CVE-2026-72437 (GCVE-0-2026-72437)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:14
VLAI
Title
md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry When a read is retried, raid1_read_request() may be called with a pre-allocated r1_bio. If wait_read_barrier() fails for a REQ_NOWAIT read, the bio is completed and the function returns immediately. In this case the existing r1_bio is leaked. This fixes a leak of pre-allocated r1_bio structures for retried reads.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < d1eda529a4bf6b866d02755723ee0eb1f037a5ed (git)
Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < c66ed3e6371f5dba8f5d8ab810d6683ddc99201e (git)
Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < db58075bc9c2ad2731f9c063859b47104bc2e7ef (git)
Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < 6d92dbd73d19a0622f60352ce9d9379f7a760112 (git)
Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < c6e6354295845698d2fdfa20b71fc404786f7e93 (git)
Affected: 5aa705039c4fca84575539bfa2b8a28454a3d2ca , < 69ad6ce47f9bf2b9fe0ed69b042db993d33bbf12 (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry\n\nWhen a read is retried, raid1_read_request() may be called with a\npre-allocated r1_bio. If wait_read_barrier() fails for a REQ_NOWAIT\nread, the bio is completed and the function returns immediately. In this\ncase the existing r1_bio is leaked.\n\nThis fixes a leak of pre-allocated r1_bio structures for retried reads."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:14:37.742Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/c66ed3e6371f5dba8f5d8ab810d6683ddc99201e"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/69ad6ce47f9bf2b9fe0ed69b042db993d33bbf12"
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      ],
      "title": "md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    "datePublished": "2026-08-15T05:56:50.732Z",
    "dateReserved": "2026-08-09T03:40:39.929Z",
    "dateUpdated": "2026-08-17T05:14:37.742Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry\n\nWhen a read is retried, raid1_read_request() may be called with a\npre-allocated r1_bio. If wait_read_barrier() fails for a REQ_NOWAIT\nread, the bio is completed and the function returns immediately. In this\ncase the existing r1_bio is leaked.\n\nThis fixes a leak of pre-allocated r1_bio structures for retried reads."
          }
        ],
        "id": "CVE-2026-72437",
        "lastModified": "2026-08-17T06:19:11.080",
        "metrics": {},
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        "vulnStatus": "Received"
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      "current_release_date": "2026-08-19T17:53:56+00:00",
      "cve": "CVE-2026-72437",
      "id": "CVE-2026-72437",
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      "product_status:known_affected": "246",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: md/raid1: free r1_bio when REQ_NOWAIT is set and read would block on retry",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72437.json",
      "version": "3"
    },
    "suse_vex": {
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      "cve": "CVE-2026-72437",
      "id": "CVE-2026-72437",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72437",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72437.json",
      "version": "5"
    }
  }
}



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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.
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  • 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.



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