fat: avoid parent link count underflow in rmdir
Summary
| CVE | CVE-2026-45915 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-27 14:17:06 UTC |
| Updated | 2026-05-27 14:48:03 UTC |
| 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. |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.073320000 (date 2026-06-01)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 9894c79fd9466612d0514be157b5c30cd93aa645 git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 cd569b87378b9c33ae13c23d6bb9d205d66f7c4b git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 d3b7ffa90f613938128432c7b2f35b7aa4bdd86b git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 955c5d670b5ae07c78f4345e23a895638db96ce1 git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 17866f8a0822d414cb02e621cf003a7d04396ef8 git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0 git | Not specified |
| CNA | Linux | Linux | affected 9a53c3a783c2fa9b969628e65695c11c3e51e673 8cafcb881364af5ef3a8b9fed4db254054033d8a git | Not specified |
| CNA | Linux | Linux | affected 2.6.19 | Not specified |
| CNA | Linux | Linux | unaffected 2.6.19 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.252 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.202 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.165 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.128 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.75 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.14 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.4 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/17866f8a0822d414cb02e621cf003a7d04396ef8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9894c79fd9466612d0514be157b5c30cd93aa645 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d3b7ffa90f613938128432c7b2f35b7aa4bdd86b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cd569b87378b9c33ae13c23d6bb9d205d66f7c4b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8cafcb881364af5ef3a8b9fed4db254054033d8a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/955c5d670b5ae07c78f4345e23a895638db96ce1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.