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CVE-2026-80550 (GCVE-0-2026-80550)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 05:01
VLAI
Title
s390/vfio_ccw: Fix out of bounds check on CCW array
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccwchain_calc_length() counts the number of channel command words (CCWs) that are chained together in a single channel program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs. The loop itself is "do..while (count < 257)", and while the logic in is_cpa_within_range() correctly adjusts between the 0-index array of CCWs and the count of CCWs starting at 1, this means it would look at a possible 257th CCW before ending the loop and (correctly) returning an error. Fix this by restructuring the loop to break as soon as 256 CCWs (thus indexes 0-255) are examined, without looking at memory outside the range.
Severity
7.9 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < 0282fb1c4b638eecfe2cc558092c460911d8f7e2 (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < 907adc667d902fafbdb2d740d57b55bd025dc4cd (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3 (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < af3f80ca4c8b17f20f9e588def076288fdb49e65 (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < 499a8a66b1598bfab97182aed15e0f1646074a3d (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < d5d096cd9369e986d4e5153baa86b8b35c283e09 (git)
Affected: 0a19e61e6d4c6192077ead760ba0a2d350987d4c , < a005b7f1a491ffda61bff0fd0f6548f8986fb977 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 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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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Fix out of bounds check on CCW array\n\nThe routine ccwchain_calc_length() counts the number of channel\ncommand words (CCWs) that are chained together in a single channel\nprogram, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.\n\nThe loop itself is \"do..while (count \u003c 257)\", and while the logic in\nis_cpa_within_range() correctly adjusts between the 0-index array of\nCCWs and the count of CCWs starting at 1, this means it would look\nat a possible 257th CCW before ending the loop and (correctly)\nreturning an error.\n\nFix this by restructuring the loop to break as soon as 256 CCWs\n(thus indexes 0-255) are examined, without looking at memory\noutside the range."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only via local VFIO-ccw mediated-device write() on the I/O region (guest channel program relayed by QEMU into fsm_io_request\u2192cp_init\u2192ccwchain_calc_length); vfio-ccw has no network, adjacent-radio, or physical-bus entry point.\nAC:L - An attacker fully controls guest channel program content and can reliably submit 256 command-chained CCWs so ccwchain_calc_length() reaches the 257th iteration; no race, special timing, or uncontrollable heap layout is required beyond crafting the CCW chain.\nPR:N - A malicious KVM guest with an assigned vfio-ccw mediated subchannel needs no host credentials or capabilities; it triggers the bug by issuing normal guest I/O that QEMU forwards through VFIO, without init-namespace root or admin setup privileges at exploit time.\nUI:N - Exploitation requires only the attacker\u0027s own channel program submission through VFIO passthrough I/O once the device is assigned; no separate victim mount, click, or other user action is needed.\nS:C - Guest-supplied channel programs are parsed in the host kernel cp_init() path during vfio-ccw device passthrough on IBM Z/LinuxONE, so the out-of-bounds read crosses the guest-to-host VFIO virtualization boundary and can compromise hypervisor memory outside the VM security scope.\nC:H - ccwchain_calc_length() reads one struct ccw1 (8 bytes) past the 256-element guest_cp kmalloc buffer when all CCWs are chained, constituting a kernel heap out-of-bounds read of adjacent slab memory that per kernel guidance enables information disclosure primitives.\nI:N - The vulnerability is a single out-of-bounds read used only for chain/TIC validation before returning -EINVAL; it performs no out-of-bounds write and does not modify host or guest data, channel program state, or kernel control structures on the error path.\nA:L - The out-of-bounds read typically does not crash production kernels because the access stays within the same kmalloc slab page, but KASAN-instrumented or hardened builds can detect it and fault; availability impact is limited rather than a reliable host panic."
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          "url": "https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2"
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          "url": "https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd"
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    "dateReserved": "2026-08-26T14:34:25.766Z",
    "dateUpdated": "2026-08-27T05:01:38.029Z",
    "state": "PUBLISHED"
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      "version": "1"
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CCWs\\n(thus indexes 0-255) are examined, without looking at memory\\noutside the range.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/s390/cio/vfio_ccw_cp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"0282fb1c4b638eecfe2cc558092c460911d8f7e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"907adc667d902fafbdb2d740d57b55bd025dc4cd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"af3f80ca4c8b17f20f9e588def076288fdb49e65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"499a8a66b1598bfab97182aed15e0f1646074a3d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"4c2e1d359d7a2b82cdf3254e4e480af9417f99fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"d5d096cd9369e986d4e5153baa86b8b35c283e09\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0a19e61e6d4c6192077ead760ba0a2d350987d4c\",\"lessThan\":\"a005b7f1a491ffda61bff0fd0f6548f8986fb977\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/s390/cio/vfio_ccw_cp.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\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.184\",\"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:N/UI:N/S:C/C:H/I:N/A:L\",\"baseScore\":7.9,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":2.5,\"impactScore\":4.7}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0282fb1c4b638eecfe2cc558092c460911d8f7e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/499a8a66b1598bfab97182aed15e0f1646074a3d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4c2e1d359d7a2b82cdf3254e4e480af9417f99fb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/907adc667d902fafbdb2d740d57b55bd025dc4cd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a005b7f1a491ffda61bff0fd0f6548f8986fb977\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af3f80ca4c8b17f20f9e588def076288fdb49e65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5d096cd9369e986d4e5153baa86b8b35c283e09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T10:07:05+00:00",
      "cve": "CVE-2026-80550",
      "id": "CVE-2026-80550",
      "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: Fix out of bounds check on CCW array",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80550.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:11:45Z",
      "cve": "CVE-2026-80550",
      "id": "CVE-2026-80550",
      "initial_release_date": "2026-08-27T00:12:06Z",
      "product_status:known_affected": "347",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80550",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80550.json",
      "version": "7"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.