CVE-2026-45949— 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hwrng核心模块中hwrng_fill的清理与线程停止存在竞争条件，可能导致释放后重用。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | be4000bc4644d027c519b6361f5ae3bbfc52c347< d5b7730f06994499632026c30e38e0317c4569e2 |
affected |
be4000bc4644d027c519b6361f5ae3bbfc52c347< dcf416eb88eafe1e3c0f920a14bdffd10bc4d259 |
affected | ||
be4000bc4644d027c519b6361f5ae3bbfc52c347< ad38f2cdfef9a2f2899c30cad269baec5bfd4a5d |
affected | ||
be4000bc4644d027c519b6361f5ae3bbfc52c347< cc2f39d6ac48e6e3cb2d6240bc0d6df839dd0828 |
affected | ||
3.17 |
affected | ||
< 3.17 |
unaffected | ||
6.12.75≤ 6.12.* |
unaffected | ||
6.18.14≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-45949 基础信息
漏洞信息
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Vulnerability Title
hwrng: core - use RCU and work_struct to fix race condition
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
hwrng: core - use RCU and work_struct to fix race condition
Currently, hwrng_fill is not cleared until the hwrng_fillfn() thread
exits. Since hwrng_unregister() reads hwrng_fill outside the rng_mutex
lock, a concurrent hwrng_unregister() may call kthread_stop() again on
the same task.
Additionally, if hwrng_unregister() is called immediately after
hwrng_register(), the stopped thread may have never been executed. Thus,
hwrng_fill remains dirty even after hwrng_unregister() returns. In this
case, subsequent calls to hwrng_register() will fail to start new
threads, and hwrng_unregister() will call kthread_stop() on the same
freed task. In both cases, a use-after-free occurs:
refcount_t: addition on 0; use-after-free.
WARNING: ... at lib/refcount.c:25 refcount_warn_saturate+0xec/0x1c0
Call Trace:
kthread_stop+0x181/0x360
hwrng_unregister+0x288/0x380
virtrng_remove+0xe3/0x200
This patch fixes the race by protecting the global hwrng_fill pointer
inside the rng_mutex lock, so that hwrng_fillfn() thread is stopped only
once, and calls to kthread_run() and kthread_stop() are serialized
with the lock held.
To avoid deadlock in hwrng_fillfn() while being stopped with the lock
held, we convert current_rng to RCU, so that get_current_rng() can read
current_rng without holding the lock. To remove the lock from put_rng(),
we also delay the actual cleanup into a work_struct.
Since get_current_rng() no longer returns ERR_PTR values, the IS_ERR()
checks are removed from its callers.
With hwrng_fill protected by the rng_mutex lock, hwrng_fillfn() can no
longer clear hwrng_fill itself. Therefore, if hwrng_fillfn() returns
directly after current_rng is dropped, kthread_stop() would be called on
a freed task_struct later. To fix this, hwrng_fillfn() calls schedule()
now to keep the task alive until being stopped. The kthread_stop() call
is also moved from hwrng_unregister() to drop_current_rng(), ensuring
kthread_stop() is called on all possible paths where current_rng becomes
NULL, so that the thread would not wait forever.
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
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hwrng核心模块中hwrng_fill的清理与线程停止存在竞争条件，可能导致释放后重用。
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-2026-45949 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-45949 补丁与修复 (4)
同批安全公告 · Linux · 2026-05-27 · 共 275 条
| CVE-2026-45972 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46039 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45898 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-45988 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-46056 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46037 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71311 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45843 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46099 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46010 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46076 | 7.9 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45931 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45878 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46036 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-46065 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45910 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45959 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-45909 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 275 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-45949
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