{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74374",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74374"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "md/raid1,raid10: fix error-path detection with md_cloned_bio()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1,raid10: fix error-path detection with md_cloned_bio()\n\nDetect the error path using md_cloned_bio() instead of relying\non r1_bio in raid1 or r10_bio->read_slot in raid10, which may be\nNULL or -1 after splitting and resubmitting a failed bio.\n\nAs a result, the error path may not be recognized and memory\nallocations can incorrectly use GFP_NOIO instead of\n(GFP_NOIO | __GFP_HIGH), which can lead to a deadlock under\nmemory pressure.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74374"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20fb582c92fd64e5c8bd83c6176264b2794603b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/811545e0926d02a6a0b1a1258bb5544777c164d4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - Linux file/NAS servers commonly export md RAID1/RAID10 volumes via nfsd, ksmbd, or iSCSI; remote client reads reach md_submit_bio()\u2192raid1/raid10_read_request(), and mirror read failures drive handle_read_error() on the blocked raid1d/raid10d thread without local shell access.\nAC:L - An attacker can reliably hit the bug by reading sectors on a degraded mirror that return errors (common on production arrays), issuing large reads that bio_submit_split_bioset() splits on the error-retry path, and concurrently applying memory pressure so GFP_NOIO bio_alloc_clone() blocks reclaim while raid1d/raid10d holds the array frozen.\nPR:N - Triggering the fault path requires only permission to read exported storage or files on an md-backed filesystem; no CAP_SYS_ADMIN, md ioctl, or init-namespace root is needed because read I/O and mirror error recovery run with no extra capability checks beyond normal block-device access.\nUI:N - No victim interaction is required; exploitation uses the attacker's own read I/O (or scripted NFS/SMB/iSCSI reads) together with memory pressure, without anyone mounting disks, acknowledging bad blocks, or performing other cooperative actions.\nS:U - The circular GFP_NOIO allocation wait while raid1d/raid10d is blocked in handle_read_error() freezes I/O within the same host kernel and md security domain; it does not cross VM, container, or IOMMU boundaries.\nC:N - This is a GFP-flag misclassification causing reclaim/I/O circular wait (deadlock), not memory corruption, out-of-bounds access, use-after-free, or other primitives that could disclose kernel or user data.\nI:N - The flaw does not enable arbitrary writes, code execution, or silent data modification; impact is limited to blocking forward progress in the RAID error-recovery path under memory pressure.\nA:H - Without __GFP_HIGH on the error path, bio_alloc_clone() can stall reclaim while raid1d/raid10d blocks with the array frozen, deadlocking all I/O to the md device and potentially hanging root/data volumes on enterprise RAID1/RAID10 servers."
    }
  }
}