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CVE-2026-89668— nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd()

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，已修复如下漏洞： nfsd：在 中将 移至 之后 在 中， 原本在 之前执行。 如果 slab 内存分配失败，代码中直接执行 会跳过 ，导致遗留孤立的 debugfs 文件，其中包含指向已释放模块文本段的陈旧 指针。 通过将 移至 slab 初始化成功之后，使得早期的 无需清理任何 debugfs 状态。 由于现在 debugfs 是两者中较晚初始化的部分，因此同时更新了错误处理路径，使其遵循逆序初始化（LIFO）顺序：在 的错误路径和 中，在调用 之前先调用 。nfsd 的 debugfs

Possible ATT&CK Techniques 1 AI

T1531 · Account Access Removal

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 9fe5ea760e64f04412dbed51645a0dac7220d40a< 4ae5d7490ae6a7b83b3d607f88c499f4f85e753a affected
9fe5ea760e64f04412dbed51645a0dac7220d40a< ab43ff94f5dfc2b6a080b167b69855eb7655c98b affected
9fe5ea760e64f04412dbed51645a0dac7220d40a< 2c390c8a1764d67095fe444401861fac4c049362 affected
6.16 affected
< 6.16 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-2026-89668

Vulnerability Information
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Vulnerability Title
nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd() nfsd_debugfs_init() runs before nfsd4_init_slabs() in init_nfsd(). If the slab allocation fails, the bare "return retval" bypasses nfsd_debugfs_exit(), leaving orphan debugfs files with stale fops pointers into the freed module text. Move nfsd_debugfs_init() to after the slab init succeeds, so the early return has no debugfs state to clean up. Since debugfs is now the more recently initialized of the two, also update the unwind paths to match reverse-initialization (LIFO) order: run nfsd_debugfs_exit() before nfsd4_free_slabs() in both the init_nfsd() error path and exit_nfsd(). The nfsd debugfs files only reference module-global state and have no dependency on the slab caches, so that reordering is a cleanup with no functional change.
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 9fe5ea760e64f04412dbed51645a0dac7220d40a ~ 4ae5d7490ae6a7b83b3d607f88c499f4f85e753a -
Linux Linux 6.16 -

II. Public POCs for CVE-2026-89668

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III. Intelligence Information for CVE-2026-89668

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Patches & Fixes for CVE-2026-89668 (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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