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CVE-2026-89676— nfsd: fix stale s2s_cp_stateids IDR entry for async COPY

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.

以下是该漏洞描述的中文翻译： 在 Linux 内核中，以下漏洞已得到修复： nfsd：修复异步 COPY 中过期的 s2s_cp_stateids IDR 表项 对于异步 COPY 操作， 在调用 之前调用了 。因此， IDR 表指向了 ，即位于每个请求线程私有（per-rqstp）COMPOUND 缓冲区中的内存。该缓冲区会被下一个请求复用。 仅将状态 ID 的值复制到 结构中，导致 IDR 表项在整个后台 COPY 操作期间悬空指向这个临时缓冲区。 随后，任何 IDR 遍历器（IDR walker）解引用该被复

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux e0639dc5805a9d4faaa2c07ad98fa853b9529dd3< 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a affected
e0639dc5805a9d4faaa2c07ad98fa853b9529dd3< 14b978e8d05ce018d0afbeb6611833ef91713a02 affected
e0639dc5805a9d4faaa2c07ad98fa853b9529dd3< d0beaee498e11880e72826026db0e9c9890fc114 affected
4.20 affected
< 4.20 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-2026-89676

Vulnerability Information
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Vulnerability Title
nfsd: fix stale s2s_cp_stateids IDR entry for async COPY
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix stale s2s_cp_stateids IDR entry for async COPY For an async COPY, nfsd4_copy() called nfs4_init_copy_state() before dup_copy_fields(), so the s2s_cp_stateids IDR was pointed at &u->copy->cp_stateid -- memory in the per-rqstp COMPOUND buffer that is reused by the next request. dup_copy_fields() copies only the value into async_copy, so the IDR slot dangled at the transient buffer for the whole background copy. Any IDR walker then dereferences reused request memory: the laundromat reads cs_type from it and, if the bytes look like an expired NFS4_COPYNOTIFY_STID, follows into refcount_dec()/idr_remove()/kfree() on garbage; manage_cpntf_state() has the same exposure via idr_find(). Duplicate the fields first, then register the stateid on the stable async_copy. result->cb_stateid is unchanged.
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 e0639dc5805a9d4faaa2c07ad98fa853b9529dd3 ~ 9b4e5e9ba5ae13808b8a6d229d87c54611ba0e7a -
Linux Linux 4.20 -

II. Public POCs for CVE-2026-89676

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III. Intelligence Information for CVE-2026-89676

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Patches & Fixes for CVE-2026-89676 (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

V. Comments for CVE-2026-89676

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