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    14 vulnerabilities by ChaN

    CVE-2026-6688 (GCVE-0-2026-6688)

    Vulnerability from nvd – Published: 2026-07-01 14:01 – Updated: 2026-07-01 15:06
    VLAI
    Title
    FatFs Buffer Overflow via Unbounded LFN Filename Copy
    Summary
    FatFs R0.16 and earlier contains a downstream-caller vulnerability pattern associated with FatFs long filename handling. With LFN enabled, fno.fname can be up to 255 characters; many callers copy it into short fixed buffers without bounds checks, causing overflow. This maps to CWE-120 (Buffer Copy without Checking Size of Input). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6687 (GCVE-0-2026-6687)

    Vulnerability from nvd – Published: 2026-07-01 13:57 – Updated: 2026-07-01 15:06
    VLAI
    Title
    FatFs Stack Buffer Overflow via Uncapped exFAT Label Length
    Summary
    FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-121 - Stack-based buffer overflow
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6686 (GCVE-0-2026-6686)

    Vulnerability from nvd – Published: 2026-07-01 13:55 – Updated: 2026-07-01 15:05
    VLAI
    Title
    FatFs Use of Uninitialized Clusters After Seek Past EOF
    Summary
    FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters. This maps to CWE-908 (Use of Uninitialized Resource). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (4.6, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-908 - Use of uninitialized resource
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6685 (GCVE-0-2026-6685)

    Vulnerability from nvd – Published: 2026-07-01 13:47 – Updated: 2026-07-01 15:26
    VLAI
    Title
    FatFs Integer Underflow in Dirty-Sector Cache Flush
    Summary
    FatFs R0.16 and earlier exhibits a stale dirty-cache skip via unsigned-subtraction wrap in f_read() / f_write() (fp->sect - sect < cc) during interleaved read/write on fragmented filesystems. This maps to CWE-191 (Integer Underflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H (6.1, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-191 - Integer underflow (wrap or wraparound)
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6684 (GCVE-0-2026-6684)

    Vulnerability from nvd – Published: 2026-07-01 13:45 – Updated: 2026-07-01 15:25
    VLAI
    Title
    FatFs Infinite Loop in GPT Partition Scan
    Summary
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    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-835 - Loop with unreachable exit condition ('infinite loop')
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , < R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6683 (GCVE-0-2026-6683)

    Vulnerability from nvd – Published: 2026-07-01 13:41 – Updated: 2026-07-01 15:24
    VLAI
    Title
    FatFs Divide-by-Zero in exFAT Sync
    Summary
    FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6682 (GCVE-0-2026-6682)

    Vulnerability from nvd – Published: 2026-07-01 13:36 – Updated: 2026-07-01 15:24
    VLAI
    Title
    FatFs Integer Overflow in FAT32 Volume Mount
    Summary
    In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
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    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-190 - Integer overflow or wraparound
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6688 (GCVE-0-2026-6688)

    Vulnerability from cvelistv5 – Published: 2026-07-01 14:01 – Updated: 2026-07-01 15:06
    VLAI
    Title
    FatFs Buffer Overflow via Unbounded LFN Filename Copy
    Summary
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    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-120 - Buffer Copy without Checking Size of Input
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6687 (GCVE-0-2026-6687)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:57 – Updated: 2026-07-01 15:06
    VLAI
    Title
    FatFs Stack Buffer Overflow via Uncapped exFAT Label Length
    Summary
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    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-121 - Stack-based buffer overflow
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6686 (GCVE-0-2026-6686)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:55 – Updated: 2026-07-01 15:05
    VLAI
    Title
    FatFs Use of Uninitialized Clusters After Seek Past EOF
    Summary
    FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters. This maps to CWE-908 (Use of Uninitialized Resource). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (4.6, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-908 - Use of uninitialized resource
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6685 (GCVE-0-2026-6685)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:47 – Updated: 2026-07-01 15:26
    VLAI
    Title
    FatFs Integer Underflow in Dirty-Sector Cache Flush
    Summary
    FatFs R0.16 and earlier exhibits a stale dirty-cache skip via unsigned-subtraction wrap in f_read() / f_write() (fp->sect - sect < cc) during interleaved read/write on fragmented filesystems. This maps to CWE-191 (Integer Underflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H (6.1, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-191 - Integer underflow (wrap or wraparound)
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6684 (GCVE-0-2026-6684)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:45 – Updated: 2026-07-01 15:25
    VLAI
    Title
    FatFs Infinite Loop in GPT Partition Scan
    Summary
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    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-835 - Loop with unreachable exit condition ('infinite loop')
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , < R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6683 (GCVE-0-2026-6683)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:41 – Updated: 2026-07-01 15:24
    VLAI
    Title
    FatFs Divide-by-Zero in exFAT Sync
    Summary
    FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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    CVE-2026-6682 (GCVE-0-2026-6682)

    Vulnerability from cvelistv5 – Published: 2026-07-01 13:36 – Updated: 2026-07-01 15:24
    VLAI
    Title
    FatFs Integer Overflow in FAT32 Volume Mount
    Summary
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    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-190 - Integer overflow or wraparound
    Assigner
    Impacted products
    Vendor Product Version
    ChaN FatFs Affected: 0 , ≤ R0.16 (custom)
    Create a notification for this product.
    Date Public
    2026-07-01 13:00
    Credits
    HD Moore of runZero, Inc. Tod Beardsley of runZero, Inc.
    Show details on NVD website

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        "assignerOrgId": "44488dab-36db-4358-99f9-bc116477f914",
        "assignerShortName": "runZero",
        "cveId": "CVE-2026-6682",
        "datePublished": "2026-07-01T13:36:59.935Z",
        "dateReserved": "2026-04-20T15:06:18.243Z",
        "dateUpdated": "2026-07-01T15:24:05.860Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }