Vulnerability-Lookup

SUSE-SU-2026:21593-1

Vulnerability from csaf_suse - Published: 2026-05-07 09:54 - Updated: 2026-09-16 19:47

Summary

Security update for openCryptoki

Severity

Moderate

Notes

Title of the patch: Security update for openCryptoki

Description of the patch: This update for openCryptoki fixes the following issues Security issue: - CVE-2026-40253: Updated fix for malformed BER-encoded cryptographic objects (bsc#1262283). Non security issue: - Refactored .spec file to fully support transactional and immutable operating systems (jsc#PED-14609): * Migrated user and group creation (pkcs11, pkcsslotd) from imperative %pre shell commands to declarative systemd-sysusers configuration. * Replaced manual /var directory tracking and %ghost directives with comprehensive systemd-tmpfiles configurations. * Implemented dynamic, architecture-specific tmpfiles.d generation to properly provision hardware-specific token directories (e.g., ccatok, ep11tok, lite, and HSM_MK_CHANGE). - Fixed permissions for /run/opencryptoki within tmpfiles.d to ensure the daemon can successfully drop privileges and bind its communication socket. * Moved 32-bit and 64-bit shared library symlink creation (such as PKCS11_API.so, stdll, and methods) from %post scriptlets into the %install phase, ensuring they are correctly packaged and tracked on the read-only /usr partition. * Removed legacy /etc/pkcs11 bash migration logic from %post, replacing it with a declarative tmpfiles.d symlink rule. - Cleaned up scriptlets to only execute transaction-safe macros (such as ldconfig and systemd service handlers).

Patchnames: SUSE-SL-Micro-6.2-718

CVE-2026-40253

6.8 (Medium)


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

Affected products

Recommended 1 product

Product	Identifier	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.2:openCryptoki-3.26.0-160000.2.1.s390x		—	Vendor Fix

Threats

Impact moderate

References

10 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-updates/2026…	self
https://bugzilla.suse.com/1262283	self
https://bugzilla.suse.com/1263819	self
https://www.suse.com/security/cve/CVE-2026-40253/	self
https://www.suse.com/security/cve/CVE-2026-40253	external
https://bugzilla.suse.com/1262283	external
https://bugzilla.suse.com/1263819	external

JSON

To clipboard

{
  "document": {
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      "text": "moderate"
    },
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        "text": "This update for openCryptoki fixes the following issues\n\nSecurity issue:\n\n- CVE-2026-40253: Updated fix for malformed BER-encoded cryptographic objects\n  (bsc#1262283).\n\nNon security issue:\n\n- Refactored .spec file to fully support transactional and immutable operating systems\n (jsc#PED-14609):\n * Migrated user and group creation (pkcs11, pkcsslotd) from imperative %pre shell commands to\n declarative systemd-sysusers configuration.\n * Replaced manual /var directory tracking and %ghost directives with\n comprehensive systemd-tmpfiles configurations.\n * Implemented dynamic, architecture-specific tmpfiles.d generation to properly provision\n hardware-specific token directories (e.g., ccatok, ep11tok, lite, and HSM_MK_CHANGE).\n- Fixed permissions for /run/opencryptoki within tmpfiles.d to ensure the\n daemon can successfully drop privileges and bind its communication socket.\n * Moved 32-bit and 64-bit shared library symlink creation (such as PKCS11_API.so, stdll, and methods)\n from %post scriptlets into the %install phase,\n ensuring they are correctly packaged and tracked on the read-only /usr partition.\n * Removed legacy /etc/pkcs11 bash migration logic from %post,\n replacing it with a declarative tmpfiles.d symlink rule.\n- Cleaned up scriptlets to only execute transaction-safe macros\n (such as ldconfig and systemd service handlers).\n",
        "title": "Description of the patch"
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        "text": "SUSE-SL-Micro-6.2-718",
        "title": "Patchnames"
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        "category": "self",
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        "url": "https://bugzilla.suse.com/1262283"
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    "title": "Security update for openCryptoki",
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                "category": "product_version",
                "name": "openCryptoki-3.26.0-160000.2.1.s390x",
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                  "name": "openCryptoki-3.26.0-160000.2.1.s390x",
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  "vulnerabilities": [
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          "text": "https://www.suse.com/security/cve/CVE-2026-40253"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.",
          "title": "CVE description"
        }
      ],
      "product_status": {
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          "SUSE Linux Micro 6.2:openCryptoki-3.26.0-160000.2.1.s390x"
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      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-40253",
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        },
        {
          "category": "external",
          "summary": "SUSE Bug 1262283 for CVE-2026-40253",
          "url": "https://bugzilla.suse.com/1262283"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1263819 for CVE-2026-40253",
          "url": "https://bugzilla.suse.com/1263819"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "SUSE Linux Micro 6.2:openCryptoki-3.26.0-160000.2.1.s390x"
          ]
        }
      ],
      "scores": [
        {
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            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "SUSE Linux Micro 6.2:openCryptoki-3.26.0-160000.2.1.s390x"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-05-07T09:54:18Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-40253"
    }
  ]
}

CVE-2026-40253 (GCVE-0-2026-40253)

Vulnerability from cvelistv5 – Published: 2026-04-16 22:04 – Updated: 2026-04-17 12:27

Title

openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c

Summary

openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.

Severity

6.8 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-17 12:27 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/opencryptoki/opencryptoki/secu…	x_refsource_CONFIRM
https://github.com/opencryptoki/opencryptoki/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
opencryptoki	opencryptoki	Affected: <= 3.26.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40253",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-17T12:27:37.623084Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-17T12:27:41.682Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/opencryptoki/opencryptoki/security/advisories/GHSA-c9cf-6vr4-wfxm"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "opencryptoki",
          "vendor": "opencryptoki",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 3.26.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-16T22:04:44.005Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/opencryptoki/opencryptoki/security/advisories/GHSA-c9cf-6vr4-wfxm",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/opencryptoki/opencryptoki/security/advisories/GHSA-c9cf-6vr4-wfxm"
        },
        {
          "name": "https://github.com/opencryptoki/opencryptoki/commit/ed378f463ef73364c89feb0fc923f4dc867332a3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/opencryptoki/opencryptoki/commit/ed378f463ef73364c89feb0fc923f4dc867332a3"
        }
      ],
      "source": {
        "advisory": "GHSA-c9cf-6vr4-wfxm",
        "discovery": "UNKNOWN"
      },
      "title": "openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40253",
    "datePublished": "2026-04-16T22:04:44.005Z",
    "dateReserved": "2026-04-10T17:31:45.786Z",
    "dateUpdated": "2026-04-17T12:27:41.682Z",
    "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.

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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SUSE-SU-2026:21593-1

CVE-2026-40253 (GCVE-0-2026-40253)

Tags

Sightings

Nomenclature

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