powerpc/kasan: Fix addr error caused by page alignment

{
  "id": "1b655fccfd7cfbc364edec42926f945633d4ec689a56bed5b353201c18cda2a1",
  "url": "https://osv.dev/vulnerability/CVE-2024-26712",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "powerpc/kasan: Fix addr error caused by page alignment",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Fix addr error caused by page alignment In kasan_init_region, when k_start is not page aligned, at the begin of for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then `va = block + k_cur - k_start` is less than block, the addr va is invalid, because the memory address space from va to block is not alloced by memblock_alloc, which will not be reserved by memblock_reserve later, it will be used by other places. As a result, memory overwriting occurs. for example: int __init __weak kasan_init_region(void *start, size_t size) { [...] /* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */ block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { /* at the begin of for loop * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va(dcd96c00) is less than block(dcd97000), va is invalid */ void *va = block + k_cur - k_start; [...] } [...] } Therefore, page alignment is performed on k_start before memblock_alloc() to ensure the validity of the VA address.",
    "evidence": "osv:CVE-2024-26712",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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          {
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            "evidence": "/affected/1/ranges"
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-26712",
      "aliases": [
        "CVE-2024-26712"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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      "modified": "2026-10-28T02:30:22.738885116Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe",
        "https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058",
        "https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882",
        "https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6",
        "https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0",
        "https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25",
        "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26712.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26712",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26712.json"
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    "related_cves": [
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        "value": "CVE-2024-26712",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488896,
  "published_at": "2024-04-03T14:55:14.149+00:00"
}