CVE-2026-31716 (GCVE-0-2026-31716)
Vulnerability from cvelistv5
Published
2026-05-01 13:56
Modified
2026-08-05 12:24
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate rec->used in journal-replay file record check check_file_record() validates rec->total against the record size but never validates rec->used. The do_action() journal-replay handlers read rec->used from disk and use it to compute memmove lengths: DeleteAttribute: memmove(attr, ..., used - asize - roff) CreateAttribute: memmove(..., attr, used - roff) change_attr_size: memmove(..., used - PtrOffset(rec, next)) When rec->used is smaller than the offset of a validated attribute, or larger than the record size, these subtractions can underflow allowing us to copy huge amounts of memory in to a 4kb buffer, generally considered a bad idea overall. This requires a corrupted filesystem, which isn't a threat model the kernel really needs to worry about, but checking for such an obvious out-of-bounds value is good to keep things robust, especially on journal replay Fix this up by bounding rec->used correctly. This is much like commit b2bc7c44ed17 ("fs/ntfs3: Fix slab-out-of-bounds read in DeleteIndexEntryRoot") which checked different values in this same switch statement.
References
Impacted products
Vendor Product Version
Linux Linux Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
Version: b46acd6a6a627d876898e1c84d3f84902264b445
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ntfs3/fslog.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
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            },
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.1.175",
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            },
            {
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              "status": "unaffected",
              "version": "6.6.136",
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            },
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              "status": "unaffected",
              "version": "6.12.84",
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            },
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              "status": "unaffected",
              "version": "6.18.25",
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            {
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              "status": "unaffected",
              "version": "7.0.2",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.209",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: validate rec-\u003eused in journal-replay file record check\n\ncheck_file_record() validates rec-\u003etotal against the record size but\nnever validates rec-\u003eused.  The do_action() journal-replay handlers read\nrec-\u003eused from disk and use it to compute memmove lengths:\n\n  DeleteAttribute:    memmove(attr, ..., used - asize - roff)\n  CreateAttribute:    memmove(..., attr, used - roff)\n  change_attr_size:   memmove(..., used - PtrOffset(rec, next))\n\nWhen rec-\u003eused is smaller than the offset of a validated attribute, or\nlarger than the record size, these subtractions can underflow allowing\nus to copy huge amounts of memory in to a 4kb buffer, generally\nconsidered a bad idea overall.\n\nThis requires a corrupted filesystem, which isn\u0027t a threat model the\nkernel really needs to worry about, but checking for such an obvious\nout-of-bounds value is good to keep things robust, especially on journal\nreplay\n\nFix this up by bounding rec-\u003eused correctly.\n\nThis is much like commit b2bc7c44ed17 (\"fs/ntfs3: Fix slab-out-of-bounds\nread in DeleteIndexEntryRoot\") which checked different values in this\nsame switch statement."
        }
      ],
      "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 vulnerable ntfs3 journal replay code is reached when the target mounts or otherwise processes a crafted NTFS block device/image, which is a local filesystem parsing path rather than a network protocol. Physical removable media is one delivery route, but local image/block-device mounting is also reasonable.\nAC:L - The attacker controls the corrupt NTFS metadata and journal records, including the `rec-\u003eused` value and replay operation needed to trigger the underflowed `memmove()` length. No race or external timing condition is required.\nPR:N - Direct self-triggered mounting is gated by `CAP_SYS_ADMIN` and ntfs3 is not user-namespace mountable, but the highest reasonable scenario is an attacker-supplied NTFS image/media mounted by a victim or automounter. In that scenario the attacker needs no privileges on the target.\nUI:R - Exploitation requires the target system or user to mount/process the crafted NTFS filesystem so journal replay runs. The attacker cannot reach this ntfs3 path solely by sending packets.\nS:U - The impact remains within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug creates out-of-bounds memory movement from attacker-controlled on-disk metadata into a small MFT record buffer, and the resulting kernel memory corruption/read exposure is not tightly bounded. When uncertain, the higher impact is appropriate.\nI:H - The underflowed `memmove()` length can overflow/corrupt kernel heap memory adjacent to the MFT record buffer. Such out-of-bounds write-style memory corruption is potentially exploitable for arbitrary modification or code execution.\nA:H - The same oversized `memmove()` can cause kernel heap corruption, faults, oopses, or panics during mount-time journal replay. This is a high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:24:47.538Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8e64d33198b5a0fb14a452708bad844f94f03b2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/1393a467a9607e62123806de7d4c3a3e54e396a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f90b8a1798b750755a9e9aee66678f0a1820bbaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b1613d7e2deda831a97e427d1ea586e50fe1be5"
        },
        {
          "url": "https://git.kernel.org/stable/c/0112e6279420d4005b3d57af36fb45c01b8d0116"
        },
        {
          "url": "https://git.kernel.org/stable/c/f79d0403ea20a81bc29105bba54fbcab54e8c403"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ca0485e4b2e837ebb6cbd4f2451aba665a03e4b"
        }
      ],
      "title": "fs/ntfs3: validate rec-\u003eused in journal-replay file record check",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31716",
    "datePublished": "2026-05-01T13:56:11.263Z",
    "dateReserved": "2026-03-09T15:48:24.133Z",
    "dateUpdated": "2026-08-05T12:24:47.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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