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CVE-2026-89701— nfsd: validate nseconds in TIME_DELEG decode paths

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，以下漏洞已得到修复： nfsd：在 TIME_DELEG 解码路径中校验 nseconds 基于 xdrgen 的 TIME_DELEG_ACCESS 和 TIME_DELEG_MODIFY 解码分支会将原始的 uint32_t 类型的 nseconds 直接存入 tv_nsec，而未强制执行 的范围检查。传统的 函数包含此检查，但 TIME_DELEG 路径中缺失该检查。一个格式错误的 timespec 可能通过 传播至磁盘。 已在 （SETATTR 路径）和 （CB_GETATTR 路径）中

AI Predicted 5.0 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 6ae30d6eb26bce02c48c60074b4306270e2434c1< 7e7b93da7fa2e77f977096251899d1410986adf6 affected
6ae30d6eb26bce02c48c60074b4306270e2434c1< 5eb489831a9fd4754f4baf26e6989efb66ce104c affected
6ae30d6eb26bce02c48c60074b4306270e2434c1< 0f4a767340fad392bd656115b8752005518c9065 affected
6.14 affected
< 6.14 unaffected
6.18.50≤ 6.18.* unaffected
7.2.4≤ 7.2.* unaffected
7.3-rc1≤ * unaffected
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I. Basic Information for CVE-2026-89701

Vulnerability Information
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Vulnerability Title
nfsd: validate nseconds in TIME_DELEG decode paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: validate nseconds in TIME_DELEG decode paths The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk. Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).
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 6ae30d6eb26bce02c48c60074b4306270e2434c1 ~ 7e7b93da7fa2e77f977096251899d1410986adf6 -
Linux Linux 6.14 -

II. Public POCs for CVE-2026-89701

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III. Intelligence Information for CVE-2026-89701

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Patches & Fixes for CVE-2026-89701 (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

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