CVE-2026-89723— Linux 内核 nilfs2 堆越界访问漏洞
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。
在 Linux 内核中，以下漏洞已得到修复： nilfs2：修复截断操作后在 中出现的 slab 越界访问问题 Shuangpeng Bai 报告称，在测试过程中，KASAN 检测到 函数中存在 slab 越界错误。 分析表明，在文件被截断后，位于 B 树根节点正下方的一个节点块未被删除，而是以“脏（dirty）”状态残留在 B 树节点缓存中。随后，日志写入器（log writer）检测到该块，并错误地对其调用了 。该函数原本仅设计用于处理直接映射（direct mapping）中的数据块。 缓存中的 B 树节点通
可能的 ATT&CK 技术 1 AI
T1574 · Hijack Execution Flow影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 36a580eb489f54d81a0534974962e732a314b999< 5d3783c451a546373662ee11ec17019273e68034 |
affected |
36a580eb489f54d81a0534974962e732a314b999< 448636c745a3f3b8582a0b8ce718c890a11c0fa9 |
affected | ||
36a580eb489f54d81a0534974962e732a314b999< 28362e8ce51377afdec1782e661e808328a10514 |
affected | ||
36a580eb489f54d81a0534974962e732a314b999< 45662dedb8f272ef7f16e69f13424c4bd0399240 |
affected | ||
2.6.30 |
affected | ||
< 2.6.30 |
unaffected | ||
6.12.109≤ 6.12.* |
unaffected | ||
6.18.50≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-89723 基础信息
漏洞信息
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Vulnerability Title
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation
Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error
in nilfs_direct_propagate() during testing.
Analysis revealed that after truncating a file, a node block immediately
below the B-tree root was not deleted. Instead, it remained in the B-tree
node cache in a dirty state. The log writer subsequently detected this
block and incorrectly invoked nilfs_direct_propagate() on it, which is
designed to handle only data blocks in direct mapping.
B-tree nodes in the cache are managed by virtual block numbers, and their
logical keys typically exceed the range expected by direct mapping.
Consequently, processing such a node as a direct mapping entry triggers
a slab-out-of-bounds access.
The root cause is that when a B-tree mapping collapses into a direct
mapping during truncation, an intermediate node block pointed to by the
root node is left behind as garbage instead of being explicitly deleted.
This resolves the issue by adding a nilfs_btree_discard() operation
to delete the remaining intermediate node block during the conversion.
A 'deform' flag is added to the bop_delete interface to explicitly signal
that the deletion is part of a mapping transformation. This allows the
B-tree mapping implementation to perform the necessary cleanup and
discarding of the residual node structure that would be otherwise be left
orphaned after the transition.
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-2026-89723 的公开POC
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CVE-2026-89723 其他参考 (4)
同批安全公告 · Linux · 2026-09-11 · 共 431 条
| CVE-2026-89491 | OCFS2集群心跳锁持有期间睡眠漏洞 | |
| 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-2026-89485 | Linux lockd 锁释放时文件指针固定漏洞 | |
| 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-2026-89500 | 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-2026-89498 | 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-2026-89496 | ocfs2文件系统COW完成处理缺陷 | |
| CVE-2026-89501 | ring-buffer 子缓冲区调整时未持锁漏洞 |
显示前 20 条，共 431 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-89723
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