Vulnerability-Lookup

GHSA-9VQH-HXM7-9FWM

Vulnerability from github – Published: 2026-08-27 06:31 – Updated: 2026-08-27 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Implement a crw lock

Unlike the channel_program struct, which covers synchronous I/O submissions and asynchronous interrupts, the CRW region relies exclusively on asynchronous events coming from hardware.

Implement a lock to manage the list of those payloads, to ensure they are read cohesively.

Severity

8.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80547"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T15:17:09Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Implement a crw lock\n\nUnlike the channel_program struct, which covers synchronous I/O\nsubmissions and asynchronous interrupts, the CRW region relies\nexclusively on asynchronous events coming from hardware.\n\nImplement a lock to manage the list of those payloads, to ensure\nthey are read cohesively.",
  "id": "GHSA-9vqh-hxm7-9fwm",
  "modified": "2026-08-27T15:31:32Z",
  "published": "2026-08-27T06:31:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80547"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0edd222730a9d7ec98368aaf1d40ee2d8d862e61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3c94d4179bcc19e01b28db634c07a58b28116209"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49fa26b0df009dc1f420980bd71780e70615b83b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7902be374cbfc11c3435e1e87bf22195bf06a558"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3d60ae24183eee352c8e87a0ff94c97cd87f156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-80547 (GCVE-0-2026-80547)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-27 12:40

Title

s390/vfio_ccw: Implement a crw lock

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Implement a crw lock Unlike the channel_program struct, which covers synchronous I/O submissions and asynchronous interrupts, the CRW region relies exclusively on asynchronous events coming from hardware. Implement a lock to manage the list of those payloads, to ensure they are read cohesively.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/3c94d4179bcc19e01…
https://git.kernel.org/stable/c/0edd222730a9d7ec9…
https://git.kernel.org/stable/c/a3d60ae24183eee35…
https://git.kernel.org/stable/c/49fa26b0df009dc1f…
https://git.kernel.org/stable/c/7902be374cbfc11c3…
https://git.kernel.org/stable/c/c76c4ee72bfc3824f…
https://git.kernel.org/stable/c/16b0798024c0e9117…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < 3c94d4179bcc19e01b28db634c07a58b28116209 (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < 0edd222730a9d7ec98368aaf1d40ee2d8d862e61 (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < a3d60ae24183eee352c8e87a0ff94c97cd87f156 (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < 49fa26b0df009dc1f420980bd71780e70615b83b (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < 7902be374cbfc11c3435e1e87bf22195bf06a558 (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9 (git) Affected: 3f02cb2fd9d2d9e8762102886e3e4b51285797ee , < 16b0798024c0e9117e395829ddbbe70981c79d9c (git)
Linux	Linux	Affected: 5.8 Unaffected: 0 , < 5.8 (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.154 , ≤ 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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/cio/vfio_ccw_chp.c",
            "drivers/s390/cio/vfio_ccw_drv.c",
            "drivers/s390/cio/vfio_ccw_ops.c",
            "drivers/s390/cio/vfio_ccw_private.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "3c94d4179bcc19e01b28db634c07a58b28116209",
              "status": "affected",
              "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
              "versionType": "git"
            },
            {
              "lessThan": "49fa26b0df009dc1f420980bd71780e70615b83b",
              "status": "affected",
              "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee",
              "versionType": "git"
            },
            {
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              "versionType": "git"
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              "versionType": "git"
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          "product": "Linux",
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            "drivers/s390/cio/vfio_ccw_drv.c",
            "drivers/s390/cio/vfio_ccw_ops.c",
            "drivers/s390/cio/vfio_ccw_private.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.185",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.154",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.218",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.185",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.154",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.105",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.8",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Implement a crw lock\n\nUnlike the channel_program struct, which covers synchronous I/O\nsubmissions and asynchronous interrupts, the CRW region relies\nexclusively on asynchronous events coming from hardware.\n\nImplement a lock to manage the list of those payloads, to ensure\nthey are read cohesively."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "baseScore": 8.8,
            "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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          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The flaw is reached only via local VFIO mediated-device access (read/ioctl on /dev/vfio/* device fds) to the CCW CRW region; vfio-ccw has no network, Bluetooth, or physical-bus packet entry point.\nAC:L - The attacker controls CRW region reads and can retry concurrently while channel-path events queue CRWs via vfio_ccw_chp_event(); this user-versus-hardware/workqueue list race is winnable without conditions outside attacker influence.\nPR:L - Triggering requires an opened vfio-ccw mdev fd (typical QEMU/libvirt VM operator or delegated /dev/vfio holder on IBM Z passthrough hosts), not init-namespace root; admin creates the mdev but exploitation needs only that VFIO client access.\nUI:N - No separate victim action is required; once vfio-ccw passthrough is configured, the attacker repeatedly reads the CRW region while guest/channel I/O generates asynchronous path events without needing another user to interact.\nS:C - On IBM Z/LinuxONE, vfio-ccw passes DASD subchannels into KVM guests; guest-driven channel activity causes host-side CRW queuing while the VFIO client reads the CRW region, corrupting hypervisor kernel memory outside the VM security boundary.\nC:H - Unsynchronized list_del/list_add/kfree on kmalloc vfio_ccw_crw objects is a use-after-free/list-corruption primitive; per kernel guidance this enables attacker-influenced heap reuse and arbitrary kernel memory disclosure.\nI:H - Corrupted list pointers and freed CRW entries allow heap-sprayable arbitrary writes and control-flow hijack beyond a simple crash, matching kernel guidance for use-after-free and memory corruption bugs.\nA:H - Concurrent unsynchronized list manipulation can immediately oops or panic the host kernel via invalid list operations or double-free, and successful exploitation can hang or crash the entire system."
            }
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        "dateUpdated": "2026-08-27T12:40:07.162Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c"
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      "title": "s390/vfio_ccw: Implement a crw lock",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80547",
    "datePublished": "2026-08-26T14:37:18.159Z",
    "dateReserved": "2026-08-26T14:34:25.766Z",
    "dateUpdated": "2026-08-27T12:40:07.162Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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