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CVE-2026-74374 (GCVE-0-2026-74374)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:46
VLAI
Title
md/raid1,raid10: fix error-path detection with md_cloned_bio()
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid1,raid10: fix error-path detection with md_cloned_bio() Detect the error path using md_cloned_bio() instead of relying on r1_bio in raid1 or r10_bio->read_slot in raid10, which may be NULL or -1 after splitting and resubmitting a failed bio. As a result, the error path may not be recognized and memory allocations can incorrectly use GFP_NOIO instead of (GFP_NOIO | __GFP_HIGH), which can lead to a deadlock under memory pressure.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 689389a06ce79fdced85b5115717f71c71e623e0 , < 20fb582c92fd64e5c8bd83c6176264b2794603b7 (git)
Affected: 689389a06ce79fdced85b5115717f71c71e623e0 , < 811545e0926d02a6a0b1a1258bb5544777c164d4 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/raid1.c",
            "drivers/md/raid10.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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          "versions": [
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "4.12",
                  "vulnerable": true
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                  "versionStartIncluding": "4.12",
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              "operator": "OR"
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          "lang": "en",
          "value": "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-\u003eread_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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:27.554Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/20fb582c92fd64e5c8bd83c6176264b2794603b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/811545e0926d02a6a0b1a1258bb5544777c164d4"
        }
      ],
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        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74374",
    "datePublished": "2026-08-15T05:58:53.659Z",
    "dateReserved": "2026-08-15T05:44:03.889Z",
    "dateUpdated": "2026-08-17T05:46:27.554Z",
    "state": "PUBLISHED"
  },
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      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "md/raid1,raid10: fix error-path detection with md_cloned_bio()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74374.json",
      "version": "1"
    },
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      "cve": "CVE-2026-74374",
      "id": "CVE-2026-74374",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: md/raid1,raid10: fix error-path detection with md_cloned_bio()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74374.json",
      "version": "3"
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    "suse_vex": {
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      "id": "CVE-2026-74374",
      "initial_release_date": "2026-08-31T16:24:56Z",
      "product_status:known_affected": "358",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
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      "title": "SUSE CVE CVE-2026-74374",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74374.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.