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    6 vulnerabilities found for libkcapi by Stephan Muelle

    CVE-2026-71227 (GCVE-0-2026-71227)

    Vulnerability from nvd – Published: 2026-08-05 12:42 – Updated: 2026-08-10 08:59
    VLAI
    Title
    Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return
    Summary
    A flaw was found in libkcapi. A local attacker can influence an application that uses the Asynchronous Input/Output (AIO) interface. By reusing an AIO-enabled handle after a prior completion error, the _kcapi_aio_read_all() function can enter a non-terminating wait loop. This can lead to a persistent denial of service, making the affected application or thread unresponsive.
    Severity
    5.1 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
    Assigner
    References
    URL Tags
    https://access.redhat.com/security/cve/CVE-2026-71227 vdb-entryx_refsource_REDHAT
    https://bugzilla.redhat.com/show_bug.cgi?id=2462867 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-05 12:29
    Credits
    This issue was discovered by Found by AISLE in partnership with Red Hat.
    Show details on NVD website
    To clipboard 

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    CVE-2026-71226 (GCVE-0-2026-71226)

    Vulnerability from nvd – Published: 2026-08-05 12:37 – Updated: 2026-08-10 08:45
    VLAI
    Title
    Libkcapi: memory corruption via uncanceled aio requests on error in libkcapi's one-shot aio path
    Summary
    Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.
    Severity
    7.3 (High)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    URL Tags
    https://access.redhat.com/security/cve/CVE-2026-71226 vdb-entryx_refsource_REDHAT
    https://bugzilla.redhat.com/show_bug.cgi?id=2462114 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-05 12:22
    Credits
    This issue was discovered by Found by AISLE in partnership with Red Hat.
    Show details on NVD website
    To clipboard 

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

    Vulnerability from nvd – Published: 2026-08-05 12:16 – Updated: 2026-08-10 08:25
    VLAI
    Title
    Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries
    Summary
    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.
    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 (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    URL Tags
    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
    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
    To clipboard 

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    CVE-2026-71227 (GCVE-0-2026-71227)

    Vulnerability from cvelistv5 – Published: 2026-08-05 12:42 – Updated: 2026-08-10 08:59
    VLAI
    Title
    Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return
    Summary
    A flaw was found in libkcapi. A local attacker can influence an application that uses the Asynchronous Input/Output (AIO) interface. By reusing an AIO-enabled handle after a prior completion error, the _kcapi_aio_read_all() function can enter a non-terminating wait loop. This can lead to a persistent denial of service, making the affected application or thread unresponsive.
    Severity
    5.1 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
    Assigner
    References
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    https://bugzilla.redhat.com/show_bug.cgi?id=2462867 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-05 12:29
    Credits
    This issue was discovered by Found by AISLE in partnership with Red Hat.
    Show details on NVD website
    To clipboard 

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    CVE-2026-71226 (GCVE-0-2026-71226)

    Vulnerability from cvelistv5 – Published: 2026-08-05 12:37 – Updated: 2026-08-10 08:45
    VLAI
    Title
    Libkcapi: memory corruption via uncanceled aio requests on error in libkcapi's one-shot aio path
    Summary
    Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.
    Severity
    7.3 (High)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
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    https://access.redhat.com/security/cve/CVE-2026-71226 vdb-entryx_refsource_REDHAT
    https://bugzilla.redhat.com/show_bug.cgi?id=2462114 issue-trackingx_refsource_REDHAT
    Impacted products
    Date Public
    2026-08-05 12:22
    Credits
    This issue was discovered by Found by AISLE in partnership with Red Hat.
    Show details on NVD website
    To clipboard 

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

    Vulnerability from cvelistv5 – Published: 2026-08-05 12:16 – Updated: 2026-08-10 08:25
    VLAI
    Title
    Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries
    Summary
    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.
    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 (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    URL Tags
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    https://bugzilla.redhat.com/show_bug.cgi?id=2462011 issue-trackingx_refsource_REDHAT
    Impacted products
    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
    To clipboard 

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          "url": "https://access.redhat.com/security/cve/CVE-2026-71225"
        },
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          "name": "RHBZ#2462011",
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          "time": "2026-04-26T18:00:31.000Z",
          "value": "Reported to Red Hat."
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          "lang": "en",
          "time": "2026-08-05T11:55:38.243Z",
          "value": "Made public."
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      "title": "Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries",
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          "lang": "en",
          "value": "To mitigate this issue, applications using `libkcapi` should avoid the one-shot symmetric cipher APIs for inputs exceeding 64 KiB when continuous-message semantics are critical. Instead, prefer the streaming interface for processing large messages, or ensure one-shot inputs remain below the internal chunking threshold to guarantee the IV is applied consistently throughout the operation."
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