Vulnerability-Lookup

GHSA-4FV3-CQPG-5V3H

Vulnerability from github – Published: 2026-08-13 15:34 – Updated: 2026-08-14 00:31

Details

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

s390/zcrypt: Validate length for CCA ECC private key requests

cca_ecc2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68451"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T15:19:57Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Validate length for CCA ECC private key requests\n\ncca_ecc2protkey() derives the copy length for the CPRB parameter\nblock directly from the length field in the key token. Reject the\nrequest early if the token length exceeds the available space in the\nparameter block.",
  "id": "GHSA-4fv3-cqpg-5v3h",
  "modified": "2026-08-14T00:31:59Z",
  "published": "2026-08-13T15:34:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68451"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/013a4484f061a2b41f052e25c0015203287e63f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fa3e9435a13c335efb63fb4f4e77531a0031159"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9ae0f6dd45c3ccc1d69363f7aea8af179122730"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68451 (GCVE-0-2026-68451)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:59 – Updated: 2026-08-13 22:45

Title

s390/zcrypt: Validate length for CCA ECC private key requests

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA ECC private key requests cca_ecc2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.

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

References

5 references

URL	Tags
https://git.kernel.org/stable/c/dd25bd9b0f3684980…
https://git.kernel.org/stable/c/ecc3b8691c1935f9f…
https://git.kernel.org/stable/c/013a4484f061a2b41…
https://git.kernel.org/stable/c/8fa3e9435a13c335e…
https://git.kernel.org/stable/c/a9ae0f6dd45c3ccc1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 013a4484f061a2b41f052e25c0015203287e63f1 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < 8fa3e9435a13c335efb63fb4f4e77531a0031159 (git) Affected: fa6999e326fe7851ecbd572b8cb9be8e930ebf41 , < a9ae0f6dd45c3ccc1d69363f7aea8af179122730 (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (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-rc6 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_ccamisc.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e",
              "status": "affected",
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              "versionType": "git"
            },
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              "lessThan": "ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5",
              "status": "affected",
              "version": "fa6999e326fe7851ecbd572b8cb9be8e930ebf41",
              "versionType": "git"
            },
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              "lessThan": "013a4484f061a2b41f052e25c0015203287e63f1",
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              "versionType": "git"
            },
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_ccamisc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "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-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "5.10",
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                },
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                },
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                }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Validate length for CCA ECC private key requests\n\ncca_ecc2protkey() derives the copy length for the CPRB parameter\nblock directly from the length field in the key token. Reject the\nrequest early if the token length exceeds the available space in the\nparameter block."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
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            "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 - The bug is reached through the `/dev/pkey` misc device via the PKEY_KBLOB2PROTK/PROTK2/PROTK3 ioctls, requiring local access to the s390 system; there is no remote or network-facing path into cca_ecc2protkey().\nAC:L - The attacker fully controls both the overflow length and the overflowing bytes by crafting the ECC key token\u0027s `len` field and blob contents, and the memcpy executes deterministically on every call with no race, timing, or layout precondition.\nPR:L - The pkey misc device is registered with mode 0666 and pkey_unlocked_ioctl performs no capability check, so any unprivileged local user (or a container/sandbox process with the node visible) can issue the ioctl.\nUI:N - The attacker triggers the overflow entirely from its own ioctl call; no action by another user or administrator is needed.\nS:U - The heap corruption occurs in kernel memory within the same security authority; no VM, IOMMU, or other trust boundary is crossed by the overflow itself.\nC:H - The controlled slab overflow can overwrite adjacent kernel objects (pointers, lengths, credentials) with attacker-chosen data, which is readily leveraged into arbitrary kernel memory disclosure, including protected/secure key material handled by this subsystem.\nI:H - memcpy() writes up to ~7 KB of fully attacker-controlled data past a kmalloc\u0027d CPRB buffer, giving a classic controlled heap out-of-bounds write usable for corrupting neighbouring slab objects and achieving privilege escalation or control-flow hijack.\nA:H - Even without reliable exploitation, the oversized memcpy smashes the slab and neighbouring allocations, causing memory corruption, SLUB/redzone BUG detonations, oops or kernel panic, repeatedly triggerable by an unprivileged user."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T22:45:15.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e"
        },
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        },
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/a9ae0f6dd45c3ccc1d69363f7aea8af179122730"
        }
      ],
      "title": "s390/zcrypt: Validate length for CCA ECC private key requests",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68451",
    "datePublished": "2026-08-13T13:59:53.674Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-13T22:45:15.498Z",
    "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.

Action not permitted

GHSA-4FV3-CQPG-5V3H

CVE-2026-68451 (GCVE-0-2026-68451)

Tags

Sightings

Nomenclature