CVE-2025-22058— 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，该漏洞源于内存计数泄漏，可能导致间歇性丢包。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking影响版本矩阵 20
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< 13550273171f5108b1ac572d8f72f4256ab92854 |
affected |
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< d9c8266ce536e8314d84370e983afcaa36fb19cf |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< c3ad8c30b6b109283d2643e925f8e65f2e7ab34e |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< 9122fec396950cc866137af7154b1d0d989be52e |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< aeef6456692c6f11ae53d278df64f1316a2a405a |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< a116b271bf3cb72c8155b6b7f39083c1b80dcd00 |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< c4bac6c398118fba79e32b1cd01db22dbfe29fbf |
affected | ||
f970bd9e3a06f06df8d8ecf1f8ad2c8615cc17eb< 3836029448e76c1e6f77cc5fe0adc09b018b5fa8 |
affected | ||
| … +12 条更多 | |||
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一、 漏洞 CVE-2025-22058 基础信息
漏洞信息
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Vulnerability Title
udp: Fix memory accounting leak.
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
udp: Fix memory accounting leak.
Matt Dowling reported a weird UDP memory usage issue.
Under normal operation, the UDP memory usage reported in /proc/net/sockstat
remains close to zero. However, it occasionally spiked to 524,288 pages
and never dropped. Moreover, the value doubled when the application was
terminated. Finally, it caused intermittent packet drops.
We can reproduce the issue with the script below [0]:
1. /proc/net/sockstat reports 0 pages
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 0
2. Run the script till the report reaches 524,288
# python3 test.py & sleep 5
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 3 mem 524288 <-- (INT_MAX + 1) >> PAGE_SHIFT
3. Kill the socket and confirm the number never drops
# pkill python3 && sleep 5
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 524288
4. (necessary since v6.0) Trigger proto_memory_pcpu_drain()
# python3 test.py & sleep 1 && pkill python3
5. The number doubles
# cat /proc/net/sockstat | grep UDP:
UDP: inuse 1 mem 1048577
The application set INT_MAX to SO_RCVBUF, which triggered an integer
overflow in udp_rmem_release().
When a socket is close()d, udp_destruct_common() purges its receive
queue and sums up skb->truesize in the queue. This total is calculated
and stored in a local unsigned integer variable.
The total size is then passed to udp_rmem_release() to adjust memory
accounting. However, because the function takes a signed integer
argument, the total size can wrap around, causing an overflow.
Then, the released amount is calculated as follows:
1) Add size to sk->sk_forward_alloc.
2) Round down sk->sk_forward_alloc to the nearest lower multiple of
PAGE_SIZE and assign it to amount.
3) Subtract amount from sk->sk_forward_alloc.
4) Pass amount >> PAGE_SHIFT to __sk_mem_reduce_allocated().
When the issue occurred, the total in udp_destruct_common() was 2147484480
(INT_MAX + 833), which was cast to -2147482816 in udp_rmem_release().
At 1) sk->sk_forward_alloc is changed from 3264 to -2147479552, and
2) sets -2147479552 to amount. 3) reverts the wraparound, so we don't
see a warning in inet_sock_destruct(). However, udp_memory_allocated
ends up doubling at 4).
Since commit 3cd3399dd7a8 ("net: implement per-cpu reserves for
memory_allocated"), memory usage no longer doubles immediately after
a socket is close()d because __sk_mem_reduce_allocated() caches the
amount in udp_memory_per_cpu_fw_alloc. However, the next time a UDP
socket receives a packet, the subtraction takes effect, causing UDP
memory usage to double.
This issue makes further memory allocation fail once the socket's
sk->sk_rmem_alloc exceeds net.ipv4.udp_rmem_min, resulting in packet
drops.
To prevent this issue, let's use unsigned int for the calculation and
call sk_forward_alloc_add() only once for the small delta.
Note that first_packet_length() also potentially has the same problem.
[0]:
from socket import *
SO_RCVBUFFORCE = 33
INT_MAX = (2 ** 31) - 1
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', 0))
s.setsockopt(SOL_SOCKET, SO_RCVBUFFORCE, INT_MAX)
c = socket(AF_INET, SOCK_DGRAM)
c.connect(s.getsockname())
data = b'a' * 100
while True:
c.send(data)
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，该漏洞源于内存计数泄漏，可能导致间歇性丢包。
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-2025-22058 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-22058 补丁与修复 (2)
CVE-2025-22058 其他参考 (6)
同批安全公告 · Linux · 2025-04-16 · 共 127 条
| CVE-2025-22021 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-22110 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-22077 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-22088 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-22118 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22040 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22041 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22039 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-58096 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22086 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22074 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-23133 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22117 | 8.7 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22108 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22080 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22121 | 8.4 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22038 | 8.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22042 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22043 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-22045 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 127 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-22058
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