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CVE-2026-89683— nfsd: fix dentry ref leak on V4ROOT export filehandle lookup

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.

在 Linux 内核中，已修复以下漏洞： nfsd：修复 V4ROOT 导出文件句柄查找时的 dentry 引用计数泄漏 当 在处理 或 分支中检测到 并跳转到 标签时，会从 泄漏 dentry 引用。 标签处调用了 ，但从未调用 ；同时由于 未被赋值， 也无法补偿该引用。 一个针对 V4ROOT 导出文件系统 ID 的精心构造的 NFSv3 文件句柄，将在每次请求时触发该泄漏。

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444< d493cf57f4c4dae5396cd6ad41e5c209d0615a81 affected
ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444< c1ae0f973bcba5730871e35976a0ab6878fdac34 affected
ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444< 11db8df188b34bdb8c6a3a0bf438e5fc8cd75aca affected
ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444< 6247023fbbec1325029f2d5f2a7cdc0f9f9ea15a affected
6.12 affected
< 6.12 unaffected
6.12.109≤ 6.12.* unaffected
6.18.50≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-89683

Vulnerability Information
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Vulnerability Title
nfsd: fix dentry ref leak on V4ROOT export filehandle lookup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix dentry ref leak on V4ROOT export filehandle lookup nfsd_set_fh_dentry() leaks the dentry reference from exportfs_decode_fh_raw() when the NFS3_FHSIZE or NFS_FHSIZE switch cases detect NFSEXP_V4ROOT and goto out. The out: label calls exp_put() but never dput(dentry), and fhp->fh_dentry was never assigned so fh_put() cannot compensate. A crafted NFSv3 filehandle targeting a V4ROOT export's fsid triggers the leak on every request.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ef7f6c4904d03ccd7478e1ac20ed75f79c4ac444 ~ d493cf57f4c4dae5396cd6ad41e5c209d0615a81 -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-89683

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III. Intelligence Information for CVE-2026-89683

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Patches & Fixes for CVE-2026-89683 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89477 sctp: fix NULL deref on untransmitted RECONF completion
CVE-2026-89478 sctp: drop a chunk if its transport was removed
CVE-2026-89479 sctp: stop processing a packet once its association is deleted
CVE-2026-89480 nvme-tcp: reject a read that transferred too few bytes
CVE-2026-89482 nvme-tcp: do not accept C2HData based on blk_rq_payload_bytes() alone
CVE-2026-89481 nvme-tcp: fix host memory disclosure on R2T for a read command
CVE-2026-89483 nvme: zero the discard fallback page
CVE-2026-89484 lockd: fix NULL dereference on lockowner allocation failure
CVE-2026-89485 lockd: pin next file across nlm_inspect_file lock-drop
CVE-2026-89486 ipmi: Fix use-after-free of cmd_rcvr in _ipmi_destroy_user()
CVE-2026-89487 openvswitch: only skb_tx_error() a packet we are about to drop
CVE-2026-89488 openvswitch: Fix CT limit teardown use-after-free
CVE-2026-89489 openrisc: fix arbitrary kernel memory access via or1k_atomic syscall
CVE-2026-89500 ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
CVE-2026-89497 orangefs: skip leading spaces before parsing client debug masks
CVE-2026-89498 orangefs: fix double-free of trailer_buf on readdir copy failure
CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails
CVE-2026-89496 ocfs2: always run deallocs on copy-on-write completion
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Showing top 20 of 431 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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