CVE-2026-45915 (GCVE-0-2026-45915)
Vulnerability from cvelistv5
Published
2026-05-27 12:17
Modified
2026-05-27 12:17
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 Version: 9a53c3a783c2fa9b969628e65695c11c3e51e673 |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"fs/fat/namei_msdos.c",
"fs/fat/namei_vfat.c"
],
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],
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"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",
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},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.75",
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},
{
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"version": "6.18.14",
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"status": "unaffected",
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},
{
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"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",
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"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"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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