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CVE-2026-89715— NFS/localio: fix ref leak on nfs_uuid_add_file failure

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： NFS/localio：修复 nfs_uuid_add_file 失败时的引用泄漏问题 当 与正在拆除 的 发生竞态时，它会返回 ，但并未通过 发布 。随后， 进入其错误分支，仅释放了该槽位文件的引用以及其配对的 引用（加上进入时获取的 引用），而关闭路径实际上是一个空操作（no-op）： 返回的 localio 持有两个引用：一个由调用者持有的 引用（来自 之后的 ），以及一个进入时获取的 引用（来自其首次 ），后者以 的形式嵌入。在失败路径上，这两个引用均发生泄漏：每次

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux fdd015de767977f21892329af5e12276eb80375f< 5215e734bf7cba18237155f8cb2a0accb60ca339 affected
fdd015de767977f21892329af5e12276eb80375f< 9f59b05423ed381f8cdeaaae4bd6778adcb6865c affected
fdd015de767977f21892329af5e12276eb80375f< ca018c19e0ba38975e5ddc3ef8117d5b734313aa affected
55735dc5a0ee0c0fc14cb51e005eae862906a410 affected
7cac8a129fc53497f9ee5d66fca55a245d009b97 affected
6.15.10< 6.16 affected
6.16.1< 6.17 affected
6.17 affected
… +4 more rows
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I. Basic Information for CVE-2026-89715

Vulnerability Information
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Vulnerability Title
NFS/localio: fix ref leak on nfs_uuid_add_file failure
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFS/localio: fix ref leak on nfs_uuid_add_file failure When nfs_uuid_add_file() races with nfs_uuid_put() tearing down uuid->net, it returns -ENXIO without publishing nfl->nfs_uuid via rcu_assign_pointer(). nfs_open_local_fh() then enters its error branch and only releases the slot's file ref and its paired net ref plus its own entry-time net ref, while the close path is a no-op: nfs_close_local_fh() nfs_uuid = rcu_dereference(nfl->nfs_uuid); if (!nfs_uuid) { rcu_read_unlock(); return; } /* always */ nfsd_open_local_fh() returns localio holding a caller-owned +1 nfsd_file reference (from nfsd_file_get() after nfsd_file_acquire_local()) and an entry-time nfsd_net reference (from its first nfsd_net_try_get()) embedded as nf->nf_net. Both are leaked on the failure path, pinning one nfsd_file (and the underlying struct file, dentry, inode) and one nfsd_net_ref per occurrence, which blocks nfsd_net and netns teardown. Fix by releasing the caller-owned file ref and its net ref through the existing helper, using a stack-local RCU pointer so the helper can xchg it out, then returning -ENXIO so callers do not dereference a localio whose slot has been cleared: struct nfsd_file __rcu *tmp = RCU_INITIALIZER(localio); nfs_to_nfsd_file_put_local(pnf); nfs_to_nfsd_file_put_local(&tmp); localio = ERR_PTR(-ENXIO); The trailing nfs_to_nfsd_net_put(net) continues to release the outer net ref, so all three nfsd_net_try_get() increments are balanced on the error branch.
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 fdd015de767977f21892329af5e12276eb80375f ~ 5215e734bf7cba18237155f8cb2a0accb60ca339 -
Linux Linux 6.17 -

II. Public POCs for CVE-2026-89715

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III. Intelligence Information for CVE-2026-89715

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Patches & Fixes for CVE-2026-89715 (3)

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

V. Comments for CVE-2026-89715

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