CVE-2025-21922— 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，该漏洞源于未初始化PPP BPF程序头。
可能的 ATT&CK 技术 1 AI
T1059 · Command and Scripting Interpreter影响版本矩阵 18
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d685096c8129c9a92689975193e268945fd21dbf |
affected |
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2f591cb158807bdcf424f66f1fbfa6e4e50f3757 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4e2191b0fd0c064d37b0db67396216f2d4787e0f |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3de809a768464528762757e433cd50de35bcb3c1 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1eacd47636a9de5bee25d9d5962dc538a82d9f0b |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 8aa8a40c766b3945b40565a70349d5581458ff63 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< c036f5f2680cbdabdbbace86baee3c83721634d6 |
affected | ||
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4c2d14c40a68678d885eab4008a0129646805bae |
affected | ||
| … +10 条更多 | |||
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一、 漏洞 CVE-2025-21922 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
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Vulnerability Title
ppp: Fix KMSAN uninit-value warning with bpf
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
ppp: Fix KMSAN uninit-value warning with bpf
Syzbot caught an "KMSAN: uninit-value" warning [1], which is caused by the
ppp driver not initializing a 2-byte header when using socket filter.
The following code can generate a PPP filter BPF program:
'''
struct bpf_program fp;
pcap_t *handle;
handle = pcap_open_dead(DLT_PPP_PPPD, 65535);
pcap_compile(handle, &fp, "ip and outbound", 0, 0);
bpf_dump(&fp, 1);
'''
Its output is:
'''
(000) ldh [2]
(001) jeq #0x21 jt 2 jf 5
(002) ldb [0]
(003) jeq #0x1 jt 4 jf 5
(004) ret #65535
(005) ret #0
'''
Wen can find similar code at the following link:
https://github.com/ppp-project/ppp/blob/master/pppd/options.c#L1680
The maintainer of this code repository is also the original maintainer
of the ppp driver.
As you can see the BPF program skips 2 bytes of data and then reads the
'Protocol' field to determine if it's an IP packet. Then it read the first
byte of the first 2 bytes to determine the direction.
The issue is that only the first byte indicating direction is initialized
in current ppp driver code while the second byte is not initialized.
For normal BPF programs generated by libpcap, uninitialized data won't be
used, so it's not a problem. However, for carefully crafted BPF programs,
such as those generated by syzkaller [2], which start reading from offset
0, the uninitialized data will be used and caught by KMSAN.
[1] https://syzkaller.appspot.com/bug?extid=853242d9c9917165d791
[2] https://syzkaller.appspot.com/text?tag=ReproC&x=11994913980000
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，该漏洞源于未初始化PPP BPF程序头。
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-2025-21922 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
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同批安全公告 · Linux · 2025-04-01 · 共 93 条
| CVE-2025-21927 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21954 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21969 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21955 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21972 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21946 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21967 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21947 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21934 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21923 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21949 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21919 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21914 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21924 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21958 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21965 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21926 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21985 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 93 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21922
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