CVE-2026-90418 (GCVE-0-2026-90418)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:03
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
Impacted products
Vendor Product Version
Linux Linux Version: 8c26c4e2694a163d525976e804d81cd955bbb40c
Version: 8c26c4e2694a163d525976e804d81cd955bbb40c
Version: 8c26c4e2694a163d525976e804d81cd955bbb40c
Version: 8c26c4e2694a163d525976e804d81cd955bbb40c
Version: 8c26c4e2694a163d525976e804d81cd955bbb40c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/page.c"
          ],
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          "vendor": "Linux",
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              "versionType": "git"
            }
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        },
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.10"
            },
            {
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "3.10",
                  "vulnerable": true
                },
                {
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:22.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5166a21b12f549774f2983fa86d2526ea9e66ace"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e1f21e7540b25d83f86b50780836ed7d2afcc93"
        },
        {
          "url": "https://git.kernel.org/stable/c/3904fb0ee741ebbbc27ec8f50a9bb6cd31e8af05"
        },
        {
          "url": "https://git.kernel.org/stable/c/f181155baf0c93a74ebe804c6cecbe970e78ee9e"
        },
        {
          "url": "https://git.kernel.org/stable/c/66f4ad3ce158902e5f98afea93189972ed8750c2"
        }
      ],
      "title": "nilfs2: fix BUG in nilfs_copy_dirty_pages() on dirty state mismatch",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90418",
    "datePublished": "2026-09-17T16:09:43.223Z",
    "dateReserved": "2026-09-11T19:38:34.813Z",
    "dateUpdated": "2026-10-19T09:03:22.352Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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