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s390/zcrypt: Fix buffer over-read in cca_cipher2protkey

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Fix buffer over-read in cca_cipher2protkey Add validation of both the actual key buffer size and token length fields in all the cca_check_sec*token() functions. Additionally check in cca_gencipherkey() for possible underflow with returned key size. The CCA token structures contain user-controlled len fields that were used in operations without proper validation against both the actual buffer size and minimum token structure size. An attacker could set this field larger than the actual buffer size, leading to reading beyond buffer boundaries. This may result in a kernel crash or exposure of memory via sending this as part of a request down to the crypto card. Also an attacker could have used a very small len value and thus enforce a buffer under-run which may produce similar effects as a over-read. So now a key must - key buf length must be at least sizeof the token struct - the key len field inside the token must fit into the range of sizeof key token struct ... key buf length

Announced Source revision 1
Original source ↗

CVE-2026-68453

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-68453

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd",
        "lessThan": "d0951ed366710a1a303b7cb2f8eb3d866cd68fc6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd",
        "lessThan": "353e442d18084b24fb3ede4e5adfca26b25f0e89",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd",
        "lessThan": "a57fd7fcdb63e2d5ceac78bbe825ec986062a9da",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd",
        "lessThan": "3b2abee2a678607ae27975bc6833785c2002df43",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd",
        "lessThan": "36b230835b8a008266aad22168ca52afacc8a58d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/s390/crypto/pkey_cca.c",
      "drivers/s390/crypto/zcrypt_ccamisc.c",
      "drivers/s390/crypto/zcrypt_ccamisc.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.4"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.4",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/s390/crypto/pkey_cca.c",
      "drivers/s390/crypto/zcrypt_ccamisc.c",
      "drivers/s390/crypto/zcrypt_ccamisc.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68453

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46484 · Revision 1
Added to Heist Feed
Publisher date
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