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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FAT文件系统中rmdir操作未检查目录i_nlink值，可能导致父目录链接计数下溢，触发WARN_ON。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.16% · P6

Possible ATT&CK Techniques 1 AI

T1034

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9a53c3a783c2fa9b969628e65695c11c3e51e673< 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< 9894c79fd9466612d0514be157b5c30cd93aa645 affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< cd569b87378b9c33ae13c23d6bb9d205d66f7c4b affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< d3b7ffa90f613938128432c7b2f35b7aa4bdd86b affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< 955c5d670b5ae07c78f4345e23a895638db96ce1 affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< 17866f8a0822d414cb02e621cf003a7d04396ef8 affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< d0bb592fa9def2bace90ac8926c0a1d6fa8c1aa0 affected
9a53c3a783c2fa9b969628e65695c11c3e51e673< 8cafcb881364af5ef3a8b9fed4db254054033d8a affected
… +10 more rows
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I. Basic Information for CVE-2026-45915

Vulnerability Information
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Vulnerability Title
fat: avoid parent link count underflow in rmdir
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于FAT文件系统中rmdir操作未检查目录i_nlink值，可能导致父目录链接计数下溢，触发WARN_ON。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 9a53c3a783c2fa9b969628e65695c11c3e51e673 ~ 7fe0de287e931e07cb96ecf1f449b2ebdb0e1115 -
Linux Linux 2.6.19 -

II. Public POCs for CVE-2026-45915

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III. Intelligence Information for CVE-2026-45915

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Patches & Fixes for CVE-2026-45915 (8)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-46039 9.8 CRITICAL rxgk: Fix potential integer overflow in length check
CVE-2026-45898 9.8 CRITICAL RDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-45988 9.8 CRITICAL rxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-45972 9.8 CRITICAL smb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-46043 9.1 CRITICAL RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-45945 8.8 HIGH iommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-46056 8.8 HIGH Bluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2026-45843 8.2 HIGH slip: bound decode() reads against the compressed packet length
CVE-2025-71311 8.2 HIGH fs/ntfs3: Initialize new folios before use
CVE-2026-46037 8.2 HIGH ipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-46099 8.1 HIGH net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-46010 8.1 HIGH rxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-46076 7.9 HIGH KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-45909 7.8 HIGH clk: mediatek: Drop __initconst from gates
CVE-2026-45862 7.8 HIGH iommu/vt-d: Flush cache for PASID table before using it
CVE-2026-45956 7.8 HIGH drm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
CVE-2026-45910 7.8 HIGH RDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-45942 7.8 HIGH ext4: fix e4b bitmap inconsistency reports
CVE-2026-45894 7.8 HIGH iommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-45933 7.8 HIGH bpf: Preserve id of register in sync_linked_regs()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45915

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