{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/compress.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b42644e425fed4a5cd6c88372655da5c1b52c666",
              "status": "affected",
              "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
              "versionType": "git"
            },
            {
              "lessThan": "98716c9fce21f6c8a9d71e08cf53e7504fa562f4",
              "status": "affected",
              "version": "1e9ea7e04472d4e5e12e58c881eaacfb3e49b669",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/compress.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "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": "7.2.6",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: fix off-by-one page overflow in ntfs_decompress()\n\nThe per-token range check in ntfs_decompress() uses\n\n\tif (cb \u003e= cb_sb_end || dp_addr \u003e dp_sb_end)\n\t\tbreak;\n\nso dp_addr == dp_sb_end falls through to the symbol copy\n`*dp_addr++ = *cb++`, writing one byte past the destination page.  Since\nNTFS_SB_SIZE == PAGE_SIZE the destination is a single page, so the byte\nlands in the adjacent page, and *dest_ofs is left one past the sub-block\nend (the later `*dest_ofs \u0026= ~PAGE_MASK` then yields 1, not 0, so the page\nis never finalized and later sub-blocks keep writing further past it).  A\ncorrupted compressed $DATA attribute thus produces a bounded run of\nout-of-bounds writes when the file is read.\n\nBreak as soon as dp_addr reaches dp_sb_end; a full sub-block still\ncompletes, as its final copy advances dp_addr to exactly dp_sb_end."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The overflowing bytes are LZNT-style symbol tokens in a compressed unnamed $DATA attribute. They reach ntfs_decompress() only after ntfs_file_read_iter\u2192generic_file_read_iter\u2192ntfs_read_folio\u2192ntfs_read_compressed_block() copies those clusters from the block device; a remote client does not carry the token stream.\nAC:L - A crafted compressed $DATA that leaves dp_addr==dp_sb_end makes the per-token `dp_addr \u003e dp_sb_end` check fall through to `*dp_addr++ = *cb++`. Ending the sub-block so `*dest_ofs \u0026= ~PAGE_MASK` yields 1 is deterministic and does not depend on a race or uninfluenced layout.\nPR:N - The attacker only needs to supply the image that contains the malformed compressed $DATA; ntfs_fs_type has no FS_USERNS_MOUNT so mount_capable() needs init-namespace CAP_SYS_ADMIN, which is the victim\u0027s mount (UI:R), not an attacker privilege on the target.\nUI:R - The malformed tokens exist only on the attacker-supplied volume. ntfs_get_tree()\u2192get_tree_bdev()\u2192ntfs_fill_super() must mount that image before ntfs_file_read_iter can read the compressed file and enter ntfs_decompress().\nS:U - The write past kmap_local_page() of dest_pages[] corrupts the host kernel\u0027s adjacent page in the same OS security domain; it is not a VM, IOMMU, or sandbox boundary crossing.\nC:H - The off-by-one `*dp_addr++ = *cb++` plus later sub-blocks (dest_ofs left at 1, so the dest folio is never finalized) overwrite the physically adjacent kernel page, a memory-corruption primitive that can be leveraged for kernel information disclosure.\nI:H - Each overflowing symbol token writes an attacker-chosen byte from the compressed stream one past the destination page, and later sub-blocks keep writing further past it into the adjacent page, an out-of-bounds kernel write usable for control-flow hijack.\nA:H - Writing past the kmap_local_page() mapping of the dest folio into the next pfn can oops or panic the kernel on the ntfs_file_read_iter\u2192ntfs_decompress() path even when the overflow is not turned into a reliable write primitive."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:58:16.740Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b42644e425fed4a5cd6c88372655da5c1b52c666"
        },
        {
          "url": "https://git.kernel.org/stable/c/98716c9fce21f6c8a9d71e08cf53e7504fa562f4"
        }
      ],
      "title": "ntfs: fix off-by-one page overflow in ntfs_decompress()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90118",
    "datePublished": "2026-09-17T16:06:23.333Z",
    "dateReserved": "2026-09-11T19:38:34.787Z",
    "dateUpdated": "2026-10-19T08:58:16.740Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}