CVE-2026-97557— SMB 客户端 cifs_queue_oplock_break 函数引用计数泄露
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，已修复以下漏洞： smb: 客户端：避免在 cifs_queue_oplock_break() 中泄漏引用计数 cifs_queue_oplock_break() 函数在向 cifs_oplock_break() 任务排队之前，无条件地对目标文件获取一个引用（reference）。只有该工作项（work item）执行完毕后才会再次减少引用计数。 如果在该工作项仍在队列中时又有另一个 oplock 中断到达，queue_work() 将返回 false，且不会将该第二个工作项加入队列。因此，
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 24
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b98749cac4a695f084a5ff076f4510b23e353ecd< 735a3a610136ae10f381d0909dff38e5b5c5f056 |
affected |
b98749cac4a695f084a5ff076f4510b23e353ecd< de2a6bcff2659bea40c7485115b57f0ae189fc01 |
affected | ||
b98749cac4a695f084a5ff076f4510b23e353ecd< af0193bbf1ac8c0f67f972998b0cc629d6116cf6 |
affected | ||
b98749cac4a695f084a5ff076f4510b23e353ecd< 2ed2c29dd9593637cfa25ac1eb23241b20202778 |
affected | ||
b98749cac4a695f084a5ff076f4510b23e353ecd< dfe7b750c7e069873a8a57a11c816831a235618a |
affected | ||
b98749cac4a695f084a5ff076f4510b23e353ecd< 9f2e63f1b2d5fc5b5423424902c091123e220e7e |
affected | ||
2429fcf06d3cb962693868ab0a927c9038f12a2d |
affected | ||
1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12 |
affected | ||
| … +16 条更多 | |||
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一、 漏洞 CVE-2026-97557 基础信息
漏洞信息
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Vulnerability Title
smb: client: avoid leaking refcount in cifs_queue_oplock_break()
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: client: avoid leaking refcount in cifs_queue_oplock_break()
cifs_queue_oplock_break() unconditionally takes a reference on the
target file before queueing cifs_oplock_break(). Only that work item
decreases the reference counter again.
If another oplock break arrives while that work is still queued,
queue_work() will return false and not queue this second work item. As a
result, we will never reach the point to drop the file reference again
and are leaking this reference. This can be triggered when interacting
with a slow-responding server.
As a result, later unmount operations for this file system will fail with
BUG: Dentry ... still in use (1) [unmount of cifs cifs]
VFS: Busy inodes after unmount of cifs (cifs)
kernel BUG at fs/super.c:777!
Fix this by only incrementing the reference count if the work has been
queued successfully. Taking it after queue_work() is safe because all
three callers hold tcon->open_file_lock across the call and
_cifsFileInfo_put() decrements under that same lock, so a worker that
starts the handler in the window cannot drop the reference before it has
been taken.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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-2026-97557 的公开POC
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|---|
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CVE-2026-97557 补丁与修复 (6)
同批安全公告 · Linux · 2026-09-25 · 共 372 条
| CVE-2026-100075 | 9.8 CRITICAL | RDMA/srpt：srpt_alloc_rw_ctxs() 未释放计数器修复 |
| CVE-2026-97957 | 8.8 HIGH | hinic 邮箱段缓冲区溢出漏洞 |
| CVE-2026-97527 | 8.8 HIGH | qla2xxx SCSI驱动程序 NVMe未解决上下文列表竞争条件漏洞 |
| CVE-2026-97528 | 8.8 HIGH | QLogic qla2xxx驱动LS拒绝错误NVMe内存泄漏漏洞 |
| CVE-2026-97555 | 8.8 HIGH | smb客户端：修复DACL所有者/组重写中的堆溢出漏洞 |
| CVE-2026-98115 | 8.8 HIGH | ksmbd 注销期间会话安全排空漏洞 |
| CVE-2026-97525 | 8.2 HIGH | x86/mm/pat：内核页表分裂页表分配漏洞 |
| CVE-2026-98130 | 8.1 HIGH | SCTP定时器启动竞争条件漏洞 |
| CVE-2026-97573 | 8.1 HIGH | bnxt_en 驱动 bnxt_rx_ring_reset 缓冲区分配失败漏洞 |
| CVE-2026-98069 | 8.1 HIGH | Net/RDS rds_conn_shutdown() 快速路径锁获取漏洞 |
| CVE-2026-98070 | 8.1 HIGH | Linux RDS 模块远程代码执行漏洞 |
| CVE-2026-97570 | 8.1 HIGH | bnxt_en: 修复因SW TPA ID绑定问题导致的崩溃漏洞 |
| CVE-2026-97911 | 7.8 HIGH | Ethos-U SRAM区域大小与任务不匹配漏洞 |
| CVE-2026-98116 | 7.8 HIGH | ALSA: PCM内存映射与缓冲区重新分配序列化以修复页面UAF漏洞 |
| CVE-2026-97910 | 7.8 HIGH | ASoC: sprd 验证压缩缓冲区大小与固定分配 |
| CVE-2026-98143 | 7.8 HIGH | Armv8-M Ethos-U55加速器读取U65舍入模式为存储模式漏洞 |
| CVE-2026-97903 | 7.8 HIGH | exit: proc_flush_pid 线程 PID 持引越界漏洞 |
| CVE-2026-97548 | 7.8 HIGH | XFS rtrmap和rtrefcount _maxlevels_ondisk函数漏洞 |
| CVE-2026-97602 | 7.8 HIGH | Linux内核inet模块队列失效前刷新漏洞 |
| CVE-2026-98073 | 7.8 HIGH | Linux 内核网络命名空间更改竞态条件漏洞 |
显示前 20 条，共 372 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-97557
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