CVE-2026-80553 (GCVE-0-2026-80553)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 12:40
VLAI
Title
s390/vfio_ccw: Cancel existing workqueues
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Cancel existing workqueues The initialization of the io_work and crw_work workqueues begs the question of whether they should be un-initialized. Add the corresponding cleanup tags in _release_dev to ensure work isn't dispatched after the private struct is free'd.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < 87d569cb35a541b31a184faf982540694d4c9a89 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < 7492ca2d0c5d59add01e267be9f5a6eeb8076fd7 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < b94b28c1f0fae53b2f2d6180ae6442c9a1558f67 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < e868ea8be0bc88c6982f48ecf3259d98afd884ae (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < dc47a98abe6714577a25224534dbd356051097a3 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < b7ae0f7993867d009a4b554fc1d6d451c10580a0 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < 77f5e888d2e607a0b3141fb95091ad6ef1cca9a2 (git)
Affected: e5f84dbaea59b4f712dac428c337528b70e1c533 , < 79c60b2c61105368dcc8444eb45847e21734f7c4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.153 , ≤ 6.6.* (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/s390/cio/vfio_ccw_ops.c"
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                  "versionStartIncluding": "4.12",
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                  "vulnerable": true
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Cancel existing workqueues\n\nThe initialization of the io_work and crw_work workqueues begs the\nquestion of whether they should be un-initialized. Add the corresponding\ncleanup tags in _release_dev to ensure work isn\u0027t dispatched after\nthe private struct is free\u0027d."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The bug is reached only through local VFIO mediated-device syscalls (read/write/ioctl on /dev/vfio/* and device fds) that start channel I/O or receive CRW events; vfio-ccw has no network, Bluetooth, or physical-bus packet entry point.\nAC:L - This is a close/teardown versus workqueue race where the VFIO client controls both sides: it can submit I/O that queues io_work/crw_work via interrupts or path events, then close or release the device while work is still pending, and retry to win reliably.\nPR:L - Exploitation requires access to an opened vfio-ccw mdev (typical QEMU/libvirt VM operator or delegated /dev/vfio holder on an IBM Z passthrough host), not init-namespace root; mdev creation is admin setup, but triggering the UAF needs only the delegated VFIO fd.\nUI:N - No separate victim action is required; once vfio-ccw passthrough is configured, the attacker issues channel I/O and coordinates device close/release (e.g., hot-unplug or fd teardown) without needing another user to mount media or click anything.\nS:C - On IBM Z/LinuxONE, vfio-ccw exists to pass DASD subchannels into KVM guests; guest-driven channel I/O causes host interrupt/workqueue activity and host-side teardown UAF corrupts hypervisor kernel memory outside the VM security boundary.\nC:H - vfio_ccw_sch_io_todo() and vfio_ccw_crw_todo() dereference freed vfio_ccw_private fields (io_mutex, cp, io_region, crw list, eventfd pointers); per kernel UAF guidance this enables attacker-influenced reuse and arbitrary kernel read primitives.\nI:H - The UAF handlers perform mutex operations, cp_free(), memcpy into io_region, and eventfd_signal() on freed memory, giving heap-sprayable arbitrary write and control-flow hijack potential beyond a simple crash.\nA:H - Use-after-free in deferred I/O/CRW work during device close or release can immediately oops or panic the host kernel from invalid mutex/structure access, and successful exploitation can hang or crash the system even when not leveraged for code execution."
            }
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        "dateUpdated": "2026-08-27T12:40:13.853Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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    "datePublished": "2026-08-26T14:37:21.774Z",
    "dateReserved": "2026-08-26T14:34:25.766Z",
    "dateUpdated": "2026-08-27T12:40:13.853Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-09-01",
      "epss": "0.00129",
      "percentile": "0.0284"
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Add the corresponding\\ncleanup tags in _release_dev to ensure work isn\u0027t dispatched after\\nthe private struct is free\u0027d.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/s390/cio/vfio_ccw_ops.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"87d569cb35a541b31a184faf982540694d4c9a89\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"7492ca2d0c5d59add01e267be9f5a6eeb8076fd7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"b94b28c1f0fae53b2f2d6180ae6442c9a1558f67\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"e868ea8be0bc88c6982f48ecf3259d98afd884ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"dc47a98abe6714577a25224534dbd356051097a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"b7ae0f7993867d009a4b554fc1d6d451c10580a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"77f5e888d2e607a0b3141fb95091ad6ef1cca9a2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e5f84dbaea59b4f712dac428c337528b70e1c533\",\"lessThan\":\"79c60b2c61105368dcc8444eb45847e21734f7c4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/s390/cio/vfio_ccw_ops.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.153\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7492ca2d0c5d59add01e267be9f5a6eeb8076fd7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/77f5e888d2e607a0b3141fb95091ad6ef1cca9a2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79c60b2c61105368dcc8444eb45847e21734f7c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87d569cb35a541b31a184faf982540694d4c9a89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7ae0f7993867d009a4b554fc1d6d451c10580a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b94b28c1f0fae53b2f2d6180ae6442c9a1558f67\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc47a98abe6714577a25224534dbd356051097a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e868ea8be0bc88c6982f48ecf3259d98afd884ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T08:11:56+00:00",
      "cve": "CVE-2026-80553",
      "id": "CVE-2026-80553",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: s390/vfio_ccw: Cancel existing workqueues",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80553.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

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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.