Vulnerability-Lookup

GHSA-W33J-VHFX-HGQC

Vulnerability from github – Published: 2026-08-28 09:31 – Updated: 2026-08-28 09:31

Details

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

s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs

There is a wrong upper limit check for the domain value when an EP11 CPRB is processed for sending to a crypto card. This check is only active on custom device nodes but may lead to access heap memory behind perms->adm when an administrative CPRB is sent. Add correct limit (AP_DOMAINS = 256) checking to fix this.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80709"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-28T08:16:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Fix wrong domain value verification with EP11 CPRBs\n\nThere is a wrong upper limit check for the domain value when an EP11\nCPRB is processed for sending to a crypto card. This check is only\nactive on custom device nodes but may lead to access heap memory\nbehind perms-\u003eadm when an administrative CPRB is sent.\nAdd correct limit (AP_DOMAINS = 256) checking to fix this.",
  "id": "GHSA-w33j-vhfx-hgqc",
  "modified": "2026-08-28T09:31:50Z",
  "published": "2026-08-28T09:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80709"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80709 (GCVE-0-2026-80709)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:53 – Updated: 2026-08-29 06:22

Title

s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs There is a wrong upper limit check for the domain value when an EP11 CPRB is processed for sending to a crypto card. This check is only active on custom device nodes but may lead to access heap memory behind perms->adm when an administrative CPRB is sent. Add correct limit (AP_DOMAINS = 256) checking to fix this.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/4589f742718d0256e…
https://git.kernel.org/stable/c/b505dcc8307d64468…
https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1…
https://git.kernel.org/stable/c/672b12940e3f1336d…
https://git.kernel.org/stable/c/1223477ca88e2396e…
https://git.kernel.org/stable/c/983279d7f86ade73d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 4589f742718d0256ea6dd1f5a78be6e689bdb8aa (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < b505dcc8307d64468b463dfad45a03bf865c637e (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15 (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 672b12940e3f1336dfed5287412a71500adf2a76 (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 1223477ca88e2396eca440919d0ca8754df79bd5 (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 983279d7f86ade73db86f886e09172dd567031b5 (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4589f742718d0256ea6dd1f5a78be6e689bdb8aa",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "b505dcc8307d64468b463dfad45a03bf865c637e",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "672b12940e3f1336dfed5287412a71500adf2a76",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "1223477ca88e2396eca440919d0ca8754df79bd5",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "983279d7f86ade73db86f886e09172dd567031b5",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "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": "6.1.183",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Fix wrong domain value verification with EP11 CPRBs\n\nThere is a wrong upper limit check for the domain value when an EP11\nCPRB is processed for sending to a crypto card. This check is only\nactive on custom device nodes but may lead to access heap memory\nbehind perms-\u003eadm when an administrative CPRB is sent.\nAdd correct limit (AP_DOMAINS = 256) checking to fix this."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Reached only via ZSENDEP11CPRB ioctl on an s390 zcrypt custom zcdn character device (zcrypt_unlocked_ioctl -\u003e zsendep11cprb_ioctl -\u003e _zcrypt_send_ep11_cprb); no network, radio, or physical-bus entry path exists.\nAC:L - A local attacker with a permitted zcdn fd fully controls ep11_urb/CPRB target_id and the admin flag; domain values 256-65534 reliably trigger the flawed test_bit_inv() past perms-\u003eadm without races or conditions outside attacker control.\nPR:L - Exploitation requires local access to a custom zcdn node with ZSENDEP11CPRB enabled in ioctlmask; IBM Z/LinuxONE deployments routinely delegate such restricted crypto device access to non-root service accounts, not init-namespace root alone.\nUI:N - The attacker triggers the flaw by issuing ZSENDEP11CPRB with a crafted administrative EP11 CPRB from their own process; no separate victim action such as mounting a filesystem or opening a file is required.\nS:U - Impact is kernel heap out-of-bounds read and bypass of per-device admin-domain filtering within the host kernel address space; it does not cross a VM, IOMMU, or other changed security-authority boundary.\nC:H - Using domain 256-65534 with an admin CPRB makes test_bit_inv() index beyond the 256-bit perms-\u003eadm bitmap, reading adjacent kmalloc heap memory behind the zcdn_device allocation.\nI:H - If the out-of-bounds read observes a set bit, the admask admin-domain check passes and unauthorized EP11 administrative CPRBs can reach crypto control domains outside the device\u0027s intended permissions.\nA:H - Large crafted domain values make test_bit_inv() read far beyond the zcdn_device kmalloc object, which can access unmapped memory and provoke a kernel oops or panic during the ioctl path."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-29T06:22:25.717Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/4589f742718d0256ea6dd1f5a78be6e689bdb8aa"
        },
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          "url": "https://git.kernel.org/stable/c/b505dcc8307d64468b463dfad45a03bf865c637e"
        },
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          "url": "https://git.kernel.org/stable/c/13e53d6ae1c3b2ff1be75b9ef09be26f4ec3ce15"
        },
        {
          "url": "https://git.kernel.org/stable/c/672b12940e3f1336dfed5287412a71500adf2a76"
        },
        {
          "url": "https://git.kernel.org/stable/c/1223477ca88e2396eca440919d0ca8754df79bd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/983279d7f86ade73db86f886e09172dd567031b5"
        }
      ],
      "title": "s390/zcrypt: Fix wrong domain value verification with EP11 CPRBs",
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        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80709",
    "datePublished": "2026-08-28T06:53:09.439Z",
    "dateReserved": "2026-08-26T14:34:25.787Z",
    "dateUpdated": "2026-08-29T06:22:25.717Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "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.

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GHSA-W33J-VHFX-HGQC

CVE-2026-80709 (GCVE-0-2026-80709)

Tags

Sightings

Nomenclature