CVE-2026-90278 (GCVE-0-2026-90278)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-17 16:08
VLAI
Title
md: wait for behind writes before destroying bitmap
Summary
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ab829f1971dc99f2aac10846c378e67fc875abc , < 73881ff7a75913f919a1ce9d9571bfaab8e8588d (git)
Affected: 5ab829f1971dc99f2aac10846c378e67fc875abc , < 4224dccd325a9380e8edfb66aad8bb5771c94222 (git)
Affected: 5ab829f1971dc99f2aac10846c378e67fc875abc , < 2a79365b2278f16e163e4024086105693b421601 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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-\u003ewait_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-\u003ewait_behind_writes() operation instead, while -\u003edestroy() 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."
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            "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-\u003ewait_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-\u003ewait_behind_writes() operation instead, while -\u003edestroy() 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."
          }
        ],
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        "metrics": {},
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      "cve": "CVE-2026-90278",
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      "source": "SUSE CSAF VEX",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-90278.json",
      "version": "2"
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}



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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.

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Nomenclature

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  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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