path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64103",
    "datePublished": "2026-07-19T15:40:07.372Z",
    "dateReserved": "2026-07-19T07:54:57.034Z",
    "dateUpdated": "2026-07-19T15:40:07.372Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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