CVE-2026-68452 (GCVE-0-2026-68452)

Vulnerability from cvelistv5 – Published: 2026-08-13 13:59 – Updated: 2026-08-19 16:35
VLAI
Title
s390/zcrypt: Validate length for CCA AES cipher key requests
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA AES cipher key requests cca_cipher2protkey() 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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < be037204e4f595e4bd2159acda146677a1dc6342 (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 4e500ecb6704d879f9c2417c2ed6faba595015ca (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 7f9e5a3dbb14a9b321a1dfa30390402c673f82dc (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 406b317ea2b501f6f5eca1264293c9399a73a778 (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 4fc46deceda076d429ef3fab2ccf8d96629ebd23 (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < ad93a1f1a45652478c0cf4eb029114e03af57f3b (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 3859f630b674801a00bca39bc451f52288591f65 (git)
Affected: 4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd , < 06afe425d5283b9764303de47f554da5a808ce8a (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (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)
guessed Create a notification for this product.
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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_ccamisc.c"
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              "version": "7.1.8",
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
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                {
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                  "versionStartIncluding": "5.4",
                  "vulnerable": true
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                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Validate length for CCA AES cipher key requests\n\ncca_cipher2protkey() 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": [
        {
          "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 - The bug is reached through an ioctl (PKEY_KBLOB2PROTK2/3) on the /dev/pkey character device, requiring local access to the s390 system; there is no remote or adjacent-network path to cca_cipher2protkey().\nAC:L - The overflow is fully deterministic: the attacker sets the token\u0027s len field to any value up to the 8192-byte ioctl limit and the memcpy into the 512-byte parameter block happens unconditionally, before any crypto card interaction, with no race or unknown state involved.\nPR:L - The pkey misc device is registered with .mode = 0666 and neither pkey_api.c, pkey_base.c nor pkey_cca.c performs any capable()/CAP_* check, so any unprivileged local user can open it and issue the key-to-protkey ioctl.\nUI:N - The attacker triggers the overflow entirely on its own by issuing the ioctl with a crafted CCA AES cipher key token; no victim action or cooperation is needed.\nS:U - The heap corruption occurs in kernel slab memory managed by the same kernel security authority as the calling process; no VM, IOMMU or sandbox boundary is crossed.\nC:H - The controlled slab overflow (up to ~7.6 KB past a kmalloc-2k object) lets the attacker overwrite adjacent kernel objects, and the corrupted CPRB/reply buffer is subsequently parsed and partially copied back to userspace, giving a path to disclosing arbitrary kernel memory.\nI:H - memcpy() writes attacker-chosen token bytes far beyond the 512-byte parameter block, an out-of-bounds heap write with attacker-controlled length and contents, which is a classic primitive for corrupting neighbouring slab objects and hijacking control flow.\nA:H - Overwriting several kilobytes of adjacent slab memory reliably corrupts unrelated kernel objects and slab metadata, causing oopses or a panic; the ioctl can be repeated at will by any local user."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:50.661Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://git.kernel.org/stable/c/4e500ecb6704d879f9c2417c2ed6faba595015ca"
        },
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          "url": "https://git.kernel.org/stable/c/7f9e5a3dbb14a9b321a1dfa30390402c673f82dc"
        },
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          "url": "https://git.kernel.org/stable/c/406b317ea2b501f6f5eca1264293c9399a73a778"
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        },
        {
          "url": "https://git.kernel.org/stable/c/06afe425d5283b9764303de47f554da5a808ce8a"
        }
      ],
      "title": "s390/zcrypt: Validate length for CCA AES cipher key requests",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68452",
    "datePublished": "2026-08-13T13:59:54.840Z",
    "dateReserved": "2026-07-30T09:28:09.395Z",
    "dateUpdated": "2026-08-19T16:35:50.661Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-08-24",
      "epss": "0.00129",
      "percentile": "0.028"
    },
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      "cve": "CVE-2026-68452",
      "id": "msrc_CVE-2026-68452",
      "initial_release_date": "2026-08-14T19:14:17.000Z",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "s390/zcrypt: Validate length for CCA AES cipher key requests",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-68452.json",
      "version": "3"
    },
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Reject the\\nrequest early if the token length exceeds the available space in the\\nparameter block.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/s390/crypto/zcrypt_ccamisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"be037204e4f595e4bd2159acda146677a1dc6342\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"4e500ecb6704d879f9c2417c2ed6faba595015ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"7f9e5a3dbb14a9b321a1dfa30390402c673f82dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"406b317ea2b501f6f5eca1264293c9399a73a778\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"4fc46deceda076d429ef3fab2ccf8d96629ebd23\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"ad93a1f1a45652478c0cf4eb029114e03af57f3b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"3859f630b674801a00bca39bc451f52288591f65\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd\",\"lessThan\":\"06afe425d5283b9764303de47f554da5a808ce8a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/s390/crypto/zcrypt_ccamisc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"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:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/06afe425d5283b9764303de47f554da5a808ce8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3859f630b674801a00bca39bc451f52288591f65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/406b317ea2b501f6f5eca1264293c9399a73a778\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4e500ecb6704d879f9c2417c2ed6faba595015ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4fc46deceda076d429ef3fab2ccf8d96629ebd23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f9e5a3dbb14a9b321a1dfa30390402c673f82dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad93a1f1a45652478c0cf4eb029114e03af57f3b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be037204e4f595e4bd2159acda146677a1dc6342\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:29:10+00:00",
      "cve": "CVE-2026-68452",
      "id": "CVE-2026-68452",
      "initial_release_date": "2026-08-13T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: s390/zcrypt: Validate length for CCA AES cipher key requests",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68452.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.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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