GHSA-2M53-W88C-RH92

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: s390: Fix length check __import_wp_info()

struct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user space. This is then assigned to wp_info->len, which is an int. The bounds check is done on the truncated value while the allocation uses the untruncated one:

wp_info->len = bp_data->len;
[...]
if (wp_info->len < 0 || wp_info->len > MAX_WP_SIZE)
    return -EINVAL;

wp_info->old_data = kmalloc(bp_data->len, GFP_KERNEL_ACCOUNT);

Use the validated value for the allocation as intended. Without this fix userspace can trigger >4GB allocations which will fail and result in a WARN due to MAX_PAGE_ORDER.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89926"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:17:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix length check __import_wp_info()\n\nstruct kvm_hw_breakpoint::len is a __u64 that is fully controlled by user\nspace. This is then assigned to wp_info-\u003elen, which is an int. The bounds\ncheck is done on the truncated value while the allocation uses the\nuntruncated one:\n\n\twp_info-\u003elen = bp_data-\u003elen;\n\t[...]\n\tif (wp_info-\u003elen \u003c 0 || wp_info-\u003elen \u003e MAX_WP_SIZE)\n\t\treturn -EINVAL;\n\n\twp_info-\u003eold_data = kmalloc(bp_data-\u003elen, GFP_KERNEL_ACCOUNT);\n\nUse the validated value for the allocation as intended. Without this\nfix userspace can trigger \u003e4GB allocations which will fail and result\nin a WARN due to MAX_PAGE_ORDER.",
  "id": "GHSA-2m53-w88c-rh92",
  "modified": "2026-09-16T12:30:41Z",
  "published": "2026-09-16T12:30:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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