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FKIE_CVE-2026-90389

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/28fdea874f68cac6c36651b1fc7272fd2199c48d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a58923756b0f8e71032070c23ae0b167e46731da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bace2010dd7ac07bc980575afb135c406730a7fe
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md-bitmap.c",
            "drivers/md/md.c",
            "drivers/md/md.h",
            "drivers/md/raid5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045",
              "status": "affected",
              "version": "78f57ef9d50a75326da73d352d7c27828495229a",
              "versionType": "git"
            },
            {
              "lessThan": "28fdea874f68cac6c36651b1fc7272fd2199c48d",
              "status": "affected",
              "version": "78f57ef9d50a75326da73d352d7c27828495229a",
              "versionType": "git"
            },
            {
              "lessThan": "a58923756b0f8e71032070c23ae0b167e46731da",
              "status": "affected",
              "version": "78f57ef9d50a75326da73d352d7c27828495229a",
              "versionType": "git"
            },
            {
              "lessThan": "bace2010dd7ac07bc980575afb135c406730a7fe",
              "status": "affected",
              "version": "78f57ef9d50a75326da73d352d7c27828495229a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md-bitmap.c",
            "drivers/md/md.c",
            "drivers/md/md.h",
            "drivers/md/raid5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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",
      "url": "https://git.kernel.org/stable/c/28fdea874f68cac6c36651b1fc7272fd2199c48d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/72ebfdf507ede7d7f2b7ca0a5634811a0e4bf045"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a58923756b0f8e71032070c23ae0b167e46731da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bace2010dd7ac07bc980575afb135c406730a7fe"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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