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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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        "summary": "Canonical URL",
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          "date": "2021-01-01T00:00:00Z",
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Don't call kcalloc() if size arg is zero\n\nIf the size arg to kcalloc() is zero, it returns ZERO_SIZE_PTR.  Because of\nthat, for a following NULL pointer check to work on the returned pointer,\nkcalloc() must not be called with the size arg equal to zero. Return early\nwithout error before the kcalloc() call if size arg is zero.\n\nBUG: KASAN: null-ptr-deref in memcpy include/linux/fortify-string.h:191 [inline]\nBUG: KASAN: null-ptr-deref in sg_copy_buffer+0x138/0x240 lib/scatterlist.c:974\nWrite of size 4 at addr 0000000000000010 by task syz-executor.1/22789\n\nCPU: 1 PID: 22789 Comm: syz-executor.1 Not tainted 5.15.0-syzk #1\nHardware name: Red Hat KVM, BIOS 1.13.0-2\nCall Trace:\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106\n __kasan_report mm/kasan/report.c:446 [inline]\n kasan_report.cold.14+0x112/0x117 mm/kasan/report.c:459\n check_region_inline mm/kasan/generic.c:183 [inline]\n kasan_check_range+0x1a3/0x210 mm/kasan/generic.c:189\n memcpy+0x3b/0x60 mm/kasan/shadow.c:66\n memcpy include/linux/fortify-string.h:191 [inline]\n sg_copy_buffer+0x138/0x240 lib/scatterlist.c:974\n do_dout_fetch drivers/scsi/scsi_debug.c:2954 [inline]\n do_dout_fetch drivers/scsi/scsi_debug.c:2946 [inline]\n resp_verify+0x49e/0x930 drivers/scsi/scsi_debug.c:4276\n schedule_resp+0x4d8/0x1a70 drivers/scsi/scsi_debug.c:5478\n scsi_debug_queuecommand+0x8c9/0x1ec0 drivers/scsi/scsi_debug.c:7533\n scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1520 [inline]\n scsi_queue_rq+0x16b0/0x2d40 drivers/scsi/scsi_lib.c:1699\n blk_mq_dispatch_rq_list+0xb9b/0x2700 block/blk-mq.c:1639\n __blk_mq_sched_dispatch_requests+0x28f/0x590 block/blk-mq-sched.c:325\n blk_mq_sched_dispatch_requests+0x105/0x190 block/blk-mq-sched.c:358\n __blk_mq_run_hw_queue+0xe5/0x150 block/blk-mq.c:1761\n __blk_mq_delay_run_hw_queue+0x4f8/0x5c0 block/blk-mq.c:1838\n blk_mq_run_hw_queue+0x18d/0x350 block/blk-mq.c:1891\n blk_mq_sched_insert_request+0x3db/0x4e0 block/blk-mq-sched.c:474\n blk_execute_rq_nowait+0x16b/0x1c0 block/blk-exec.c:62\n blk_execute_rq+0xdb/0x360 block/blk-exec.c:102\n sg_scsi_ioctl drivers/scsi/scsi_ioctl.c:621 [inline]\n scsi_ioctl+0x8bb/0x15c0 drivers/scsi/scsi_ioctl.c:930\n sg_ioctl_common+0x172d/0x2710 drivers/scsi/sg.c:1112\n sg_ioctl+0xa2/0x180 drivers/scsi/sg.c:1165\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:874 [inline]\n __se_sys_ioctl fs/ioctl.c:860 [inline]\n __x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3a/0x80 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x44/0xae",
          "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": {
        "known_affected": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-47578"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/3344b58b53a76199dae48faa396e9fc37bf86992",
          "url": "https://git.kernel.org/stable/c/3344b58b53a76199dae48faa396e9fc37bf86992"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/47d11d35203b0aa13533634e270fe2c3610e531b",
          "url": "https://git.kernel.org/stable/c/47d11d35203b0aa13533634e270fe2c3610e531b"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/aa1f912712a109b6306746133de7e5343f016b26",
          "url": "https://git.kernel.org/stable/c/aa1f912712a109b6306746133de7e5343f016b26"
        }
      ],
      "release_date": "2024-06-19T15:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-22T14:51:58.298329Z",
          "details": "This is a local denial‑of‑service condition confined to the scsi_debug testing driver, which is a synthetic SCSI device typically built as a module and not loaded unless explicitly requested; the issue is only reachable if a scsi_debug device is present and user code can issue SCSI generic ioctls to it. There is no confidentiality or integrity impact—exploitation results in a NULL‑pointer dereference and crash only. Given these non‑default prerequisites and DoS‑only outcome, it can be safely deprioritized for managed enterprise VMs and servers.",
          "product_ids": [
            "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}