CVE-2026-89485— Linux lockd 锁释放时文件指针固定漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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 p
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一、 漏洞 CVE-2026-89485 基础信息
漏洞信息
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Vulnerability Title
lockd: pin next file across nlm_inspect_file lock-drop
来源: 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.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-89485 的公开POC
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CVE-2026-89485 其他参考 (4)
同批安全公告 · Linux · 2026-09-11 · 共 431 条
| CVE-2026-89490 | OCFS2 32位内核readdir截断修复 | |
| CVE-2026-89477 | Linux内核 SCTP 重配置空指针引用漏洞 | |
| CVE-2026-89478 | sctp：移除的传输中丢弃数据块 | |
| CVE-2026-89479 | 内核SCTP模块关联删除后仍处理报文 | |
| CVE-2026-89480 | NVMe-TCP 读取字节数异常拒绝漏洞 | |
| CVE-2026-89482 | NVMe-TCP 数据长度误判漏洞 | |
| CVE-2026-89481 | NVMe/TCP 主机内存泄露漏洞 | |
| CVE-2026-89483 | Linux内核 NVMe驱动 逻辑错误 | |
| CVE-2026-89484 | Linux内核lockd 空指针解引用漏洞 | |
| CVE-2026-89486 | IPMI 驱动 _ipmi_destroy_user 释放后使用漏洞 | |
| CVE-2026-89487 | Open vSwitch 数据包丢弃逻辑缺陷 | |
| CVE-2026-89488 | Open vSwitch CT limit 释放后使用漏洞 | |
| CVE-2026-89489 | OpenRISC 内核 or1k_atomic 任意内存访问漏洞 | |
| CVE-2026-89491 | OCFS2集群心跳锁持有期间睡眠漏洞 | |
| CVE-2026-89501 | ring-buffer 子缓冲区调整时未持锁漏洞 | |
| CVE-2026-89498 | Orangefs 双重释放漏洞 | |
| CVE-2026-89499 | ring-buffer 页面交换失败时停止远程读取 | |
| CVE-2026-89500 | ring-buffer 缓冲区读取页修复 | |
| CVE-2026-89497 | Orangefs 调试掩码解析空格处理缺陷 | |
| CVE-2026-89502 | Ring-Buffer 内存释放错误 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-89485
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