CVE-2026-93252— OCFS2 ocfs2_init_acl() 循环锁依赖漏洞
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： ocfs2：修复 ocfs2_init_acl() 中的循环锁定依赖问题 锁依赖检测工具（lockdep）发出警告，指出 与 之间存在循环锁定依赖： 该死锁涉及两条代码路径： 路径 1（setxattr）： 首先获取 （写锁），然后启动事务，该事务会获取 （读锁）。 路径 2（mkdir/mknod）： 首先启动事务（获取 的读锁），然后调用 ，后者尝试在父目录上获取 （读锁）以获取默认访问控制列表（ACL）。 由于读写信号量（rw_semaphore）存在写者优先机制
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 26
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 16c8d569f5704a84164f30ff01b29879f3438065< 4936d4464d1ae10b5fbba64374085a0dcc060560 |
affected |
16c8d569f5704a84164f30ff01b29879f3438065< caf3056936fb8b5ce92e419cf8b246ce9c437343 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< 5b7b3c50c39ad0dc27e7418981e01c4183273f89 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< 8d88f52fbbbcc18adf4091a955511d0cf605bf11 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< 8931403ee3dcfe8a24a5267efec9d9460ab7a1b5 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< f8747d81aa6d3efe3ee339a9d912ff3ca6e4d758 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< 1222f7a3183b35c0c566899fdaead5c7c4043076 |
affected | ||
16c8d569f5704a84164f30ff01b29879f3438065< bd7c05fb4a4776dff5a87b19008d28458647d15d |
affected | ||
| … +18 条更多 | |||
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一、 漏洞 CVE-2026-93252 基础信息
漏洞信息
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Vulnerability Title
ocfs2: fix circular locking dependency in ocfs2_init_acl()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix circular locking dependency in ocfs2_init_acl()
A lockdep warning indicates a circular locking dependency between
`&oi->ip_xattr_sem` and `&journal->j_trans_barrier`:
WARNING: possible circular locking dependency detected
is trying to acquire lock:
(&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0
fs/ocfs2/acl.c:367
but task is already holding lock:
(&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700
fs/ocfs2/journal.c:369
The deadlock involves two code paths: Path 1 (setxattr) where
`ocfs2_xattr_set()` acquires `ip_xattr_sem` (write) and then starts a
transaction, which acquires `j_trans_barrier` (read); and Path 2
(mkdir/mknod) where `ocfs2_mknod()` starts a transaction (`j_trans_barrier`
read) and then calls `ocfs2_init_acl()`, which attempts to acquire
`ip_xattr_sem` (read) on the parent directory to retrieve the default ACL.
Because rw_semaphores are subject to writer priority, a pending writer on
`j_trans_barrier` (e.g., the journal commit thread) can cause Path 1 to
block, while Path 2 is blocked waiting for Path 1 to release
`ip_xattr_sem`.
The patch fixes the lock ordering by precomputing the ACL state before
starting the OCFS2 transaction, while preserving POSIX ACL storage
semantics and the existing inode/security initialization order. By reading
the parent directory's default ACL and preparing the new inode's ACLs
outside the transaction, `ip_xattr_sem` is always acquired before
`j_trans_barrier`.
`struct ocfs2_acl_state` encapsulates the prepared ACL state, while
`ocfs2_acl_init_prepare()` and `ocfs2_acl_init_release()` avoid code
duplication between `ocfs2_mknod()` and `ocfs2_init_security_and_acl()`.
`ocfs2_calc_xattr_init()` and `ocfs2_init_acl()` use this precomputed
state, removing internal `ip_xattr_sem` acquisition and redundant disk
reads.
Additionally, remove the `ip_xattr_sem` acquisition from
`ocfs2_xattr_set_handle()`. This function is only used while initializing a
new inode that has not yet been inserted into the inode hash or attached to
a dentry, meaning there is no risk of concurrent access and the lock is
unnecessary.
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-2026-93252 的公开POC
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CVE-2026-93252 补丁与修复 (8)
同批安全公告 · Linux · 2026-09-24 · 共 234 条
| CVE-2026-93207 | 9.8 CRITICAL | SUNRPC svcauth_gss_decode_credbody() 存在安全漏洞 |
| CVE-2026-97413 | 9.8 CRITICAL | Linux RDMA/rtrs-srv整数下溢漏洞 |
| CVE-2026-93228 | 9.1 CRITICAL | svcrdma 拒绝段计数为0的写入/回复块漏洞 |
| CVE-2026-93793 | 8.8 HIGH | iwlwifi 驱动 TX_CMD 响应布局验证漏洞 |
| CVE-2026-93799 | 8.8 HIGH | iwlwifi mvm BA窗口状态通知中sta_id验证漏洞 |
| CVE-2026-93790 | 8.8 HIGH | iwlwifi 驱动 BA 通知中 tid_data 越界访问漏洞 |
| CVE-2026-93806 | 8.8 HIGH | wifi: cfg80211 关联响应长度验证漏洞 |
| CVE-2026-97442 | 8.8 HIGH | ath11k无线驱动rx_h_undecap_nwifi无效数据访问漏洞 |
| CVE-2026-97509 | 8.8 HIGH | Thunderbolt 服务期间保持 XDomain 引用漏洞 |
| CVE-2026-97409 | 8.8 HIGH | Linux NVMe-oF目标未初始化前取消请求漏洞 |
| CVE-2026-93280 | 8.8 HIGH | Greybus 音频拓扑边界检查漏洞 |
| CVE-2026-93284 | 8.8 HIGH | drm/pagemap 迁移错误前未解除 dma 映射 |
| CVE-2026-97451 | 8.4 HIGH | ACPICA mid_op 整数溢出漏洞 |
| CVE-2026-97452 | 8.4 HIGH | ACPICA：防止添加无效引用 |
| CVE-2026-97455 | 8.4 HIGH | ACPICA acpi_ds_terminate_control_method 使用后释放漏洞 |
| CVE-2026-97450 | 8.4 HIGH | ACPICA 双重验证处理器对象类型漏洞 |
| CVE-2026-93827 | 8.4 HIGH | virtio-fs 队列设置失败时双重释放漏洞 |
| CVE-2026-97433 | 8.2 HIGH | NVMe 验证 FDP 配置描述符大小 |
| CVE-2026-93221 | 8.1 HIGH | NFS服务端标志位转换为无符号长整型 |
| CVE-2026-93786 | 8.1 HIGH | ksmbd 保持 VFS 继承 POSIX ACL 掩码漏洞 |
显示前 20 条，共 234 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-93252
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