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CVE-2026-89710— NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path

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： NFSv4.1：修复 pnfs_layout_process() 的 forget 路径中的布局段泄漏问题 当服务器返回一个新的布局 stateid，而系统中仍保留有一个有效 stateid 时， 会对栈上 列表调用 ，然后跳转到 。当段的引用计数降为零时， 会将其从 中解链，并将其移动到 ；对于空闲的缓存段，布局头（layout header）持有唯一的引用，因此在下一次引用计数递减时即会触发此行为。 然而， 从未清空（drain） —— 只有成功路径才会调用 。 提交

AI Predicted 5.5 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1217 · Browser Information Discovery

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux fb700ef026766c95578aafc0db1b208946e7ad4f< 7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2 affected
fb700ef026766c95578aafc0db1b208946e7ad4f< 36e3f13bf0728f4ce11ee8904cec82a783222f62 affected
fb700ef026766c95578aafc0db1b208946e7ad4f< 32ac1b0b7f1cfa0d1a1faf9c72f4154046101070 affected
fb700ef026766c95578aafc0db1b208946e7ad4f< ee5a386cfe60f3f8286de16a9db8e1a08f0bc124 affected
5.13 affected
< 5.13 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-2026-89710

Vulnerability Information
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Vulnerability Title
NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path When the server returns a new layout stateid while a valid one is still held, pnfs_layout_process() calls pnfs_mark_matching_lsegs_return() on the on-stack free_me list and jumps to out_forget. Segments whose reference count drops to zero are unlinked from lo->plh_segs and moved to free_me by mark_lseg_invalid(); for an idle cached segment the layout header holds the only reference, so this happens on the first decrement. out_forget never drains free_me -- only the success path calls pnfs_free_lseg_list(). Commit 814b84971388 ("pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()") added the drain; commit 08bd8dbe8882 ("pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()") removed it while switching the destination to lo->plh_return_segs, which is drained elsewhere. Commit fb700ef02676 ("NFSv4.1: Simplify layout return in pnfs_layout_process()") switched the destination back to free_me without restoring the drain. Restore the pnfs_free_lseg_list() call.
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 fb700ef026766c95578aafc0db1b208946e7ad4f ~ 7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2 -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-89710

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III. Intelligence Information for CVE-2026-89710

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Patches & Fixes for CVE-2026-89710 (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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