CVE-2026-68388 (GCVE-0-2026-68388)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-19 16:34
VLAI
Title
smb/client: handle overlapping allocated ranges in fallocate
Summary
In the Linux kernel, the following vulnerability has been resolved: smb/client: handle overlapping allocated ranges in fallocate smb3_simple_fallocate_range() can skip holes when an allocated range returned by the server starts before the current fallocate offset. The skipped hole is not zero-filled, but fallocate still returns success. A later write to that hole may therefore fail with ENOSPC. The function queries allocated ranges so that it can preserve existing contents and write zeroes only into holes. However, the server may return a range that starts before the current fallocate offset. For example, assume the fallocate request is [100, 400) and the only allocated range returned by the server is [0, 200): Request: [100, 400) Server range: [ 0, 200) allocated Correct: [100, 200) allocated data, skip [200, 400) hole, zero-fill Current: [100, 300) skipped [300, 400) zero-filled afterwards The current code adds the full server range length, 200, to the current offset 100 and moves to 300. As a result, the hole in [200, 300) is skipped without being zero-filled. Fix this by advancing only over the part of the allocated range that overlaps the current fallocate offset. Ignore ranges that end before the current offset and reject ranges whose end offset overflows. This also prevents a malformed range length from causing an out-of-bounds zero-buffer read.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c406bb9ece6ef63721daab106f132ff4b4234e81 , < aeb58a4eb39a7ff4d7782b4f4ada0fda5e0675d2 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < 01719883235507b1585e4c51e320d9a7113dc698 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < f47c7277c03a636fcc3a57969f2dc09567b3c050 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < 437637f5ff3f573b2edf8571de91fb00a21eb4e6 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < 377fe3e583e46369ee1004d5cfe12271d6589a68 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < 7e08ab7a061b17ac1989a225c6afb53f44a86808 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < a4a09e5142835633fffbde68bd0a039ba4d4bf97 (git)
Affected: 966a3cb7c7db786452a87afdc3b48858fc4d4d6b , < b09ae45d85dc816987a71db9eebc54b0ae288e94 (git)
Affected: 2f9f4a2d0e6fcf0673ed51195e06e47abe966900 (git)
Affected: 5e397c943424de94879830e72c95f2679e297a76 (git)
Affected: 5.10.50 , < 5.10.265 (semver)
Affected: 5.12.17 , < 5.13 (semver)
Affected: 5.13.2 , < 5.14 (semver)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: handle overlapping allocated ranges in fallocate\n\nsmb3_simple_fallocate_range() can skip holes when an allocated range\nreturned by the server starts before the current fallocate offset. The\nskipped hole is not zero-filled, but fallocate still returns success. A\nlater write to that hole may therefore fail with ENOSPC.\n\nThe function queries allocated ranges so that it can preserve existing\ncontents and write zeroes only into holes. However, the server may return\na range that starts before the current fallocate offset.\n\nFor example, assume the fallocate request is [100, 400) and the only\nallocated range returned by the server is [0, 200):\n\n        Request:      [100, 400)\n        Server range: [  0, 200)  allocated\n\n        Correct:\n        [100, 200)    allocated data, skip\n        [200, 400)    hole, zero-fill\n\n        Current:\n        [100, 300)    skipped\n        [300, 400)    zero-filled afterwards\n\nThe current code adds the full server range length, 200, to the current\noffset 100 and moves to 300. As a result, the hole in [200, 300) is\nskipped without being zero-filled.\n\nFix this by advancing only over the part of the allocated range that\noverlaps the current fallocate offset.  Ignore ranges that end before the\ncurrent offset and reject ranges whose end offset overflows.\n\nThis also prevents a malformed range length from causing an out-of-bounds\nzero-buffer read."
        }
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        {
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            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The malformed input is the FSCTL_QUERY_ALLOCATED_RANGES response parsed by the SMB client from a remote peer, so a malicious, compromised, or MITM\u0027d SMB server exploits this purely over the network (TCP/445) against the mounted client.\nAC:L - The server fully and deterministically controls the returned range file_offset/length fields; a single record with bit 63 set in length reliably inflates the loop\u0027s len past the 1 MB buffer with no race, timing, or memory-layout precondition.\nPR:N - The attacker is the remote SMB server (or a network MITM) and needs no account, credentials, or privileges on the victim client; only the pre-existing SMB session the client itself established is required.\nUI:N - Against an already-mounted share (fstab/autofs/systemd automount) a compromised or MITM\u0027d server needs no victim action, and fallocate/posix_fallocate is issued routinely by ordinary applications such as databases, VM images, and download managers.\nS:U - The out-of-bounds read, the corrupted write offsets, and the resulting crash all stay within the kernel of the client host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Because smb3_simple_fallocate_write_range() advances buf by every 64 KB chunk written, the inflated length walks far past the 1 MB kvzalloc\u0027d zero buffer and transmits adjacent kernel heap memory straight back to the attacker\u0027s server, yielding a large sequential kernel memory disclosure.\nI:H - The negative length drives off backwards and lets attacker-chosen offsets be zero-filled over ranges of the victim\u0027s file that hold real data, and the original defect makes fallocate report success while leaving holes unallocated, silently breaking the allocation guarantee applications rely on.\nA:H - The out-of-bounds read walks potentially gigabytes past the allocation and will fault on unmapped or guard pages, causing a kernel oops/panic, while the inflated length also drives an extremely long 64 KB-at-a-time write loop that stalls the caller."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:34:42.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/aeb58a4eb39a7ff4d7782b4f4ada0fda5e0675d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/01719883235507b1585e4c51e320d9a7113dc698"
        },
        {
          "url": "https://git.kernel.org/stable/c/f47c7277c03a636fcc3a57969f2dc09567b3c050"
        },
        {
          "url": "https://git.kernel.org/stable/c/437637f5ff3f573b2edf8571de91fb00a21eb4e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/377fe3e583e46369ee1004d5cfe12271d6589a68"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e08ab7a061b17ac1989a225c6afb53f44a86808"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4a09e5142835633fffbde68bd0a039ba4d4bf97"
        },
        {
          "url": "https://git.kernel.org/stable/c/b09ae45d85dc816987a71db9eebc54b0ae288e94"
        }
      ],
      "title": "smb/client: handle overlapping allocated ranges in fallocate",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68388",
    "datePublished": "2026-08-10T12:04:07.304Z",
    "dateReserved": "2026-07-30T09:28:09.388Z",
    "dateUpdated": "2026-08-19T16:34:42.827Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68388",
      "date": "2026-09-21",
      "epss": "0.00514",
      "percentile": "0.4263"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
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                    "versionType": "semver"
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                    "version": "6.12.101",
                    "versionType": "semver"
                  },
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                    "status": "unaffected",
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                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "7.1.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb/client: handle overlapping allocated ranges in fallocate\n\nsmb3_simple_fallocate_range() can skip holes when an allocated range\nreturned by the server starts before the current fallocate offset. The\nskipped hole is not zero-filled, but fallocate still returns success. A\nlater write to that hole may therefore fail with ENOSPC.\n\nThe function queries allocated ranges so that it can preserve existing\ncontents and write zeroes only into holes. However, the server may return\na range that starts before the current fallocate offset.\n\nFor example, assume the fallocate request is [100, 400) and the only\nallocated range returned by the server is [0, 200):\n\n        Request:      [100, 400)\n        Server range: [  0, 200)  allocated\n\n        Correct:\n        [100, 200)    allocated data, skip\n        [200, 400)    hole, zero-fill\n\n        Current:\n        [100, 300)    skipped\n        [300, 400)    zero-filled afterwards\n\nThe current code adds the full server range length, 200, to the current\noffset 100 and moves to 300. As a result, the hole in [200, 300) is\nskipped without being zero-filled.\n\nFix this by advancing only over the part of the allocated range that\noverlaps the current fallocate offset.  Ignore ranges that end before the\ncurrent offset and reject ranges whose end offset overflows.\n\nThis also prevents a malformed range length from causing an out-of-bounds\nzero-buffer read."
          }
        ],
        "id": "CVE-2026-68388",
        "lastModified": "2026-08-19T17:20:47.397",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-10T13:20:32.060",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/01719883235507b1585e4c51e320d9a7113dc698"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/377fe3e583e46369ee1004d5cfe12271d6589a68"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/437637f5ff3f573b2edf8571de91fb00a21eb4e6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7e08ab7a061b17ac1989a225c6afb53f44a86808"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a4a09e5142835633fffbde68bd0a039ba4d4bf97"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aeb58a4eb39a7ff4d7782b4f4ada0fda5e0675d2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b09ae45d85dc816987a71db9eebc54b0ae288e94"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f47c7277c03a636fcc3a57969f2dc09567b3c050"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T08:12:24+00:00",
      "cve": "CVE-2026-68388",
      "id": "CVE-2026-68388",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb/client: handle overlapping allocated ranges in fallocate",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68388.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:31:00Z",
      "cve": "CVE-2026-68388",
      "id": "CVE-2026-68388",
      "initial_release_date": "2026-08-13T16:22:43Z",
      "product_status:known_affected": "298",
      "product_status:known_not_affected": "39",
      "product_status:recommended": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68388",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68388.json",
      "version": "9"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.