CVE-2026-31413— Linux kernel 安全漏洞
影响版本矩阵 7
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | dea9989a3f3961faede93752cd81eb5a9514d911< 342aa1ee995ef5bbf876096dc3a5e51218d76fa4 | affected |
4c122e8ae14950cf6b59d208fc5160f7c601e746< 58bd87d0e69204dbd739e4387a1edb0c4b1644e7 | affected | ||
e52567173ba86dbffb990595fbe60e2e83899372< d13281ae7ea8902b21d99d10a2c8caf0bdec0455 | affected | ||
bffacdb80b93b7b5e96b26fad64cc490a6c7d6c7< c845894ebd6fb43226b3118d6b017942550910c5 | affected | ||
6.12.75< 6.12.80 | affected | ||
6.18.16< 6.18.21 | affected | ||
6.19.6< 6.19.11 | affected |
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一、 漏洞 CVE-2026-31413 基础信息
漏洞信息
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Vulnerability Title
bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR maybe_fork_scalars() is called for both BPF_AND and BPF_OR when the source operand is a constant. When dst has signed range [-1, 0], it forks the verifier state: the pushed path gets dst = 0, the current path gets dst = -1. For BPF_AND this is correct: 0 & K == 0. For BPF_OR this is wrong: 0 | K == K, not 0. The pushed path therefore tracks dst as 0 when the runtime value is K, producing an exploitable verifier/runtime divergence that allows out-of-bounds map access. Fix this by passing env->insn_idx (instead of env->insn_idx + 1) to push_stack(), so the pushed path re-executes the ALU instruction with dst = 0 and naturally computes the correct result for any opcode.
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maybe_fork_scalars函数中BPF_OR指令的标量分叉逻辑错误，可能导致越界映射访问。
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-2026-31413 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-31413 补丁与修复 (4)
IV. Related Vulnerabilities
V. Comments for CVE-2026-31413
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