CVE-2026-90278

Status: ReceivedUnscored—

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.

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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.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.21%
Percentile among all scored CVEs: 10
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-90278",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "73881ff7a75913f919a1ce9d9571bfaab8e8588d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "4224dccd325a9380e8edfb66aad8bb5771c94222",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5ab829f1971dc99f2aac10846c378e67fc875abc",
              "lessThan": "2a79365b2278f16e163e4024086105693b421601",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/md/md.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/md/md.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:24.460",
  "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"
    }
  ],
  "vulnStatus": "Received",
  "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."
    }
  ],
  "lastModified": "2026-09-17T17:17:24.460",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}