CVE-2025-40123— 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attach类型验证不足，可能导致空指针取消引用。
可能的 ATT&CK 技术 1 AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 5e43f899b03a3492ce5fc44e8900becb04dae9c0< e53a59e7cee5c1605d1ed595933098c2b69108f9 |
affected |
5e43f899b03a3492ce5fc44e8900becb04dae9c0< dc4f348952173beb8ceb15be30b249276eccb605 |
affected | ||
5e43f899b03a3492ce5fc44e8900becb04dae9c0< a99de19128aec0913f3d529f529fbbff5edfaff8 |
affected | ||
5e43f899b03a3492ce5fc44e8900becb04dae9c0< 08cb3dc9d2b44f153d0bcf2cb966e4a94b5d0f32 |
affected | ||
5e43f899b03a3492ce5fc44e8900becb04dae9c0< f856c598080ba7ce1252867b8ecd6ad5bdaf9a6a |
affected | ||
5e43f899b03a3492ce5fc44e8900becb04dae9c0< c1ad19b5d8e23123503dcaf2d4342e1b90b923ad |
affected | ||
5e43f899b03a3492ce5fc44e8900becb04dae9c0< 4540aed51b12bc13364149bf95f6ecef013197c0 |
affected | ||
4.17 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2025-40123 基础信息
漏洞信息
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Vulnerability Title
bpf: Enforce expected_attach_type for tailcall compatibility
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Enforce expected_attach_type for tailcall compatibility
Yinhao et al. recently reported:
Our fuzzer tool discovered an uninitialized pointer issue in the
bpf_prog_test_run_xdp() function within the Linux kernel's BPF subsystem.
This leads to a NULL pointer dereference when a BPF program attempts to
deference the txq member of struct xdp_buff object.
The test initializes two programs of BPF_PROG_TYPE_XDP: progA acts as the
entry point for bpf_prog_test_run_xdp() and its expected_attach_type can
neither be of be BPF_XDP_DEVMAP nor BPF_XDP_CPUMAP. progA calls into a slot
of a tailcall map it owns. progB's expected_attach_type must be BPF_XDP_DEVMAP
to pass xdp_is_valid_access() validation. The program returns struct xdp_md's
egress_ifindex, and the latter is only allowed to be accessed under mentioned
expected_attach_type. progB is then inserted into the tailcall which progA
calls.
The underlying issue goes beyond XDP though. Another example are programs
of type BPF_PROG_TYPE_CGROUP_SOCK_ADDR. sock_addr_is_valid_access() as well
as sock_addr_func_proto() have different logic depending on the programs'
expected_attach_type. Similarly, a program attached to BPF_CGROUP_INET4_GETPEERNAME
should not be allowed doing a tailcall into a program which calls bpf_bind()
out of BPF which is only enabled for BPF_CGROUP_INET4_CONNECT.
In short, specifying expected_attach_type allows to open up additional
functionality or restrictions beyond what the basic bpf_prog_type enables.
The use of tailcalls must not violate these constraints. Fix it by enforcing
expected_attach_type in __bpf_prog_map_compatible().
Note that we only enforce this for tailcall maps, but not for BPF devmaps or
cpumaps: There, the programs are invoked through dev_map_bpf_prog_run*() and
cpu_map_bpf_prog_run*() which set up a new environment / context and therefore
these situations are not prone to this issue.
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attach类型验证不足，可能导致空指针取消引用。
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-2025-40123 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-40123 补丁与修复 (2)
同批安全公告 · Linux · 2025-11-12 · 共 96 条
| CVE-2025-40176 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-40140 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40135 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40158 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40186 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40204 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40133 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40168 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40141 | 8.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40149 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40190 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40139 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40151 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40159 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40165 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40174 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40172 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40170 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40169 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-40167 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 96 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-40123
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