CVE-2026-89652

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: ceph: bound copied dentry name length in NFS export get_name ceph_get_name() copies the MDS-supplied name into the caller's NAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len) and then writes name[rinfo->dname_len] = 0, without checking dname_len against NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply with dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies rde->name / rde->name_len the same unchecked way. Impact: a malicious or compromised Ceph MDS overflows the NAME_MAX name buffer in a client's NFS-export get_name path, a slab out-of-bounds write reported by KASAN. Reachable when a CephFS mount is re-exported over NFS. Add ceph_export_copy_name(), which rejects lengths above NAME_MAX with -ENAMETOOLONG before the copy, and use it in both ceph_get_name() and __get_snap_name().

Severity

CRITICAL

CVSS score

9.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11 20:19:51.283000

Last modified

2026-10-30 13:20:24.690000

View original CVE JSON

{
  "id": "CVE-2026-89652",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:51.283",
  "lastModified": "2026-10-30T13:20:24.690",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: bound copied dentry name length in NFS export get_name\n\nceph_get_name() copies the MDS-supplied name into the caller's\nNAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)\nand then writes name[rinfo->dname_len] = 0, without checking dname_len\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply\nwith dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies\nrde->name / rde->name_len the same unchecked way.\n\nImpact: a malicious or compromised Ceph MDS overflows the NAME_MAX name\nbuffer in a client's NFS-export get_name path, a slab out-of-bounds write\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.\n\nAdd ceph_export_copy_name(), which rejects lengths above NAME_MAX with\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and\n__get_snap_name()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/ceph/export.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "aadfe588ad8032ea99bda259ae7b8d42854f8193",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "3cb09301c30909a7935e9de41f98eeb5ef7e4d40",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "dff3d84d14142ea43ad61ef5d6b4de05ba16ba42",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "a294064e0e0f81ea607b2f019e16888aa1b0a011",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "61d9f27b191b838b96b697ce0bfaee39a138243a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "06fb5e623cdc2402d6bb29be94d9beb9a826ffec",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "19913b4eac4a230dccb548931358398f45dabe4c",
              "lessThan": "eff8013c5a8916613c742ae5a2cc341cb605c0ae",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/ceph/export.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:25:18.510719Z",
          "id": "CVE-2026-89652",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "url": "https://git.kernel.org/stable/c/3cb09301c30909a7935e9de41f98eeb5ef7e4d40",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a",
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    {
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6",
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}