CVE-2026-64103 (GCVE-0-2026-64103)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40
VLAI
Title
scsi: isci: Fix use-after-free in device removal path
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < 1412995e10c74644b47f242aea6e4f3d4180e806 (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < a83d3e4daba40d49324cec1c51ed261e1ea48cf1 (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < ab2266601a875982f2d2033f41e070a6d5e615e2 (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < 309c6058622d080fe8c2fab87c30da82d834d989 (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < cb9e72c50e6c81a5903f27e0b397ce8525d7539b (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < b9ff8631006233ba246828ac70409d2cb2da38d3 (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < 6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c (git)
Affected: 6f231dda68080759f1aed3769896e94c73099f0f , < b52a8d52c3125ec9a93106ed816582368de34426 (git)
Create a notification for this product.
Linux Linux Affected: 3.0
Unaffected: 0 , < 3.0 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "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()."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426"
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      ],
      "title": "scsi: isci: Fix use-after-free in device removal path",
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    "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"
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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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/isci/host.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"1412995e10c74644b47f242aea6e4f3d4180e806\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"a83d3e4daba40d49324cec1c51ed261e1ea48cf1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"ab2266601a875982f2d2033f41e070a6d5e615e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"309c6058622d080fe8c2fab87c30da82d834d989\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"cb9e72c50e6c81a5903f27e0b397ce8525d7539b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"b9ff8631006233ba246828ac70409d2cb2da38d3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6f231dda68080759f1aed3769896e94c73099f0f\",\"lessThan\":\"b52a8d52c3125ec9a93106ed816582368de34426\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/isci/host.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1412995e10c74644b47f242aea6e4f3d4180e806\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/309c6058622d080fe8c2fab87c30da82d834d989\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d40f2f103bb30f52f3dbadbe2c3fdf274a9763c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a83d3e4daba40d49324cec1c51ed261e1ea48cf1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ab2266601a875982f2d2033f41e070a6d5e615e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b52a8d52c3125ec9a93106ed816582368de34426\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9ff8631006233ba246828ac70409d2cb2da38d3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb9e72c50e6c81a5903f27e0b397ce8525d7539b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T06:22:53+00:00",
      "cve": "CVE-2026-64103",
      "id": "CVE-2026-64103",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: isci: Fix use-after-free in device removal path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64103.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.