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vuln-cve/data/2026/68xxx/CVE-2026-68186.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-68186",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-07-30T09:28:09.373Z",
"datePublished": "2026-08-10T11:59:58.299Z",
"dateUpdated": "2026-11-06T16:45:00.927Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-19T16:30:54.269Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: set have_execfd only once the interpreter is opened\n\nload_misc_binary() raises bprm->have_execfd as soon as it sees the 'O'\n(or 'C') flag. This happens well before it opens the interpreter. If\nthat open fails the flag stays set on the bprm. binfmt_misc is at the\nhead of the format list so an interpreter open failure that returns\n-ENOEXEC lets the search fall through to a later format. This means it\nruns the matched binary directly having never staged an interpreter. So\nbprm->executable is NULL while have_execfd falsely claims a descriptor\nis present.\n\nConsequently, begin_new_exec() dereferences the missing executable:\n\n would_dump(bprm, bprm->executable);\n\nand NULL derefs. Had it not, the hand-off later in the same function\nwould have failed anyway. FD_ADD(0, bprm->executable) rejects a NULL\nfile with -ENOMEM. Both sites are past the point of no return so the\nexec cannot be unwound either way.\n\nThis can be reached by unprivileged users as binfmt_misc can be mounted\nin user namespaces. So a user can register an 'O' entry whose\ninterpreter lives on a FUSE mount, have the FUSE server fail the open\nwith -ENOEXEC and execute a native ELF file that matches the entry.\n\nhave_execfd only means anything alongside the executable it describes\nwhich is not set until the interpreter has been opened and staged.\nSo lets raise it there, next to execfd_creds, which is already set at\nthat point. An open failure now leaves it clear, so the fallback format\nderives credentials from the binary and emits no AT_EXECFD, as it would\nfor any native exec. The argv rewrite load_misc_binary() performs before\nthe open is still not undone. This means the binary sees the interpreter\npath in argv[0] and its own path in argv[1] but that predates this\nchange and only became observable once the exec stopped faulting."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/binfmt_misc.c"
],
"versions": [
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "a8e9e9450df44e9dd529ec5beff283f48f4f4b97",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "a261dc49d99681c9c71f38d16e31812dc3e30412",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "40c09b7a1d4e0a4866042c87c2bd911bb57566c8",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "0f19d54e2524f0bf183b82f365ae4e49b4a2f788",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "2dd0298905e97795a9c5ec30cf5b41975f821632",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "1cd4e9b7967dab48c9f79a00b06ffff7208c0993",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "5ccc99d58f94fad258c9c375715b3974e48620e8",
"status": "affected",
"versionType": "git"
},
{
"version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46",
"lessThan": "bbf5f639918dc011aaf60aab8480218758ee68c5",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/binfmt_misc.c"
],
"versions": [
{
"version": "5.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.265",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.216",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.183",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.148",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.101",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.42",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1.6",
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "5.10.265"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "5.15.216"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "6.1.183"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "6.6.148"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "6.12.101"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "6.18.42"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "7.1.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.8",
"versionEndExcluding": "7.2"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/a8e9e9450df44e9dd529ec5beff283f48f4f4b97"
},
{
"url": "https://git.kernel.org/stable/c/a261dc49d99681c9c71f38d16e31812dc3e30412"
},
{
"url": "https://git.kernel.org/stable/c/40c09b7a1d4e0a4866042c87c2bd911bb57566c8"
},
{
"url": "https://git.kernel.org/stable/c/0f19d54e2524f0bf183b82f365ae4e49b4a2f788"
},
{
"url": "https://git.kernel.org/stable/c/2dd0298905e97795a9c5ec30cf5b41975f821632"
},
{
"url": "https://git.kernel.org/stable/c/1cd4e9b7967dab48c9f79a00b06ffff7208c0993"
},
{
"url": "https://git.kernel.org/stable/c/5ccc99d58f94fad258c9c375715b3974e48620e8"
},
{
"url": "https://git.kernel.org/stable/c/bbf5f639918dc011aaf60aab8480218758ee68c5"
}
],
"title": "binfmt_misc: set have_execfd only once the interpreter is opened",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-68186",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-11-06T16:43:58.814480Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-06T16:45:00.927Z"
}
}
]
}
}
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