{ "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": "2026-08-19T16:30:54.269Z" }, "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" } } } }