raid1: fix nr_pending leak in REQ_ATOMIC bad-block error path

{
  "id": "6569f39e075a6b1913eae750f738b375d2bbecda05c10fcf5960d806ccd5a204",
  "url": "https://osv.dev/vulnerability/CVE-2026-74372",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "raid1: fix nr_pending leak in REQ_ATOMIC bad-block error path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: raid1: fix nr_pending leak in REQ_ATOMIC bad-block error path In raid1_write_request(), each per-mirror loop iteration begins by incrementing rdev->nr_pending. If a REQ_ATOMIC write encounters a badblock within the requested range, the code jumps to err_handle without dropping the reference taken for the current mirror. err_handle's cleanup loop will only decrements for k < i and r1_bio->bios[k] is non-NULL. The current slot is therefore skipped, leaving its nr_pending reference leaked permanently. The reference prevents the rdev from ever being removed, since raid1_remove_conf() refuses to remove an rdev with nr_pending > 0. Fix this by calling rdev_dec_pending() before jumping to err_handle.",
    "evidence": "osv:CVE-2026-74372",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-74372",
      "aliases": [
        "CVE-2026-74372"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f2a38abf5f1c5aeb3be8e9f4d3d815c867fff7ca"
                },
                {
                  "fixed": "5ac9e793ba2583d72740d929e7858a6c82e22ed5"
                },
                {
                  "fixed": "731485617bf862f1289c3f40ed1f800d0475826f"
                },
                {
                  "fixed": "909d9dc3b5730c8ed7b764c68bc788342df2a07b"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74372.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74372.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.011096754Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5ac9e793ba2583d72740d929e7858a6c82e22ed5",
        "https://git.kernel.org/stable/c/731485617bf862f1289c3f40ed1f800d0475826f",
        "https://git.kernel.org/stable/c/909d9dc3b5730c8ed7b764c68bc788342df2a07b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74372.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74372",
        "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/2026/74xxx/CVE-2026-74372.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74372",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508745,
  "published_at": "2026-08-15T05:58:52.306+00:00"
}