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CVE-2026-89694— nfsd: check client ownership when cancelling a copy-notify stateid

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：在取消复制通知（copy-notify）stateid 时检查客户端所有权 在 OFFLOAD_CANCEL 路径中（clp != NULL）， 函数在释放目标 cpntf 状态时未检查所有权。由于查找键 是循环分配的（可被推测），且嵌入的 clientid 是固定的每网络命名空间值 ，因此任何经过身份验证的 NFSv4.2 客户端都可以取消并释放其他客户端的复制通知 stateid。 修复方式： 将状态结构中记录的创建客户端 ID（ ）与请求客户端的 进行比较；

AI Predicted 5.5 Difficulty: Hard

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux ce0887ac96d35c7105090e166bb0807dc0a0e838< b1eca07303594ca27f5dc360a6946bd7e1f5b04c affected
ce0887ac96d35c7105090e166bb0807dc0a0e838< b42dc26a14b4ad5d6daaada11ec4c70744141c25 affected
ce0887ac96d35c7105090e166bb0807dc0a0e838< d801906165cb5cc250d5cbe44935594e170be3e2 affected
ce0887ac96d35c7105090e166bb0807dc0a0e838< 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf affected
5.6 affected
< 5.6 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-2026-89694

Vulnerability Information
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Vulnerability Title
nfsd: check client ownership when cancelling a copy-notify stateid
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: check client ownership when cancelling a copy-notify stateid On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid. Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry.
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 ce0887ac96d35c7105090e166bb0807dc0a0e838 ~ b1eca07303594ca27f5dc360a6946bd7e1f5b04c -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-89694

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III. Intelligence Information for CVE-2026-89694

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Patches & Fixes for CVE-2026-89694 (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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