{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c",
            "fs/ntfs/attrib.h",
            "fs/ntfs/attrlist.c",
            "fs/ntfs/attrlist.h",
            "fs/ntfs/compress.c",
            "fs/ntfs/file.c",
            "fs/ntfs/inode.c",
            "fs/ntfs/mft.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "742797432e8c9b0dd54ecc523c185e26b09d79a0",
              "status": "affected",
              "version": "495e90fa334828d4119061e2726af51d0a0fb4ed",
              "versionType": "git"
            },
            {
              "lessThan": "91709ba5d6d709b2b663287b7e871e2c6b480502",
              "status": "affected",
              "version": "495e90fa334828d4119061e2726af51d0a0fb4ed",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs/attrib.c",
            "fs/ntfs/attrib.h",
            "fs/ntfs/attrlist.c",
            "fs/ntfs/attrlist.h",
            "fs/ntfs/compress.c",
            "fs/ntfs/file.c",
            "fs/ntfs/inode.c",
            "fs/ntfs/mft.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": "7.2.8",
              "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": "7.2.8",
                  "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: protect runlist updates with the runlist lock\n\nntfs_non_resident_attr_shrink() calls runlist helpers that require the\nrunlist write lock, but did not hold it while freeing clusters and\ntruncating the runlist. Serialize those operations and the resident\nconversion with the runlist lock.\n\nntfs_attr_map_cluster() can merge a newly allocated run before updating\nmapping pairs. If the update fails, free the clusters and restore both\nthe in-memory runlist and on-disk mapping pairs from a saved runlist.\nMark the volume in error if either rollback step fails."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The trigger is a local ftruncate() on a file in a mounted NTFS volume, via ntfs_setattr_size()-\u003entfs_truncate_vfs()-\u003e__ntfs_attr_truncate_vfs()-\u003entfs_non_resident_attr_shrink(). That path frees clusters and calls ntfs_rl_truncate_nolock() without ni-\u003erunlist.lock. No remote protocol supplies the input; it is a locking defect on a well-formed volume.\nAC:L - The attacker runs both sides of the race: one thread dirties and fsync()s the file, driving ntfs_writeback_range()-\u003e__ntfs_write_iomap_begin(), which walks and merges ni-\u003erunlist.rl under runlist.lock. Another thread repeatedly ftruncate()s the same file, reallocating or kvfree()ing rl without that lock. It can be retried at will.\nPR:L - The attacker only needs an ordinary local account with write permission on a file in an already-mounted NTFS volume, as needed for setattr ATTR_SIZE and writeback. No capability is checked on this path.\nUI:N - No crafted image or victim mount is needed. The race works against any legitimately mounted NTFS volume, using only the attacker\u0027s own truncate and write/fsync calls on a file the attacker can already write.\nS:U - The memory corruption stays within the kernel\u0027s own security authority. No guest/host, IOMMU or sandbox boundary is crossed.\nC:H - ntfs_rl_truncate_nolock() reallocates or frees the kvmalloc\u0027d runlist array while writeback still holds a pointer into it, so the freed slab can be reclaimed and its contents read back as cluster mappings (LCNs). That can direct I/O at arbitrary disk clusters, and is a use-after-free read of kernel memory.\nI:H - The writeback path merges new runs into the freed or reallocated runlist array (heap use-after-free write). Concurrently, ntfs_cluster_free() and the shrink update the shared runlist and on-disk mapping pairs without serialization, corrupting both kernel heap memory and filesystem metadata.\nA:H - Losing the race leads to a KASAN use-after-free or oops in the runlist walk, a double kvfree, or a corrupted runlist and mapping pairs that leave the volume inconsistent and can crash later lookups."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:25.955Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/742797432e8c9b0dd54ecc523c185e26b09d79a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/91709ba5d6d709b2b663287b7e871e2c6b480502"
        }
      ],
      "title": "ntfs: protect runlist updates with the runlist lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98315",
    "datePublished": "2026-10-06T08:46:10.751Z",
    "dateReserved": "2026-09-25T10:25:14.339Z",
    "dateUpdated": "2026-10-19T09:17:25.955Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}