FKIE_CVE-2026-90418

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: nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch Syzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(), which copies dirty DAT file folios/pages to its shadow page cache. The BUG occurs when a retrieved dirty folio/page unexpectedly loses its 'dirty' status. This issue arises because, since the commit referenced below, the 'dirty' flag of a folio/page can be cleared asynchronously after the filesystem detects metadata corruption and transitions to read-only mode. Resolve the issue by returning an -EROFS error if the filesystem has transitioned to read-only mode. Also change the behavior to issue a kernel warning only once instead of triggering a kernel BUG when this unexpected 'dirty' state is detected while the filesystem is not in read-only mode.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/page.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5166a21b12f549774f2983fa86d2526ea9e66ace",
              "status": "affected",
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "versionType": "git"
            },
            {
              "lessThan": "4e1f21e7540b25d83f86b50780836ed7d2afcc93",
              "status": "affected",
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "versionType": "git"
            },
            {
              "lessThan": "3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05",
              "status": "affected",
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "versionType": "git"
            },
            {
              "lessThan": "f181155baf0c93a74ebe804c6cecbe970e78ee9e",
              "status": "affected",
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "versionType": "git"
            },
            {
              "lessThan": "66f4ad3ce158902e5f98afea93189972ed8750c2",
              "status": "affected",
              "version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/page.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
              "lessThan": "3.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "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\nnilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch\n\nSyzbot reported a kernel BUG triggered within nilfs_copy_dirty_pages(),\nwhich copies dirty DAT file folios/pages to its shadow page cache.  The\nBUG occurs when a retrieved dirty folio/page unexpectedly loses its\n\u0027dirty\u0027 status.\n\nThis issue arises because, since the commit referenced below, the \u0027dirty\u0027\nflag of a folio/page can be cleared asynchronously after the filesystem\ndetects metadata corruption and transitions to read-only mode.\n\nResolve the issue by returning an -EROFS error if the filesystem has\ntransitioned to read-only mode.  Also change the behavior to issue a\nkernel warning only once instead of triggering a kernel BUG when this\nunexpected \u0027dirty\u0027 state is detected while the filesystem is not in\nread-only mode."
    }
  ],
  "id": "CVE-2026-90418",
  "lastModified": "2026-09-17T17:17:46.167",
  "metrics": {},
  "published": "2026-09-17T17:17:46.167",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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