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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": "2026-07-19T14:55:00Z",
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          "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64"
        },
        "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64",
        "relates_to_product_reference": "Debian-10"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-63887",
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf\n\niscsi_encode_text_output() concatenates \"key=value\\0\" records into\nlogin->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer\nallocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call\nsites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check\nthe remaining buffer capacity:\n\n\t*length += sprintf(output_buf, \"%s=%s\", er->key, er->value);\n\t*length += 1;\n\toutput_buf = textbuf + *length;\n\nThe 8192-byte ceiling at iscsi_target_check_login_request() bounds the\n*input* Login PDU payload, but a single PDU can carry up to 2048 minimal\nfour-byte \"a=b\\0\" pairs, each unknown key expanding to a 16-byte\n\"a=NotUnderstood\\0\" output record via iscsi_add_notunderstood_response().\n2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB\nheap overrun in the kmalloc-8k slab.\n\nThe fix introduces a static iscsi_encode_text_record() helper that uses\nsnprintf() with a per-call bounds check against the remaining buffer,\nand threads a u32 textbuf_size parameter through\niscsi_encode_text_output(). Both call sites in\niscsi_target_handle_csg_zero() (PHASE_SECURITY) and\niscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass\nMAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls\niscsi_release_extra_responses() to drop queued records, and returns -1;\nboth caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR /\nISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning,\nso the initiator sees an explicit failed-login response rather than a\nsilent connection drop. (Prior to this patch only the PHASE_OPERATIONAL\ncaller did that; the PHASE_SECURITY caller is converted to the same\nshape.)",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "under_investigation": [
          "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libbpf-dev-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libbpf4.19-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libcpupower-dev-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:libcpupower1-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-config-4.19-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-cpupower-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-doc-4.19-0:4.19.325-2+tuxcare.els1.all",
          "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-headers-4.19.0-29-all-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-29-all-amd64-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-29-amd64-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-headers-4.19.0-29-common-0:4.19.325-2+tuxcare.els1.all",
          "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-image-4.19.0-29-amd64-unsigned-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-image-amd64-signed-template-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-kbuild-4.19-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-libc-dev-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:linux-perf-4.19-0:4.19.325-2+tuxcare.els1.amd64",
          "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-source-4.19-0:4.19.325-2+tuxcare.els1.all",
          "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all",
          "Debian-10:linux-support-4.19.0-29-0:4.19.325-2+tuxcare.els1.all"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63887"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/26e4a304b7e6f1338c675d527608d32549c091db",
          "url": "https://git.kernel.org/stable/c/26e4a304b7e6f1338c675d527608d32549c091db"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/30bf335e8fe170322080ee001f05ca29c50680b3",
          "url": "https://git.kernel.org/stable/c/30bf335e8fe170322080ee001f05ca29c50680b3"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/4e9f0c4a645c995bc75c06c7b3644254ffb4c76b",
          "url": "https://git.kernel.org/stable/c/4e9f0c4a645c995bc75c06c7b3644254ffb4c76b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/594a40360012ce5f94c715d5e3b20fa3af7d525a",
          "url": "https://git.kernel.org/stable/c/594a40360012ce5f94c715d5e3b20fa3af7d525a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/b19382dfc6e7dee6d3859ba44b6ca29e97a51627",
          "url": "https://git.kernel.org/stable/c/b19382dfc6e7dee6d3859ba44b6ca29e97a51627"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/bf33e01f88388c43e285492a63e539df6ffed64c",
          "url": "https://git.kernel.org/stable/c/bf33e01f88388c43e285492a63e539df6ffed64c"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/cb84e974fb172bc71386289f37b78ea679410b39",
          "url": "https://git.kernel.org/stable/c/cb84e974fb172bc71386289f37b78ea679410b39"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/efe633e600a0ac68357206fede21b1ac8178f3b8",
          "url": "https://git.kernel.org/stable/c/efe633e600a0ac68357206fede21b1ac8178f3b8"
        }
      ],
      "release_date": "2026-07-19T14:55:00Z",
      "remediations": [
        {
          "category": "none_available",
          "date": "2026-09-16T13:14:10.567752Z",
          "details": "Affected",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
            "Debian-10:hyperv-daemons-0:4.19.325-2+tuxcare.els1.amd64",
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      ]
    }
  ]
}