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CVE-2026-89485— lockd: pin next file across nlm_inspect_file lock-drop

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，以下漏洞已得到修复： lockd：在 nlm_inspect_file 释放锁期间固定（pin）下一个文件 在调用 前后通过 固定当前文件，并在 期间保持固定；但保存的“下一个”文件指针并未被固定。一个并发的 可能在解锁窗口期间释放（kfree）下一个文件，导致迭代器在下一轮循环中引用已释放的内存（use-after-free）。 修复方法： 1. 在释放锁之前，同时固定“当前”和“下一个”文件指针。 2. 在每次迭代结束时，通过交换已固定的游标来推进遍历，确保“下一个”文件在解锁期间始终存

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 01df9c5e918ae5559f2d96da0143f8bfbb9e6171< c24bdb7df2f34bdc38ca8a73796f5acb40f1830c affected
01df9c5e918ae5559f2d96da0143f8bfbb9e6171< 41f0a6d31615fcae261bf28a0aa50050dc93a401 affected
01df9c5e918ae5559f2d96da0143f8bfbb9e6171< e999a88133654c6dfc68487fb49da5f20dfa2d4f affected
01df9c5e918ae5559f2d96da0143f8bfbb9e6171< 526c49cff3f72c3ec74752016380c7567040581b affected
2.6.18 affected
< 2.6.18 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-2026-89485

Vulnerability Information
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Vulnerability Title
lockd: pin next file across nlm_inspect_file lock-drop
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: lockd: pin next file across nlm_inspect_file lock-drop nlm_traverse_files() pins the current file with f_count++ across a mutex_unlock for nlm_inspect_file(), but nothing pins the saved next pointer. A concurrent nlm_release_file() can kfree the next file during the unlock window, and the iterator dereferences freed memory on the next loop step. Pin both current and next before the lock-drop. Advance by swapping the pinned cursors at the end of each iteration so next is always held alive across the unlock. Always call nlm_file_release() after dropping the iteration pin, regardless of whether the file matched the predicate. Use nlm_file_inuse(), which does a live walk of the inode lock list, rather than the cached f_locks field, so skipped files that never ran nlm_inspect_file() are evaluated correctly. Because every file in a hash bucket is now pinned and released, files skipped by the is_failover_file predicate that have no locks, blocks, shares, or external references are deleted during traversal. The old code never evaluated skipped files for cleanup. The new behavior is intentional: such files are stale and should not persist in the table.
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 01df9c5e918ae5559f2d96da0143f8bfbb9e6171 ~ c24bdb7df2f34bdc38ca8a73796f5acb40f1830c -
Linux Linux 2.6.18 -

II. Public POCs for CVE-2026-89485

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III. Intelligence Information for CVE-2026-89485

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Other References for CVE-2026-89485 (4)

Same Patch Batch · Linux · 2026-09-11 · 431 CVEs total

CVE-2026-89490 ocfs2: fix readdir position truncation on 32-bit kernels
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-2026-89486 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-2026-89491 ocfs2: cluster: don't sleep while holding o2hb_live_lock in o2hb_region_pin()
CVE-2026-89501 ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
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-2026-89500 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-2026-89502 ring-buffer: Free cpu_buffer::free_page with subbuf_order

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-2026-89485

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