{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-47682",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2024-47682"
  ],
  "published": "2024-10-21T12:02:02Z",
  "summary": "scsi: sd: Fix off-by-one error in sd_read_block_characteristics()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: sd: Fix off-by-one error in sd_read_block_characteristics()\n\nFf the device returns page 0xb1 with length 8 (happens with qemu v2.x, for\nexample), sd_read_block_characteristics() may attempt an out-of-bounds\nmemory access when accessing the zoned field at offset 8.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-47682"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60312ae7392f9c75c6591a52fc359cf7f810d48f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/568c7c4c77eee6df7677bb861b7cee7398a3255d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a776050373893e4c847a49abeae2ccb581153df0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/413df704f149dec585df07466d2401bbd1f490a0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f81eaf08385ddd474a2f41595a7757502870c0eb"
    }
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.6,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The out-of-bounds read is driven entirely by the SCSI target's INQUIRY VPD page 0xb1 response, and the sd driver sits on top of network transports (iSCSI over TCP/3260, SRP, FCoE) where that response arrives from a remote peer. A malicious or compromised target \u2014 or an attacker spoofing/MITM'ing a commonly-unauthenticated iSCSI session \u2014 supplies the short page directly over the network.\nAC:L - The target simply reports page 0xb1 with a page length of 4 (total length 8), which makes vpd->len == 8 pass the `< 8` check and the read of data[8] occur deterministically on every probe/rescan. This is a real-world occurrence (qemu 2.x), requiring no timing, layout, or race conditions.\nPR:N - The remote target holds no privileges on the initiator host; the malformed VPD page is consumed unconditionally during device discovery/revalidation with no authentication or capability check on the initiator side. iSCSI is frequently deployed without CHAP, so no credentials are needed.\nUI:N - No operator action is required \u2014 sd_revalidate_disk() runs automatically on probe, on iSCSI session reconnect, and on rescan, so the attacker-controlled response is parsed without any victim interaction.\nS:U - The OOB read and its consequences are confined to the kernel's own memory and the SCSI/block layer's data structures; no security authority boundary such as a VM or IOMMU boundary is crossed.\nC:L - The read is strictly bounded to a single byte at a fixed offset past the VPD data, and only bits 4-5 of it become observable, surfacing through /sys/block/sdX/device/zoned_cap and the dmesg classification message. The attacker cannot scan or seek to arbitrary memory, so the disclosure of uninitialized heap content is limited.\nI:L - Uninitialized/out-of-bounds heap content is written into sdkp->zoned and then used to configure the block device's zoned model via disk_set_zoned(), so uncontrolled data modifies persistent kernel device state. The modification is limited and not attacker-chosen, so it does not amount to an arbitrary write.\nA:H - When the stale byte yields zoned == 1, a normal disk is misclassified as host-aware zoned and sd_zbc_read_zones() fails, driving the error path that sets sdkp->capacity = 0 and zeroes the gendisk capacity \u2014 the storage device becomes unusable, which is fatal if it is the boot/root disk. Additionally the access crosses the kmalloc request boundary on 32-bit and under KFENCE/KASAN, producing a slab-out-of-bounds report that panics on panic_on_warn configurations."
    }
  }
}