CVE-2026-45915 | fat: avoid parent link count underflow in rmdir

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.

Published: 2026-05-27 Last update: 2026-05-27 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Conclusion & alert: CVE-2026-45915 is rated Low Risk (7.4/100): low exploitation likelihood (EPSS 0.02%). Mandatory action: Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-45915

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-28 0.02%

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-45915

CVSS metrics for this CVE.

No CVSS data in dataset for this CVE.

Weakness enumeration for CVE-2026-45915

GitHub Security Advisory for CVE-2026-45915

GHSA-2qhg-8p2v-wf99 · Severity: unknown — In the Linux kernel, the following vulnerability has been resolved: fat: avoid parent link count...

OS Trackers for CVE-2026-45915

vendor priority summary link
debian not yet assigned CVE-2026-45915 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-45915
redhat low https://access.redhat.com/security/cve/CVE-2026-45915
suse medium https://www.suse.com/security/cve/CVE-2026-45915/
ubuntu medium CVE-2026-45915 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1422 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): DNE 1024, ignored 173, needed 112, released 84, pending 18, not-affected 10, needs-triage 1. https://ubuntu.com/security/CVE-2026-45915

Affected software / configurations for CVE-2026-45915

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-45915

cvelogic Threat Intelligence