CVE-2026-92503— ext4文件系统 xattr缓存查找ABBA死锁
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： ext4：修复 ext4_xattr_inode_cache_find() 中的 ABBA 死锁 Syzbot 和 stress-ng 报告了 ext4 在执行并发扩展属性（xattr）负载（使用 ea_inode 挂载/格式化选项时）时出现的 ABBA 死锁问题。 死锁发生在运行中的事务线程与驱逐（eviction）线程之间： 任务 1（stress-ng）：持有对共享的 （ ）的引用，并调用 -> 来获取对应的 EA inode。由于该 EA inode 当前正处于
可能的 ATT&CK 技术 1 AI
T1614 · System Location Discovery影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 0a46ef234756dca04623b7591e8ebb3440622f0b< 7720fddd1fe344d14be258a2028f74ebf1569511 |
affected |
0a46ef234756dca04623b7591e8ebb3440622f0b< 03438084a7b8621fb5c762dd3d04cff5f2630fb2 |
affected | ||
0752e7fb549d90c33b4d4186f11cfd25a556d1dd |
affected | ||
737fb7853acd5bc8984f6f42e4bfba3334be8ae1 |
affected | ||
111103907234bffd0a34fba070ad9367de058752 |
affected | ||
6.1.107< 6.2 |
affected | ||
6.6.47< 6.7 |
affected | ||
6.9.7< 6.10 |
affected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-92503 基础信息
漏洞信息
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Vulnerability Title
ext4: fix ABBA deadlock in ext4_xattr_inode_cache_find()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ext4: fix ABBA deadlock in ext4_xattr_inode_cache_find()
Syzbot/stress-ng reported an ABBA deadlock in ext4 when exercising
concurrent xattr workloads (using the ea_inode mount/format option).
The deadlock occurs between the running transaction and the eviction
thread:
- Task 1 (stress-ng): Holds a reference to a shared mbcache_entry (ce)
and calls ext4_xattr_inode_cache_find() -> ext4_iget() to retrieve
the corresponding EA inode. Since the EA inode is currently being
evicted, ext4_iget() blocks in __wait_on_freeing_inode() waiting for
eviction to complete.
- Task 2 (eviction thread): Currently evicting the same EA inode in
ext4_evict_ea_inode(). It calls mb_cache_entry_wait_unused(oe) which
blocks waiting for Task 1 to release the reference to the mbcache_entry.
To break this deadlock, implement a new ext4_iget() configuration flag
named EXT4_IGET_NOWAIT. When set, perform a non-blocking lookup of the
inode via VFS's find_inode_nowait() API.
If the inode is currently being evicted (marked with I_FREEING or
I_WILL_FREE) or created (I_CREATING), or if it is not present in the VFS
inode cache (cache miss), simply skip it (returning -ENOENT) rather than
waiting for eviction/creation to complete, breaking the ABBA cycle.
Since we return -ENOENT immediately on a cache miss, we never attempt to
allocate a new inode or call iget_locked(), completely eliminating any
TOCTOU race window.
If the returned inode is I_NEW, wait for its initialization to clear via
wait_on_new_inode(). If initialization fails and the inode is unhashed
during wait_on_new_inode() waking up (e.g., due to an I/O read error in
another thread), safely drop the reference and return -ENOENT. This
unhashed check is executed unconditionally on all cache-hit pathways to
properly handle concurrent initialization failures.
Finally, standard validation checks (including is_bad_inode,
EXT4_EA_INODE_FL, file_acl, and xattr flags) are executed as normal inside
check_igot_inode() to fully guarantee VFS-layer safety.
In ext4_xattr_inode_cache_find(), invoke ext4_iget() with the new
EXT4_IGET_NOWAIT flag to perform the non-blocking cache search.
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-2026-92503 的公开POC
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|---|
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CVE-2026-92503 补丁与修复 (2)
同批安全公告 · Linux · 2026-09-17 · 共 600 条
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| CVE-2026-90425 | 8.8 HIGH | Linux内核 5.x 内核漏洞 |
显示前 20 条，共 600 条。 查看全部 → →
IV. Related Vulnerabilities
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