Vulnerability-Lookup

FKIE_CVE-2026-98318

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-07 07:17

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: validate absolute native symlink targets before NT fixups With symlinkroot unset, an absolute target is copied without conversion to an NT drive path. Later code still assumes an NT prefix is present when modifying the target and calculating the print name length. For "/ab", this causes two failures: sym[5] and path[5] are written past their allocations, and plen -= 2 * poff subtracts an assumed 8-byte prefix from a 6-byte UTF-16 target, wrapping u16 plen to 65534. That underflow causes another overflow: memcpy() copies 65534 bytes into a 24-byte buffer. A user with write access to a mounted share can trigger these bugs with default settings. Validate the NT drive prefix, including an ASCII drive letter, before accessing fixed offsets or subtracting the prefix length.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/23c240d9509e15f72e4112fc95f0160ab32ec430
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6913ff607c2bc8694193e1fcc40bf16d75f35f16

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6913ff607c2bc8694193e1fcc40bf16d75f35f16",
              "status": "affected",
              "version": "3363da82e02f1bddc54faa92ea430c6532e2cd2e",
              "versionType": "git"
            },
            {
              "lessThan": "23c240d9509e15f72e4112fc95f0160ab32ec430",
              "status": "affected",
              "version": "3363da82e02f1bddc54faa92ea430c6532e2cd2e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b6ea7b6c6be65149ab6b8e37a9dd1671f76add1b",
              "versionType": "git"
            },
            {
              "lessThan": "6.16",
              "status": "affected",
              "version": "6.15.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "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: validate absolute native symlink targets before NT fixups\n\nWith symlinkroot unset, an absolute target is copied without conversion\nto an NT drive path. Later code still assumes an NT prefix is present\nwhen modifying the target and calculating the print name length.\n\nFor \"/ab\", this causes two failures: sym[5] and path[5] are written\npast their allocations, and plen -= 2 * poff subtracts an assumed\n8-byte prefix from a 6-byte UTF-16 target, wrapping u16 plen to 65534.\nThat underflow causes another overflow: memcpy() copies 65534 bytes\ninto a 24-byte buffer. A user with write access to a mounted share\ncan trigger these bugs with default settings.\n\nValidate the NT drive prefix, including an ASCII drive letter, before\naccessing fixed offsets or subtracting the prefix length."
    }
  ],
  "id": "CVE-2026-98318",
  "lastModified": "2026-10-07T07:17:08.727",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-06T09:18:23.670",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/23c240d9509e15f72e4112fc95f0160ab32ec430"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6913ff607c2bc8694193e1fcc40bf16d75f35f16"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-98318 (GCVE-0-2026-98318)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-07 06:50

Title

smb: client: validate absolute native symlink targets before NT fixups

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6664 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/6913ff607c2bc8694…
https://git.kernel.org/stable/c/23c240d9509e15f72…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3363da82e02f1bddc54faa92ea430c6532e2cd2e , < 6913ff607c2bc8694193e1fcc40bf16d75f35f16 (git) Affected: 3363da82e02f1bddc54faa92ea430c6532e2cd2e , < 23c240d9509e15f72e4112fc95f0160ab32ec430 (git) Affected: b6ea7b6c6be65149ab6b8e37a9dd1671f76add1b (git) Affected: 6.15.6 , < 6.16 (semver)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 7.2.8 , ≤ 7.2.* (semver) Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6913ff607c2bc8694193e1fcc40bf16d75f35f16",
              "status": "affected",
              "version": "3363da82e02f1bddc54faa92ea430c6532e2cd2e",
              "versionType": "git"
            },
            {
              "lessThan": "23c240d9509e15f72e4112fc95f0160ab32ec430",
              "status": "affected",
              "version": "3363da82e02f1bddc54faa92ea430c6532e2cd2e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b6ea7b6c6be65149ab6b8e37a9dd1671f76add1b",
              "versionType": "git"
            },
            {
              "lessThan": "6.16",
              "status": "affected",
              "version": "6.15.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc4",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.15.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate absolute native symlink targets before NT fixups\n\nWith symlinkroot unset, an absolute target is copied without conversion\nto an NT drive path. Later code still assumes an NT prefix is present\nwhen modifying the target and calculating the print name length.\n\nFor \"/ab\", this causes two failures: sym[5] and path[5] are written\npast their allocations, and plen -= 2 * poff subtracts an assumed\n8-byte prefix from a 6-byte UTF-16 target, wrapping u16 plen to 65534.\nThat underflow causes another overflow: memcpy() copies 65534 bytes\ninto a 24-byte buffer. A user with write access to a mounted share\ncan trigger these bugs with default settings.\n\nValidate the NT drive prefix, including an ASCII drive letter, before\naccessing fixed offsets or subtracting the prefix length."
        }
      ],
      "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 malformed input is the symlink target string a local user passes to symlink(2) on a CIFS mount (cifs_symlink -\u003e create_reparse_symlink -\u003e create_native_symlink); the SMB server supplies none of the bad data, and the overflow happens before any request is sent.\nAC:L - With default options (reparse_type defaults to NFS so cifs_symlink_type() returns NATIVE, symlinkroot unset) a target like \"/ab\" deterministically triggers the plen underflow; detect_directory_symlink_target() returns 0 for absolute targets, so nothing on the path depends on state outside the attacker\u0027s control.\nPR:L - The attacker needs only an ordinary local account with write access to a directory on an already-mounted CIFS share whose server advertises FILE_SUPPORTS_REPARSE_POINTS; cifs is not mountable from user namespaces, so no further privilege is gained there.\nUI:N - The attacker triggers the bug entirely through their own symlink(2) call; no victim action is needed beyond the share already being mounted.\nS:U - Heap corruption in the CIFS client stays within the local kernel\u0027s security authority; this is ordinary local privilege escalation or crash with no VM or IOMMU boundary crossed.\nC:H - memcpy(buf-\u003ePathBuffer, path+poff, plen) reads 65534 bytes past the small UTF-16 path allocation, and the matching heap overflow can be groomed into read primitives over adjacent slab objects.\nI:H - Out-of-bounds heap writes: sym[5]/path[5] past their allocations, and a 65534-byte memcpy into a 24-byte kzalloc buffer after u16 plen and len wrap, corrupting adjacent slab objects in a way usable for control-flow hijack.\nA:H - The 64 KiB overflow of the kmalloc buffer corrupts large amounts of slab memory and reliably oopses or panics the kernel, and any user with write access to the share can repeat it."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T06:50:00.705Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6913ff607c2bc8694193e1fcc40bf16d75f35f16"
        },
        {
          "url": "https://git.kernel.org/stable/c/23c240d9509e15f72e4112fc95f0160ab32ec430"
        }
      ],
      "title": "smb: client: validate absolute native symlink targets before NT fixups",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98318",
    "datePublished": "2026-10-06T08:46:13.140Z",
    "dateReserved": "2026-09-25T10:25:14.340Z",
    "dateUpdated": "2026-10-07T06:50:00.705Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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