CVE-2024-53176— Linux kernel 安全漏洞
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。
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smb子系统中在卸载过程中未能确保所有缓存目录实例释放它们的dentry。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | ebe98f1447bbccf8228335c62d86af02a0ed23f7< 73934e535cffbda1490fa97d82690a0f9aa73e94 |
affected |
ebe98f1447bbccf8228335c62d86af02a0ed23f7< ff4528bbc82d0d90073751f7b49e7b9e9c7e5638 |
affected | ||
ebe98f1447bbccf8228335c62d86af02a0ed23f7< 548812afd96982a76a93ba76c0582ea670c40d9e |
affected | ||
ebe98f1447bbccf8228335c62d86af02a0ed23f7< 3fa640d035e5ae526769615c35cb9ed4be6e3662 |
affected | ||
6.1 |
affected | ||
< 6.1 |
unaffected | ||
6.6.64≤ 6.6.* |
unaffected | ||
6.11.11≤ 6.11.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2024-53176 基础信息
漏洞信息
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Vulnerability Title
smb: During unmount, ensure all cached dir instances drop their dentry
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
smb: During unmount, ensure all cached dir instances drop their dentry
The unmount process (cifs_kill_sb() calling close_all_cached_dirs()) can
race with various cached directory operations, which ultimately results
in dentries not being dropped and these kernel BUGs:
BUG: Dentry ffff88814f37e358{i=1000000000080,n=/} still in use (2) [unmount of cifs cifs]
VFS: Busy inodes after unmount of cifs (cifs)
------------[ cut here ]------------
kernel BUG at fs/super.c:661!
This happens when a cfid is in the process of being cleaned up when, and
has been removed from the cfids->entries list, including:
- Receiving a lease break from the server
- Server reconnection triggers invalidate_all_cached_dirs(), which
removes all the cfids from the list
- The laundromat thread decides to expire an old cfid.
To solve these problems, dropping the dentry is done in queued work done
in a newly-added cfid_put_wq workqueue, and close_all_cached_dirs()
flushes that workqueue after it drops all the dentries of which it's
aware. This is a global workqueue (rather than scoped to a mount), but
the queued work is minimal.
The final cleanup work for cleaning up a cfid is performed via work
queued in the serverclose_wq workqueue; this is done separate from
dropping the dentries so that close_all_cached_dirs() doesn't block on
any server operations.
Both of these queued works expect to invoked with a cfid reference and
a tcon reference to avoid those objects from being freed while the work
is ongoing.
While we're here, add proper locking to close_all_cached_dirs(), and
locking around the freeing of cfid->dentry.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smb子系统中在卸载过程中未能确保所有缓存目录实例释放它们的dentry。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2024-53176 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-53176 补丁与修复 (4)
同批安全公告 · Linux · 2024-12-27 · 共 221 条
| CVE-2024-53186 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-53179 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-53169 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-56645 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-53209 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-56656 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-53177 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-53206 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-56640 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-56591 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56626 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56669 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-53237 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-53224 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56653 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56651 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56627 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56538 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56624 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-56628 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 221 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-53176
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