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CVE-2026-45915

📛 CVE Title

fat: avoid parent link count underflow in rmdir

⬇ Download JSON ⚠ View as Threat

Description

In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count underflow in rmdir Corrupted FAT images can leave a directory inode with an incorrect i_nlink (e.g. 2 even though subdirectories exist). rmdir then unconditionally calls drop_nlink(dir) and can drive i_nlink to 0, triggering the WARN_ON in drop_nlink(). Add a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the parent link count when it is at least 3, otherwise report a filesystem error.

Overview

State
PUBLISHED
Assigner (CNA)
Linux
CVSS severity
high
CVSS score
CVSS 8.4 / 10 8.4 8.4 / 10
CVSS vector
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Effective score
8.4 / 10 HIGH source: CNA overview
CWE(s)
—
Reserved
2026-05-13
Published
2026-05-27 12:17 UTC
Last updated
2026-05-27 12:17 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/45xxx/CVE-2026-45915.json
Linked Threat
CVE-2026-45915 — CVE-2026-45915

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-27 14:17:06 UTC
NVD last modified
2026-06-24 17:23:37 UTC
NVD CVSS v3.1
CVSS 5.5 / 10 5.5 5.5 / 10 MEDIUM source: nvd@nist.gov
NVD CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
1.8 / 10
Impact subscore
3.6 / 10
EPSS score
0.0016 (probability of exploitation in next 30 days)
EPSS percentile
5.65% vs all CVEs — higher = more likely to be exploited, as of 2026-07-31

NVD / KEV / EPSS data refreshed 2026-08-01 00:00 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-32381
Assigner
Linux
Published
May 27, 2026, 12:17:30 PM
Updated
May 27, 2026, 12:17:30 PM
EUVD base score
0.0 / 10
EUVD-reported EPSS
0.1600
Vendors
Linux
Products
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <d3b7ffa90f613938128432c7b2f35b7aa4bdd86b)
Linux (patch: 6.6.128)
Linux (patch: 6.12.75)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <8cafcb881364af5ef3a8b9fed4db254054033d8a)
Linux (patch: 5.15.202)
Linux (patch: 6.1.165)
Linux (2.6.19)
Linux (patch: 5.10.252)
Linux (patch: 6.19.4)
Linux (patch: 0)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <9894c79fd9466612d0514be157b5c30cd93aa645)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <cd569b87378b9c33ae13c23d6bb9d205d66f7c4b)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <17866f8a0822d414cb02e621cf003a7d04396ef8)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <7fe0de287e931e07cb96ecf1f449b2ebdb0e1115)
Linux (patch: 6.18.14)
Linux (9a53c3a783c2fa9b969628e65695c11c3e51e673 <955c5d670b5ae07c78f4345e23a895638db96ce1)
Linux (patch: 7.0)
Aliases
GHSA-2qhg-8p2v-wf99

ENISA description: In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count underflow in rmdir Corrupted FAT images can leave a directory inode with an incorrect i_nlink (e.g. 2 even though subdirectories exist). rmdir then unconditionally calls drop_nlink(dir) and can drive i_nlink to 0, triggering the WARN_ON in drop_nlink(). Add a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the parent link count when it is at least 3, otherwise report a filesystem error.

EUVD references (8)

Affected products (2)
VendorProductVersionsPlatforms
Linux Linux 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected), 9a53c3a783c2fa9b969628e65695c11c3e51e673 (affected) —
Linux Linux 2.6.19 (affected), 0 (unaffected), 5.10.252 (unaffected), 5.15.202 (unaffected), 6.1.165 (unaffected), 6.6.128 (unaffected), 6.12.75 (unaffected), 6.18.14 (unaffected), 6.19.4 (unaffected), 7.0 (unaffected) —

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor references (8)

References embedded in the original CVE record by the assigning CNA.

Web references (11)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (8)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (19)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-45915.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/fat/namei_msdos.c",
            "fs/fat/namei_vfat.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7fe0de287e931e07cb96ecf1f449b2ebdb0e1115",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "9894c79fd9466612d0514be157b5c30cd93aa645",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "cd569b87378b9c33ae13c23d6bb9d205d66f7c4b",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "d3b7ffa90f613938128432c7b2f35b7aa4bdd86b",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "955c5d670b5ae07c78f4345e23a895638db96ce1",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "17866f8a0822d414cb02e621cf003a7d04396ef8",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            },
            {
              "lessThan": "8cafcb881364af5ef3a8b9fed4db254054033d8a",
              "status": "affected",
              "version": "9a53c3a783c2fa9b969628e65695c11c3e51e673",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/fat/namei_msdos.c",
            "fs/fat/namei_vfat.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.19"
            },
            {
              "lessThan": "2.6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfat: avoid parent link count underflow in rmdir\n\nCorrupted FAT images can leave a directory inode with an incorrect\ni_nlink (e.g. 2 even though subdirectories exist). rmdir then\nunconditionally calls drop_nlink(dir) and can drive i_nlink to 0,\ntriggering the WARN_ON in drop_nlink().\n\nAdd a sanity check in vfat_rmdir() and msdos_rmdir(): only drop the\nparent link count when it is at least 3, otherwise report a filesystem\nerror."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:30.699Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115"
        },
        {
          "url": "https://git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b"
        },
        {
          "url": "https://git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1"
        },
        {
          "url": "https://git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a"
        }
      ],
      "title": "fat: avoid parent link count underflow in rmdir",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45915",
    "datePublished": "2026-05-27T12:17:30.699Z",
    "dateReserved": "2026-05-13T15:03:33.085Z",
    "dateUpdated": "2026-05-27T12:17:30.699Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}