CVE-2025-21664— 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dm thin模块中get_first_thin函数未正确使用RCU安全的列表操作。这可能导致内存访问错误或系统崩溃。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | b10ebd34cccae1b431caf1be54919aede2be7cbe< ec037fe8c0d0f6140e3d8a49c7b29cb5582160b8 |
affected |
b10ebd34cccae1b431caf1be54919aede2be7cbe< cd30a3960433ec2db94b3689752fa3c5df44d649 |
affected | ||
b10ebd34cccae1b431caf1be54919aede2be7cbe< 802666a40c71a23542c43a3f87e3a2d0f4e8fe45 |
affected | ||
b10ebd34cccae1b431caf1be54919aede2be7cbe< 12771050b6d059eea096993bf2001da9da9fddff |
affected | ||
b10ebd34cccae1b431caf1be54919aede2be7cbe< 6b305e98de0d225ccebfb225730a9f560d28ecb0 |
affected | ||
b10ebd34cccae1b431caf1be54919aede2be7cbe< cbd0d5ecfa390ac29c5380200147d09c381b2ac6 |
affected | ||
b10ebd34cccae1b431caf1be54919aede2be7cbe< 80f130bfad1dab93b95683fc39b87235682b8f72 |
affected | ||
3.15 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2025-21664 基础信息
漏洞信息
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Vulnerability Title
dm thin: make get_first_thin use rcu-safe list first function
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
dm thin: make get_first_thin use rcu-safe list first function
The documentation in rculist.h explains the absence of list_empty_rcu()
and cautions programmers against relying on a list_empty() ->
list_first() sequence in RCU safe code. This is because each of these
functions performs its own READ_ONCE() of the list head. This can lead
to a situation where the list_empty() sees a valid list entry, but the
subsequent list_first() sees a different view of list head state after a
modification.
In the case of dm-thin, this author had a production box crash from a GP
fault in the process_deferred_bios path. This function saw a valid list
head in get_first_thin() but when it subsequently dereferenced that and
turned it into a thin_c, it got the inside of the struct pool, since the
list was now empty and referring to itself. The kernel on which this
occurred printed both a warning about a refcount_t being saturated, and
a UBSAN error for an out-of-bounds cpuid access in the queued spinlock,
prior to the fault itself. When the resulting kdump was examined, it
was possible to see another thread patiently waiting in thin_dtr's
synchronize_rcu.
The thin_dtr call managed to pull the thin_c out of the active thins
list (and have it be the last entry in the active_thins list) at just
the wrong moment which lead to this crash.
Fortunately, the fix here is straight forward. Switch get_first_thin()
function to use list_first_or_null_rcu() which performs just a single
READ_ONCE() and returns NULL if the list is already empty.
This was run against the devicemapper test suite's thin-provisioning
suites for delete and suspend and no regressions were observed.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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dm thin模块中get_first_thin函数未正确使用RCU安全的列表操作。这可能导致内存访问错误或系统崩溃。
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-2025-21664 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21664 补丁与修复 (7)
同批安全公告 · Linux · 2025-01-21 · 共 25 条
| CVE-2025-21663 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-57932 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2024-57936 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21659 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21661 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-57945 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-57943 | Linux kernel 安全漏洞 | |
| CVE-2024-57946 | Linux kernel 安全漏洞 | |
| CVE-2025-21662 | Linux kernel 安全漏洞 | |
| CVE-2025-21660 | Linux kernel 安全漏洞 | |
| CVE-2025-21658 | Linux kernel 代码问题漏洞 | |
| CVE-2025-21657 | Linux kernel 安全漏洞 | |
| CVE-2025-21656 | Linux kernel 安全漏洞 | |
| CVE-2024-57944 | Linux kernel 代码问题漏洞 | |
| CVE-2024-57930 | Linux kernel 安全漏洞 | |
| CVE-2024-57942 | Linux kernel 安全漏洞 | |
| CVE-2024-57941 | Linux kernel 安全漏洞 | |
| CVE-2024-57940 | Linux kernel 安全漏洞 | |
| CVE-2024-57939 | Linux kernel 安全漏洞 | |
| CVE-2024-57938 | Linux kernel 输入验证错误漏洞 |
显示前 20 条，共 25 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21664
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