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CVE-2026-90389 (GCVE-0-2026-90389)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-17 16:09
VLAI
Title
md: scope memalloc_noio to allocation critical sections
Summary
In the Linux kernel, the following vulnerability has been resolved: md: scope memalloc_noio to allocation critical sections Storing a memalloc_noio_save() token in mddev->noio_flags lets one task save the token and another task restore it. With concurrent suspend sysfs writes, task A can enter PF_MEMALLOC_NOIO, return to userspace still in that scope, and later task B can restore A's saved token. Avoid tying the token lifetime to mddev. Keep mddev_suspend() and mddev_resume() only responsible for array suspension, and enter PF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array has been suspended. Restore the token before resuming the array. A reproducer repeatedly writes suspend_lo and suspend_hi from concurrent workers and checks each worker's /proc/self/stat flags before and after the sysfs write.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 78f57ef9d50a75326da73d352d7c27828495229a , < 72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045 (git)
Affected: 78f57ef9d50a75326da73d352d7c27828495229a , < 28fdea874f68cac6c36651b1fc7272fd2199c48d (git)
Affected: 78f57ef9d50a75326da73d352d7c27828495229a , < a58923756b0f8e71032070c23ae0b167e46731da (git)
Affected: 78f57ef9d50a75326da73d352d7c27828495229a , < bace2010dd7ac07bc980575afb135c406730a7fe (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (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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Show details on NVD website
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{
  "containers": {
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/md/md-bitmap.c",
            "drivers/md/md.c",
            "drivers/md/md.h",
            "drivers/md/raid5.c"
          ],
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          "vendor": "Linux",
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              "versionType": "semver"
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: scope memalloc_noio to allocation critical sections\n\nStoring a memalloc_noio_save() token in mddev-\u003enoio_flags lets one task\nsave the token and another task restore it. With concurrent suspend sysfs\nwrites, task A can enter PF_MEMALLOC_NOIO, return to userspace still in\nthat scope, and later task B can restore A\u0027s saved token.\n\nAvoid tying the token lifetime to mddev. Keep mddev_suspend() and\nmddev_resume() only responsible for array suspension, and enter\nPF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array\nhas been suspended. Restore the token before resuming the array.\n\nA reproducer repeatedly writes suspend_lo and suspend_hi from concurrent\nworkers and checks each worker\u0027s /proc/self/stat flags before and after the\nsysfs write."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:09:23.767Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
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        },
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          "url": "https://git.kernel.org/stable/c/bace2010dd7ac07bc980575afb135c406730a7fe"
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      ],
      "title": "md: scope memalloc_noio to allocation critical sections",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90389",
    "datePublished": "2026-09-17T16:09:23.767Z",
    "dateReserved": "2026-09-11T19:38:34.810Z",
    "dateUpdated": "2026-09-17T16:09:23.767Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
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                "product": "Linux",
                "programFiles": [
                  "drivers/md/md-bitmap.c",
                  "drivers/md/md.c",
                  "drivers/md/md.h",
                  "drivers/md/raid5.c"
                ],
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                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                    "version": "7.2.6",
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: scope memalloc_noio to allocation critical sections\n\nStoring a memalloc_noio_save() token in mddev-\u003enoio_flags lets one task\nsave the token and another task restore it. With concurrent suspend sysfs\nwrites, task A can enter PF_MEMALLOC_NOIO, return to userspace still in\nthat scope, and later task B can restore A\u0027s saved token.\n\nAvoid tying the token lifetime to mddev. Keep mddev_suspend() and\nmddev_resume() only responsible for array suspension, and enter\nPF_MEMALLOC_NOIO only in the MD paths that allocate memory after the array\nhas been suspended. Restore the token before resuming the array.\n\nA reproducer repeatedly writes suspend_lo and suspend_hi from concurrent\nworkers and checks each worker\u0027s /proc/self/stat flags before and after the\nsysfs write."
          }
        ],
        "id": "CVE-2026-90389",
        "lastModified": "2026-09-17T17:17:38.427",
        "metrics": {},
        "published": "2026-09-17T17:17:38.427",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.