CVE-2025-38591— 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bpf模块在访问指针ctx字段时拒绝较窄的访问。
影响版本矩阵 16
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f96da09473b52c09125cc9bf7d7d4576ae8229e0< 7847c4140e06f6e87229faae22cc38525334c156 |
affected |
f96da09473b52c09125cc9bf7d7d4576ae8229e0< feae34c992eb7191862fb1594c704fbbf650fef8 |
affected | ||
f96da09473b52c09125cc9bf7d7d4576ae8229e0< 33660d44e789edb4f303210c813fc56d56377a90 |
affected | ||
f96da09473b52c09125cc9bf7d7d4576ae8229e0< e2e9599f3503df7cf3569d2b6c50d5488fb59435 |
affected | ||
f96da09473b52c09125cc9bf7d7d4576ae8229e0< 058a0da4f6d916a79b693384111bb80a90d73763 |
affected | ||
f96da09473b52c09125cc9bf7d7d4576ae8229e0< 202900ceeef67458c964c2af6e1427c8e533ea7c |
affected | ||
f96da09473b52c09125cc9bf7d7d4576ae8229e0< e09299225d5ba3916c91ef70565f7d2187e4cca0 |
affected | ||
4.13 |
affected | ||
| … +8 条更多 | |||
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一、 漏洞 CVE-2025-38591 基础信息
漏洞信息
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Vulnerability Title
bpf: Reject narrower access to pointer ctx fields
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Reject narrower access to pointer ctx fields
The following BPF program, simplified from a syzkaller repro, causes a
kernel warning:
r0 = *(u8 *)(r1 + 169);
exit;
With pointer field sk being at offset 168 in __sk_buff. This access is
detected as a narrower read in bpf_skb_is_valid_access because it
doesn't match offsetof(struct __sk_buff, sk). It is therefore allowed
and later proceeds to bpf_convert_ctx_access. Note that for the
"is_narrower_load" case in the convert_ctx_accesses(), the insn->off
is aligned, so the cnt may not be 0 because it matches the
offsetof(struct __sk_buff, sk) in the bpf_convert_ctx_access. However,
the target_size stays 0 and the verifier errors with a kernel warning:
verifier bug: error during ctx access conversion(1)
This patch fixes that to return a proper "invalid bpf_context access
off=X size=Y" error on the load instruction.
The same issue affects multiple other fields in context structures that
allow narrow access. Some other non-affected fields (for sk_msg,
sk_lookup, and sockopt) were also changed to use bpf_ctx_range_ptr for
consistency.
Note this syzkaller crash was reported in the "Closes" link below, which
used to be about a different bug, fixed in
commit fce7bd8e385a ("bpf/verifier: Handle BPF_LOAD_ACQ instructions
in insn_def_regno()"). Because syzbot somehow confused the two bugs,
the new crash and repro didn't get reported to the mailing list.
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bpf模块在访问指针ctx字段时拒绝较窄的访问。
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-2025-38591 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-38591 补丁与修复 (1)
同批安全公告 · Linux · 2025-08-19 · 共 59 条
| CVE-2025-38561 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38566 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38560 | 9.3 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-38601 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38600 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38599 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38592 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38608 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38574 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38571 | 8.2 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38615 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38579 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38604 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38607 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38614 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38593 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38586 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38582 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38580 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-38555 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 59 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-38591
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