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      "text": "High"
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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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          "date": "2021-01-01T00:00:00Z",
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    {
      "cve": "CVE-2021-4439",
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        "name": "Improper Validation of Array Index"
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      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nisdn: cpai: check ctr->cnr to avoid array index out of bound\n\nThe cmtp_add_connection() would add a cmtp session to a controller\nand run a kernel thread to process cmtp.\n\n\t__module_get(THIS_MODULE);\n\tsession->task = kthread_run(cmtp_session, session, \"kcmtpd_ctr_%d\",\n\t\t\t\t\t\t\t\tsession->num);\n\nDuring this process, the kernel thread would call detach_capi_ctr()\nto detach a register controller. if the controller\nwas not attached yet, detach_capi_ctr() would\ntrigger an array-index-out-bounds bug.\n\n[   46.866069][ T6479] UBSAN: array-index-out-of-bounds in\ndrivers/isdn/capi/kcapi.c:483:21\n[   46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]'\n[   46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted\n5.15.0-rc2+ #8\n[   46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX,\n1996), BIOS 1.14.0-2 04/01/2014\n[   46.870107][ T6479] Call Trace:\n[   46.870473][ T6479]  dump_stack_lvl+0x57/0x7d\n[   46.870974][ T6479]  ubsan_epilogue+0x5/0x40\n[   46.871458][ T6479]  __ubsan_handle_out_of_bounds.cold+0x43/0x48\n[   46.872135][ T6479]  detach_capi_ctr+0x64/0xc0\n[   46.872639][ T6479]  cmtp_session+0x5c8/0x5d0\n[   46.873131][ T6479]  ? __init_waitqueue_head+0x60/0x60\n[   46.873712][ T6479]  ? cmtp_add_msgpart+0x120/0x120\n[   46.874256][ T6479]  kthread+0x147/0x170\n[   46.874709][ T6479]  ? set_kthread_struct+0x40/0x40\n[   46.875248][ T6479]  ret_from_fork+0x1f/0x30\n[   46.875773][ T6479]",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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        ],
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-4439"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d",
          "url": "https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a",
          "url": "https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54",
          "url": "https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a",
          "url": "https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594",
          "url": "https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75",
          "url": "https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff",
          "url": "https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036",
          "url": "https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036"
        }
      ],
      "release_date": "2024-06-20T12:15:00Z",
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-07-30T06:15:37.492273Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
            "Debian-10:libbpf-dev-0:4.19.325-1.amd64",
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}