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CVE-2026-68186— 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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于binfmt_misc在打开解释器之前就设置have_execfd标志，可能导致空指针解引用。

AI 预测 7.8 利用难度: 中等 EPSS 0.21% · P11

影响版本矩阵 18

厂商产品 版本范围状态
Linux Linux bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< a8e9e9450df44e9dd529ec5beff283f48f4f4b97 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< a261dc49d99681c9c71f38d16e31812dc3e30412 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< 40c09b7a1d4e0a4866042c87c2bd911bb57566c8 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< 0f19d54e2524f0bf183b82f365ae4e49b4a2f788 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< 2dd0298905e97795a9c5ec30cf5b41975f821632 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< 1cd4e9b7967dab48c9f79a00b06ffff7208c0993 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< 5ccc99d58f94fad258c9c375715b3974e48620e8 affected
bc2bf338d54b7aadaed49bb45b9e10d4592b2a46< bbf5f639918dc011aaf60aab8480218758ee68c5 affected
… +10 条更多
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一、 漏洞 CVE-2026-68186 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
binfmt_misc: set have_execfd only once the interpreter is opened
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: binfmt_misc: set have_execfd only once the interpreter is opened load_misc_binary() raises bprm->have_execfd as soon as it sees the 'O' (or 'C') flag. This happens well before it opens the interpreter. If that open fails the flag stays set on the bprm. binfmt_misc is at the head of the format list so an interpreter open failure that returns -ENOEXEC lets the search fall through to a later format. This means it runs the matched binary directly having never staged an interpreter. So bprm->executable is NULL while have_execfd falsely claims a descriptor is present. Consequently, begin_new_exec() dereferences the missing executable: would_dump(bprm, bprm->executable); and NULL derefs. Had it not, the hand-off later in the same function would have failed anyway. FD_ADD(0, bprm->executable) rejects a NULL file with -ENOMEM. Both sites are past the point of no return so the exec cannot be unwound either way. This can be reached by unprivileged users as binfmt_misc can be mounted in user namespaces. So a user can register an 'O' entry whose interpreter lives on a FUSE mount, have the FUSE server fail the open with -ENOEXEC and execute a native ELF file that matches the entry. have_execfd only means anything alongside the executable it describes which is not set until the interpreter has been opened and staged. So lets raise it there, next to execfd_creds, which is already set at that point. An open failure now leaves it clear, so the fallback format derives credentials from the binary and emits no AT_EXECFD, as it would for any native exec. The argv rewrite load_misc_binary() performs before the open is still not undone. This means the binary sees the interpreter path in argv[0] and its own path in argv[1] but that predates this change and only became observable once the exec stopped faulting.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于binfmt_misc在打开解释器之前就设置have_execfd标志，可能导致空指针解引用。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux bc2bf338d54b7aadaed49bb45b9e10d4592b2a46 ~ a8e9e9450df44e9dd529ec5beff283f48f4f4b97 -
Linux Linux 5.8 -

二、漏洞 CVE-2026-68186 的公开POC

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三、漏洞 CVE-2026-68186 的情报信息

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CVE-2026-68186 补丁与修复 (8)

同批安全公告 · Linux · 2026-08-10 · 共 344 条

CVE-2026-68159 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68381 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68385 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68388 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68117 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68170 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68161 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68123 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68160 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68127 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68144 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68137 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68302 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68300 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68426 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68136 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68154 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68158 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68156 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-68124 9.6 CRITICAL Linux kernel 安全漏洞

显示前 20 条，共 344 条。 查看全部 &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68186

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