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CVE-2026-89697— nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()

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 内核中已修复以下漏洞： nfsd：在 中为经过早期校验的 SETATTR 添加 分支会提前调用 ，以便 能够检查 dentry。这导致 跳过了 的调用，使得 在没有挂载写引用的情况下执行。 请在早期的 之后添加缺失的 调用。

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1217 · Browser Information Discovery

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux cc265089ce1b176dde963c74b53593446ee7f99a< 15ca3b64a69caa6194bed8f98a20ed90a11c11dd affected
cc265089ce1b176dde963c74b53593446ee7f99a< 533964d420d385e11b08dd4c56c66ef5dcccaf08 affected
cc265089ce1b176dde963c74b53593446ee7f99a< c4a409b86a92815181a8e9395c6bf1696ad19175 affected
cc265089ce1b176dde963c74b53593446ee7f99a< 4e475be769aa9f7a2c1ce55a2b8592cfccacddcc affected
1cb57d81cf20fe24b9e2e1daf57bfbdc24b77cd8 affected
3.18.46< 3.19 affected
4.2 affected
< 4.2 unaffected
… +4 more rows
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I. Basic Information for CVE-2026-89697

Vulnerability Information
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Vulnerability Title
nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: add fh_want_write() for early-verified SETATTR in nfsd_proc_setattr() The BOTH_TIME_SET branch calls fh_verify() early so setattr_prepare() can inspect the dentry. This causes nfsd_setattr() to skip fh_want_write(), so notify_change() runs without a mount write reference. Add the missing fh_want_write() call after the early fh_verify().
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 cc265089ce1b176dde963c74b53593446ee7f99a ~ 15ca3b64a69caa6194bed8f98a20ed90a11c11dd -
Linux Linux 4.2 -

II. Public POCs for CVE-2026-89697

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III. Intelligence Information for CVE-2026-89697

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Patches & Fixes for CVE-2026-89697 (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

V. Comments for CVE-2026-89697

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