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CVE-2026-89703— nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations

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 中为委托（delegations）设置 标志 负责处理管理员撤销的委托（admin-revoked delegations）的 请求，但在释放 之前未设置 标志。 依赖于该标志来检测 是否已处理该委托。若缺少此标志，已释放的委托会通过 被添加到 列表中，导致在 遍历 时发生释放后使用（use-after-free）问题。 在 中， 路径（第 7983 行）已正确设置了 。因此，应将相同的处理模式应用到 中的 路径。

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1487

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a< d832a0587528853d45481d1faf75d4b5d062adaf affected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a< 1e4795766719ffd74b8cf0f2fde4a1350f8326bf affected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a< a6d89032e5c6620d5bb44582a72555ce07bf1c2e affected
8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a< 650d370cfbc66a96dd14d517bd704689b5bda4e5 affected
967faa26f313a62e7bebc55d5b8122eaee43b929 affected
6.11.6< 6.12 affected
6.12 affected
< 6.12 unaffected
… +4 more rows
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I. Basic Information for CVE-2026-89703

Vulnerability Information
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Vulnerability Title
nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: set SC_STATUS_FREED in nfsd4_drop_revoked_stid for delegations nfsd4_drop_revoked_stid() handles FREE_STATEID for admin-revoked delegations but does not set SC_STATUS_FREED before releasing cl_lock. revoke_delegation() uses this flag to detect whether FREE_STATEID has already processed the delegation -- without it, the freed delegation is added to cl_revoked via list_add(), producing a use-after-free when cl_revoked is later traversed in __destroy_client(). The SC_STATUS_REVOKED path in nfsd4_free_stateid() (line 7983) already sets SC_STATUS_FREED correctly. Apply the same pattern to the SC_STATUS_ADMIN_REVOKED path in nfsd4_drop_revoked_stid().
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 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a ~ d832a0587528853d45481d1faf75d4b5d062adaf -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-89703

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III. Intelligence Information for CVE-2026-89703

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Patches & Fixes for CVE-2026-89703 (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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