CVE-2025-39749— 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，该漏洞源于对rcu_data结构中的defer_qs_iw_pending字段缺乏保护，可能导致数据竞争。
可能的 ATT&CK 技术 1 AI
T1499 · Endpoint Denial of Service影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 0864f057b050bc6dd68106b3185e02db5140012d< 74f58f382a7c8333f8d09701aefaa25913bdbe0e |
affected |
0864f057b050bc6dd68106b3185e02db5140012d< f937759c7432d6151b73e1393b6517661813d506 |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< 0ad84d62217488e679ecc90e8628980dcc003de3 |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< b5de8d80b5d049f051b95d9b1ee50ae4ab656124 |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< b55947b725f190396f475d5d0c59aa855a4d8895 |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< e35e711c78c8a4c43330c0dcb1c4d507a19c20f4 |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< 90de9c94ea72327cfa9c2c9f6113c23a513af60b |
affected | ||
0864f057b050bc6dd68106b3185e02db5140012d< 55e11f6776798b27cf09a7aa0d718415d4fc9cf5 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2025-39749 基础信息
漏洞信息
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Vulnerability Title
rcu: Protect ->defer_qs_iw_pending from data race
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
rcu: Protect ->defer_qs_iw_pending from data race
On kernels built with CONFIG_IRQ_WORK=y, when rcu_read_unlock() is
invoked within an interrupts-disabled region of code [1], it will invoke
rcu_read_unlock_special(), which uses an irq-work handler to force the
system to notice when the RCU read-side critical section actually ends.
That end won't happen until interrupts are enabled at the soonest.
In some kernels, such as those booted with rcutree.use_softirq=y, the
irq-work handler is used unconditionally.
The per-CPU rcu_data structure's ->defer_qs_iw_pending field is
updated by the irq-work handler and is both read and updated by
rcu_read_unlock_special(). This resulted in the following KCSAN splat:
------------------------------------------------------------------------
BUG: KCSAN: data-race in rcu_preempt_deferred_qs_handler / rcu_read_unlock_special
read to 0xffff96b95f42d8d8 of 1 bytes by task 90 on cpu 8:
rcu_read_unlock_special+0x175/0x260
__rcu_read_unlock+0x92/0xa0
rt_spin_unlock+0x9b/0xc0
__local_bh_enable+0x10d/0x170
__local_bh_enable_ip+0xfb/0x150
rcu_do_batch+0x595/0xc40
rcu_cpu_kthread+0x4e9/0x830
smpboot_thread_fn+0x24d/0x3b0
kthread+0x3bd/0x410
ret_from_fork+0x35/0x40
ret_from_fork_asm+0x1a/0x30
write to 0xffff96b95f42d8d8 of 1 bytes by task 88 on cpu 8:
rcu_preempt_deferred_qs_handler+0x1e/0x30
irq_work_single+0xaf/0x160
run_irq_workd+0x91/0xc0
smpboot_thread_fn+0x24d/0x3b0
kthread+0x3bd/0x410
ret_from_fork+0x35/0x40
ret_from_fork_asm+0x1a/0x30
no locks held by irq_work/8/88.
irq event stamp: 200272
hardirqs last enabled at (200272): [<ffffffffb0f56121>] finish_task_switch+0x131/0x320
hardirqs last disabled at (200271): [<ffffffffb25c7859>] __schedule+0x129/0xd70
softirqs last enabled at (0): [<ffffffffb0ee093f>] copy_process+0x4df/0x1cc0
softirqs last disabled at (0): [<0000000000000000>] 0x0
------------------------------------------------------------------------
The problem is that irq-work handlers run with interrupts enabled, which
means that rcu_preempt_deferred_qs_handler() could be interrupted,
and that interrupt handler might contain an RCU read-side critical
section, which might invoke rcu_read_unlock_special(). In the strict
KCSAN mode of operation used by RCU, this constitutes a data race on
the ->defer_qs_iw_pending field.
This commit therefore disables interrupts across the portion of the
rcu_preempt_deferred_qs_handler() that updates the ->defer_qs_iw_pending
field. This suffices because this handler is not a fast path.
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，该漏洞源于对rcu_data结构中的defer_qs_iw_pending字段缺乏保护，可能导致数据竞争。
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-2025-39749 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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同批安全公告 · Linux · 2025-09-11 · 共 54 条
| CVE-2025-39758 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-39761 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39750 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39790 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39779 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39791 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39780 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39785 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39786 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39787 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39740 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39770 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39738 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39789 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39776 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-39764 | Linux kernel 安全漏洞 | |
| CVE-2025-39768 | Linux kernel 安全漏洞 | |
| CVE-2025-39773 | Linux kernel 安全漏洞 | |
| CVE-2025-39772 | Linux kernel 安全漏洞 | |
| CVE-2025-39769 | Linux kernel 安全漏洞 |
显示前 20 条，共 54 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-39749
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