{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-68186", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-68186", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-10T11:59:58.299Z", "updatedAt": "2026-08-19T16:30:54.269Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "binfmt_misc: set have_execfd only once the interpreter is opened", "summary": "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": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "a8e9e9450df44e9dd529ec5beff283f48f4f4b97" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "a261dc49d99681c9c71f38d16e31812dc3e30412" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "40c09b7a1d4e0a4866042c87c2bd911bb57566c8" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "0f19d54e2524f0bf183b82f365ae4e49b4a2f788" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "2dd0298905e97795a9c5ec30cf5b41975f821632" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "1cd4e9b7967dab48c9f79a00b06ffff7208c0993" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "5ccc99d58f94fad258c9c375715b3974e48620e8" }, { "version": "bc2bf338d54b7aadaed49bb45b9e10d4592b2a46", "status": "affected", "versionType": "git", "lessThan": "bbf5f639918dc011aaf60aab8480218758ee68c5" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.8" }, { "version": "5.10.265", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.216", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.183", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.148", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.101", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.42", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }