Vulnerability-Lookup

OESA-2026-3575 (CVE-2026-71225)

Vulnerability from osv_openeuler – Published: 2026-08-30 04:17 – Updated: 2026-08-30 04:17 – Source website

Summary

libkcapi security update

Details

The Linux kernel exports a Netlink interface of type AF_ALG to allow user space to utilize the kernel crypto API. libkcapi uses this Netlink interface and exports easy to use APIs so that a developer does not need to consider the low-level Netlink interface handling. The library does not implement any cipher algorithms. All consumer requests are sent to the kernel for processing. Results from the kernel crypto API are returned to the consumer via the library API.

Security Fix(es):

A flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.(CVE-2026-71225)

Severity

6.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-71225	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libkcapi-1.3.1-10.oe2203sp4.aarch64.rpm",
          "libkcapi-debuginfo-1.3.1-10.oe2203sp4.aarch64.rpm",
          "libkcapi-debugsource-1.3.1-10.oe2203sp4.aarch64.rpm",
          "libkcapi-devel-1.3.1-10.oe2203sp4.aarch64.rpm",
          "libkcapi-tests-1.3.1-10.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "libkcapi-help-1.3.1-10.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "libkcapi-1.3.1-10.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "libkcapi-1.3.1-10.oe2203sp4.x86_64.rpm",
          "libkcapi-debuginfo-1.3.1-10.oe2203sp4.x86_64.rpm",
          "libkcapi-debugsource-1.3.1-10.oe2203sp4.x86_64.rpm",
          "libkcapi-devel-1.3.1-10.oe2203sp4.x86_64.rpm",
          "libkcapi-tests-1.3.1-10.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "libkcapi",
        "purl": "pkg:rpm/openEuler/libkcapi\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.1-10.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "libkcapi-1.4.0-11.oe2403sp1.aarch64.rpm",
          "libkcapi-debuginfo-1.4.0-11.oe2403sp1.aarch64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp1.aarch64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp1.aarch64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "libkcapi-help-1.4.0-11.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "libkcapi-1.4.0-11.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libkcapi-1.4.0-11.oe2403sp1.x86_64.rpm",
          "libkcapi-debuginfo-1.4.0-11.oe2403sp1.x86_64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp1.x86_64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp1.x86_64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "libkcapi",
        "purl": "pkg:rpm/openEuler/libkcapi\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.0-11.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libkcapi-debuginfo-1.4.0-11.oe2403sp3.aarch64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp3.aarch64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp3.aarch64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp3.aarch64.rpm"
        ],
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          "libkcapi-help-1.4.0-11.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "libkcapi-1.4.0-11.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "libkcapi-1.4.0-11.oe2403sp3.x86_64.rpm",
          "libkcapi-debuginfo-1.4.0-11.oe2403sp3.x86_64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp3.x86_64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp3.x86_64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "libkcapi",
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      },
      "ranges": [
        {
          "events": [
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              "introduced": "0"
            },
            {
              "fixed": "1.4.0-11.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libkcapi-debuginfo-1.4.0-11.oe2403sp4.aarch64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp4.aarch64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp4.aarch64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp4.aarch64.rpm"
        ],
        "noarch": [
          "libkcapi-help-1.4.0-11.oe2403sp4.noarch.rpm"
        ],
        "src": [
          "libkcapi-1.4.0-11.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "libkcapi-1.4.0-11.oe2403sp4.x86_64.rpm",
          "libkcapi-debuginfo-1.4.0-11.oe2403sp4.x86_64.rpm",
          "libkcapi-debugsource-1.4.0-11.oe2403sp4.x86_64.rpm",
          "libkcapi-devel-1.4.0-11.oe2403sp4.x86_64.rpm",
          "libkcapi-tests-1.4.0-11.oe2403sp4.x86_64.rpm"
        ]
      },
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      },
      "ranges": [
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              "introduced": "0"
            },
            {
              "fixed": "1.4.0-11.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
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          "libkcapi-debuginfo-1.2.0-11.oe2003sp4.aarch64.rpm",
          "libkcapi-debugsource-1.2.0-11.oe2003sp4.aarch64.rpm",
          "libkcapi-devel-1.2.0-11.oe2003sp4.aarch64.rpm",
          "libkcapi-tests-1.2.0-11.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "libkcapi-help-1.2.0-11.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "libkcapi-1.2.0-11.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "libkcapi-1.2.0-11.oe2003sp4.x86_64.rpm",
          "libkcapi-debuginfo-1.2.0-11.oe2003sp4.x86_64.rpm",
          "libkcapi-debugsource-1.2.0-11.oe2003sp4.x86_64.rpm",
          "libkcapi-devel-1.2.0-11.oe2003sp4.x86_64.rpm",
          "libkcapi-tests-1.2.0-11.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "libkcapi",
        "purl": "pkg:rpm/openEuler/libkcapi\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.0-11.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "The Linux kernel exports a Netlink interface of type AF_ALG to allow user space to utilize the kernel crypto API. libkcapi uses this Netlink interface and exports easy to use APIs so that a developer does not need to consider the low-level Netlink interface handling. The library does not implement any cipher algorithms. All consumer requests are sent to the kernel for processing. Results from the kernel crypto API are returned to the consumer via the library API.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libkcapi. When performing one-shot symmetric cipher operations on large inputs (over 64 KiB) in stateful modes such as Counter (CTR) or Cipher Block Chaining (CBC), the library improperly reuses the Initialization Vector (IV) for each internal data chunk. A remote attacker could potentially exploit this by making an application that uses libkcapi process specially crafted large inputs. This can lead to a significant weakening of data confidentiality, as the repeated IV use can expose relationships in encrypted plaintext, and may also affect data integrity by causing incorrect cryptographic processing.(CVE-2026-71225)",
  "id": "OESA-2026-3575",
  "modified": "2026-08-30T04:17:56Z",
  "published": "2026-08-30T04:17:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3575"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-71225"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libkcapi security update",
  "upstream": [
    "CVE-2026-71225"
  ]
}

CVE-2026-71225 (GCVE-0-2026-71225)

Vulnerability from cvelistv5 – Published: 2026-08-05 12:16 – Updated: 2026-09-14 09:37

Title

Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries

Summary

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-05 14:20 UTC

CWE

CWE-330 - Use of Insufficiently Random Values

Assigner

redhat redhat root

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:56985	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:67265	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:67266	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:67267	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-71225	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2462011	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Stephan Muelle	libkcapi	Affected: 0.10.1 , < 1.5.1 (semver)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:1.5.1-1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:1.4.0-3.el8_10 , < * (rpm) cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:1.4.0-3.el9_8 , < * (rpm) cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat	Red Hat Hardened Images	Unaffected: 1.5.1-0.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-08-05 11:55

Credits

This issue was discovered by Found by AISLE in partnership with Red Hat.

Show details on NVD website

JSON

To clipboard

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    "datePublished": "2026-08-05T12:16:52.748Z",
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    "dateUpdated": "2026-09-14T09:37:54.137Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.