CVE-2026-90278

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: md: wait for behind writes before destroying bitmap __md_stop() destroyed the bitmap before calling mddev_detach(). That made mddev_detach() skip bitmap_ops->wait_behind_writes(), because the bitmap was already disconnected from mddev. This was still safe for the legacy bitmap because bitmap_destroy() waits for behind writes itself. llbitmap keeps that wait in its ->wait_behind_writes() operation instead, while ->destroy() tears down the llbitmap storage. With the old ordering, RAID1 behind-write completions could still run after llbitmap storage had been freed. Call mddev_detach() before md_bitmap_destroy() so the common detach path can wait for behind writes while the bitmap is still alive. Only destroy the bitmap after those users are gone.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:24.460000

Last modified

2026-10-19 09:19:21.343000

View original CVE JSON

{
  "id": "CVE-2026-90278",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:24.460",
  "lastModified": "2026-10-19T09:19:21.343",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: wait for behind writes before destroying bitmap\n\n__md_stop() destroyed the bitmap before calling mddev_detach(). That made\nmddev_detach() skip bitmap_ops->wait_behind_writes(), because the bitmap\nwas already disconnected from mddev.\n\nThis was still safe for the legacy bitmap because bitmap_destroy() waits\nfor behind writes itself. llbitmap keeps that wait in its\n->wait_behind_writes() operation instead, while ->destroy() tears down the\nllbitmap storage. With the old ordering, RAID1 behind-write completions\ncould still run after llbitmap storage had been freed.\n\nCall mddev_detach() before md_bitmap_destroy() so the common detach path\ncan wait for behind writes while the bitmap is still alive. Only destroy\nthe bitmap after those users are gone."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/md/md.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "73881ff7a75913f919a1ce9d9571bfaab8e8588d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "4224dccd325a9380e8edfb66aad8bb5771c94222",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "2a79365b2278f16e163e4024086105693b421601",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/md/md.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2a79365b2278f16e163e4024086105693b421601",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4224dccd325a9380e8edfb66aad8bb5771c94222",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/73881ff7a75913f919a1ce9d9571bfaab8e8588d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}