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CVE-2026-89669— nfsd: initialize copy-notify stateid before publishing it

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，以下漏洞已修复： nfsd：在发布 cpntf stateid 之前完成初始化 在 已将 cpntf stateid 插入到 IDR 和父级的 之后，才完成 状态的初始化，此时 （仅持有成员资格引用），调用者并未持有额外引用。若此时有一个竞争性的 请求（其 被构造为等于 ，且 可被猜测），则可能进入 并释放该条目，导致调用者随后读取 以及写入 / 时发生“释放后使用”（use-after-free）。此外，拥有者的 clientid 也是在条目发布之后才记录的，因此在该时间窗口内无法作为所有

AI Predicted 5.0 Difficulty: Hard

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 624322f1adc58acd0b69f77a6ddc764207e97241< e08a3dcaca0505f861e344a387f37f94d95dbdc2 affected
624322f1adc58acd0b69f77a6ddc764207e97241< a4d7fedcaaf33e60a01e53eafca9041ef966212f affected
624322f1adc58acd0b69f77a6ddc764207e97241< 4cdef96892f4fa6e70c405b6e8f2fd6972f3b64b affected
624322f1adc58acd0b69f77a6ddc764207e97241< 129643893b79f8a3c6b72045f933fbab5ee424ca 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-2026-89669

Vulnerability Information
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Vulnerability Title
nfsd: initialize copy-notify stateid before publishing it
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: initialize copy-notify stateid before publishing it nfsd4_copy_notify() finished initializing the cpntf state after nfs4_alloc_init_cpntf_state() had already linked it into the s2s_cp_stateids IDR and the parent's sc_cp_list, with cs_count == 1 (the membership reference) and none held for the caller. A racing OFFLOAD_CANCEL (crafted cl_id == nn->s2s_cp_cl_id plus the guessable so_id) could reach manage_cpntf_state() and free the entry, turning the caller's subsequent cpn_cnr_stateid read and cp_p_stateid/cp_p_clid writes into use-after-free. The owning clientid was also only recorded after publication, so it could not gate an ownership check in that window. Record cp_p_stateid and cp_p_clid inside nfs4_alloc_init_cpntf_state() before nfs4_init_cp_state() publishes the entry, and return it with an extra reference. The caller reads the stateid under that reference and drops it with nfs4_put_cpntf_state(); on a late error the laundromat reaps 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 624322f1adc58acd0b69f77a6ddc764207e97241 ~ e08a3dcaca0505f861e344a387f37f94d95dbdc2 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-89669

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III. Intelligence Information for CVE-2026-89669

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Other References for CVE-2026-89669 (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-2026-89669

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