CVE-2026-90419 (GCVE-0-2026-90419)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:03
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: prevent out-of-bounds read in super root block parsing super-root inode metadata size is trusted before nilfs_read_inode_common(). Reject super-root inode sizes whose computed on-disk footprint exceeds the filesystem block size. This prevents malformed filesystem images from making nilfs_read_inode_common() read past the end of the super-root block. [ryusuke: clarify the commit title]
References
Impacted products
Vendor Product Version
Linux Linux Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
Version: 8a9d2191e9f43bbcd256a9a6871bd73434c83f2f
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/the_nilfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "16df2520502867a4f34e202b89d01243d59bb8b5",
              "status": "affected",
              "version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nilfs2/the_nilfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "lessThan": "2.6.30",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "2.6.30",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: prevent out-of-bounds read in super root block parsing\n\nsuper-root inode metadata size is trusted before nilfs_read_inode_common().\n\nReject super-root inode sizes whose computed on-disk footprint exceeds the\nfilesystem block size. This prevents malformed filesystem images from\nmaking nilfs_read_inode_common() read past the end of the super-root block.\n\n[ryusuke: clarify the commit title]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The oversized s_inode_size is on-disk in the nilfs2 superblock; nilfs_store_disk_layout() stores it and nilfs_load_super_root() indexes the super-root buffer with NILFS_SR_CPFILE_OFFSET during local mount (nilfs_get_tree \u2192 nilfs_fill_super \u2192 init_nilfs/load_nilfs). No network protocol carries s_inode_size.\nAC:L - A crafted s_inode_size that still passes ns_inode_size \u003c= ns_blocksize but makes NILFS_SR_BYTES(inode_size) exceed ns_blocksize (for example inode_size == blocksize) puts NILFS_SR_CPFILE_OFFSET/SUFILE_OFFSET past bh_sr-\u003eb_data, so nilfs_read_inode_common() over-reads on every mount of that image. There is no race.\nPR:N - Crafting the image needs no host account. nilfs_fs_type.fs_flags is only FS_REQUIRES_DEV (no FS_USERNS_MOUNT), so mount_capable() requires init-namespace CAP_SYS_ADMIN; that privileged mount is the victim\u0027s action and is scored as UI:R, not attacker privilege.\nUI:R - The over-read runs only in nilfs_load_super_root() from nilfs_fill_super() after a victim or automounter mounts the attacker-supplied nilfs2 image via mount/fsopen. That mount is the required user interaction.\nS:U - nilfs_read_inode_common()\u0027s over-read of the super-root buffer_head stays in the host kernel mount path and does not cross a VM, IOMMU, or sandbox authority.\nC:H - With inode_size == ns_blocksize, NILFS_SR_CPFILE_OFFSET is 16 bytes past the super-root block, and nilfs_read_inode_common() loads a full 128-byte struct nilfs_inode (including a 56-byte i_bmap memcpy in nilfs_bmap_read) from that address. That is not a few-byte leak.\nI:N - The defect is a source over-read into in-bounds VFS inode and bmap fields; there is no store through the out-of-bounds pointer and no OOB write. Leaked i_bmap words are used only as on-disk block numbers, not as a kernel write primitive.\nA:H - A 4K block with inode_size == 4096 places the cpfile inode 16 bytes past the page-backed super-root buffer, so the 128-byte load can fault on an unmapped next linear-map page (KASAN, debug_pagealloc, page poisoning) and oops the mounting kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:23.291Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/16df2520502867a4f34e202b89d01243d59bb8b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcc85fc28f884038735464f6f104dda9c7dbfad6"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b69ebe20d7f944c1f45177dca0c11474ac277cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7029e70cf86d5c54c0a2812479b0bee2cabcbaaa"
        },
        {
          "url": "https://git.kernel.org/stable/c/71bd64471ff583101b4a33dfc838ce29aef57960"
        },
        {
          "url": "https://git.kernel.org/stable/c/842397fdfd2e61d6470166c796f3125b6c27a162"
        },
        {
          "url": "https://git.kernel.org/stable/c/15c8559376416a84c3d8402fd8d0c89bb323d05f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689"
        }
      ],
      "title": "nilfs2: prevent out-of-bounds read in super root block parsing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90419",
    "datePublished": "2026-09-17T16:09:43.880Z",
    "dateReserved": "2026-09-11T19:38:34.813Z",
    "dateUpdated": "2026-10-19T09:03:23.291Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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