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CVE-2026-89687— nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file

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：确保 不会使用一个未打开的文件 允许在实际上并未打开文件的情况下返回成功。它通过调用 来表明这一点。这意味着 可能会返回一个尚未打开的文件。这种情况极不可能发生，因为 处理程序通常仅对已存在的文件使用 ，而在这种情况下 不会被调用，并且父目录被锁定应当可以防止竞态条件。 但出于充分谨慎的考虑，似乎明智的做法是告知 nfsd 仅在设置了 标志时才使用 返回的文件，该标志表明文件确实已经被打开。

AI Predicted 3.3 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 64a989dbd144e0622371396461b11335459692d2< a95a1cffacd0203100297001719160160f443dd6 affected
64a989dbd144e0622371396461b11335459692d2< 5859cc01fee06a2cd7458905a9593082fbab06e1 affected
7.0 affected
< 7.0 unaffected
7.2.4≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-89687

Vulnerability Information
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Vulnerability Title
nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file ->atomic_open is permitted to return success without actually opening the file. It indicates this by calling finish_no_open(). This means dentry_create() can return a file which hasn't been opened. This is extremely unlikely as ->atomic_open handlers typically use finish_no_open() only for already existing files, and dentry_create() isn't called in that case, and the parent being locked should prevent races. However out of an abundance of caution it seems wise to teach nfsd to only use the file returned by dentry_create() if FMODE_OPENED is set, indicating that it has in fact been opened.
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 64a989dbd144e0622371396461b11335459692d2 ~ a95a1cffacd0203100297001719160160f443dd6 -
Linux Linux 7.0 -

II. Public POCs for CVE-2026-89687

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III. Intelligence Information for CVE-2026-89687

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Patches & Fixes for CVE-2026-89687 (2)

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-2026-89687

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