mtd: block2mtd: Fix divide error when erase_size is zero

{
  "id": "0be7cd7f98dbdd2ab93d26cd1e976a24f6812d3a24b75620991248aeff148f21",
  "url": "https://osv.dev/vulnerability/CVE-2026-98722",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mtd: block2mtd: Fix divide error when erase_size is zero",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mtd: block2mtd: Fix divide error when erase_size is zero The erase size is parsed from the \"block2mtd\" module parameter and can be set to zero. add_device() then evaluates if (size % erase_size) with a zero divisor, which triggers a divide error: divide error: 0000 [#1] PREEMPT SMP PTI RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline] RIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459 Call Trace: block2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476 param_attr_store+0x214/0x310 kernel/params.c:589 module_attr_store+0x65/0x90 kernel/params.c:904 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 ... Reject a zero erase size before performing the modulo operation so the existing \"erasesize must be a divisor of device size\" error path reports the invalid argument and frees the device.",
    "evidence": "osv:CVE-2026-98722",
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "modified": "2026-11-01T02:30:16.223344920Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/21d0f05989bf0d5cef57b467a7fa4feefbd7236a",
        "https://git.kernel.org/stable/c/7ad5287e58d7aa1a848105f119e6c5b00446882f",
        "https://git.kernel.org/stable/c/826170a49ca1315af6b293a02200585b1e2186d9",
        "https://git.kernel.org/stable/c/a991c28066e7ba4da7450bb04478849f7ac6a14a",
        "https://git.kernel.org/stable/c/b5965c4221165045e19736794ca5f48ae3d67142",
        "https://git.kernel.org/stable/c/bff83b723e93acc788bd690dc4bc1f6f4356c35b",
        "https://git.kernel.org/stable/c/c8004de07739fa9a39e310e859384f1458d7d076",
        "https://git.kernel.org/stable/c/fd73c079abc58e10183a4db4dc9dc5012db17476",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98722.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98722",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505441,
  "published_at": "2026-10-18T15:46:58.093+00:00"
}