CVE-2025-38463— 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skb剩余空间计算中的符号错误，可能导致缓冲区溢出。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 270a1c3de47e49dd2fc18f48e46b101e48050e78< 81373cd1d72d87c7d844d4454a526b8f53e72d00 |
affected |
270a1c3de47e49dd2fc18f48e46b101e48050e78< 62e6160cfb5514787bda833d466509edc38fde23 |
affected | ||
270a1c3de47e49dd2fc18f48e46b101e48050e78< 9f164fa6bb09fbcc60fa5c3ff551ce9eec1befd7 |
affected | ||
270a1c3de47e49dd2fc18f48e46b101e48050e78< d3a5f2871adc0c61c61869f37f3e697d97f03d8c |
affected | ||
6.5 |
affected | ||
< 6.5 |
unaffected | ||
6.6.99≤ 6.6.* |
unaffected | ||
6.12.39≤ 6.12.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2025-38463 基础信息
漏洞信息
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Vulnerability Title
tcp: Correct signedness in skb remaining space calculation
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tcp: Correct signedness in skb remaining space calculation
Syzkaller reported a bug [1] where sk->sk_forward_alloc can overflow.
When we send data, if an skb exists at the tail of the write queue, the
kernel will attempt to append the new data to that skb. However, the code
that checks for available space in the skb is flawed:
'''
copy = size_goal - skb->len
'''
The types of the variables involved are:
'''
copy: ssize_t (s64 on 64-bit systems)
size_goal: int
skb->len: unsigned int
'''
Due to C's type promotion rules, the signed size_goal is converted to an
unsigned int to match skb->len before the subtraction. The result is an
unsigned int.
When this unsigned int result is then assigned to the s64 copy variable,
it is zero-extended, preserving its non-negative value. Consequently, copy
is always >= 0.
Assume we are sending 2GB of data and size_goal has been adjusted to a
value smaller than skb->len. The subtraction will result in copy holding a
very large positive integer. In the subsequent logic, this large value is
used to update sk->sk_forward_alloc, which can easily cause it to overflow.
The syzkaller reproducer uses TCP_REPAIR to reliably create this
condition. However, this can also occur in real-world scenarios. The
tcp_bound_to_half_wnd() function can also reduce size_goal to a small
value. This would cause the subsequent tcp_wmem_schedule() to set
sk->sk_forward_alloc to a value close to INT_MAX. Further memory
allocation requests would then cause sk_forward_alloc to wrap around and
become negative.
[1]: https://syzkaller.appspot.com/bug?extid=de6565462ab540f50e47
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skb剩余空间计算中的符号错误，可能导致缓冲区溢出。
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-2025-38463 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 · 2025-07-25 · 共 114 条
| CVE-2025-38429 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38411 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38430 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38439 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38365 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38377 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38367 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38437 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38375 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38395 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38386 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38449 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38434 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38412 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38382 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38447 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38398 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38408 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38396 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38435 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 114 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-38463
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