CVE-2025-68169— 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refill_skbs中内存分配时持有自旋锁，可能导致死锁。
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T1499 · Endpoint Denial of Service
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一、 漏洞 CVE-2025-68169 基础信息
漏洞信息
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Vulnerability Title
netpoll: Fix deadlock in memory allocation under spinlock
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netpoll: Fix deadlock in memory allocation under spinlock
Fix a AA deadlock in refill_skbs() where memory allocation while holding
skb_pool->lock can trigger a recursive lock acquisition attempt.
The deadlock scenario occurs when the system is under severe memory
pressure:
1. refill_skbs() acquires skb_pool->lock (spinlock)
2. alloc_skb() is called while holding the lock
3. Memory allocator fails and calls slab_out_of_memory()
4. This triggers printk() for the OOM warning
5. The console output path calls netpoll_send_udp()
6. netpoll_send_udp() attempts to acquire the same skb_pool->lock
7. Deadlock: the lock is already held by the same CPU
Call stack:
refill_skbs()
spin_lock_irqsave(&skb_pool->lock) <- lock acquired
__alloc_skb()
kmem_cache_alloc_node_noprof()
slab_out_of_memory()
printk()
console_flush_all()
netpoll_send_udp()
skb_dequeue()
spin_lock_irqsave(&skb_pool->lock) <- deadlock attempt
This bug was exposed by commit 248f6571fd4c51 ("netpoll: Optimize skb
refilling on critical path") which removed refill_skbs() from the
critical path (where nested printk was being deferred), letting nested
printk being called from inside refill_skbs()
Refactor refill_skbs() to never allocate memory while holding
the spinlock.
Another possible solution to fix this problem is protecting the
refill_skbs() from nested printks, basically calling
printk_deferred_{enter,exit}() in refill_skbs(), then, any nested
pr_warn() would be deferred.
I prefer this approach, given I _think_ it might be a good idea to move
the alloc_skb() from GFP_ATOMIC to GFP_KERNEL in the future, so, having
the alloc_skb() outside of the lock will be necessary step.
There is a possible TOCTOU issue when checking for the pool length, and
queueing the new allocated skb, but, this is not an issue, given that
an extra SKB in the pool is harmless and it will be eventually used.
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refill_skbs中内存分配时持有自旋锁，可能导致死锁。
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-2025-68169 的公开POC
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CVE-2025-68169 其他参考 (2)
同批安全公告 · Linux · 2025-12-16 · 共 156 条
| CVE-2025-68263 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68284 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68315 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68192 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68301 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68285 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40350 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-68256 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68304 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68255 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68314 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68226 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40362 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68250 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68207 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68208 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68179 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68183 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68181 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-68265 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 156 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-68169
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