CVE-2026-68435
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix address space mismatch in kexec command line lookup When searching the loaded segments for the "kexec" command line marker, the kexec_load(2) path (file_mode == 0) passes the user-space segment buffer straight to strncmp() through a bogus (char __user *) cast. This dereferences a user pointer in kernel context, which is wrong and is flagged by sparse: arch/loongarch/kernel/machine_kexec.c:84:51: sparse: incorrect type in argument 2 (different address spaces) @@ expected char const * @@ got char [noderef] __user * Here copy the marker-sized prefix of each segment into a small on-stack buffer with copy_from_user() before comparing, and skip segments that fault. The subsequent copy_from_user() that stages the full command line into the safe area is left unchanged.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-12 00:17:43.650000
Last modified
2026-10-30 13:19:45.440000
View original CVE JSON
{
"id": "CVE-2026-68435",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-08-12T00:17:43.650",
"lastModified": "2026-10-30T13:19:45.440",
"vulnStatus": "Received",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Fix address space mismatch in kexec command line lookup\n\nWhen searching the loaded segments for the \"kexec\" command line marker,\nthe kexec_load(2) path (file_mode == 0) passes the user-space segment\nbuffer straight to strncmp() through a bogus (char __user *) cast. This\ndereferences a user pointer in kernel context, which is wrong and is\nflagged by sparse:\n\n arch/loongarch/kernel/machine_kexec.c:84:51: sparse: incorrect type in\n argument 2 (different address spaces) @@ expected char const * @@ got\n char [noderef] __user *\n\nHere copy the marker-sized prefix of each segment into a small on-stack\nbuffer with copy_from_user() before comparing, and skip segments that\nfault. The subsequent copy_from_user() that stages the full command line\ninto the safe area is left unchanged."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/loongarch/kernel/machine_kexec.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "742f2c0a64a7557495e831c3c112d92e308bd4ae",
"versionType": "git",
"status": "affected"
},
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "3b71f51fa3a247921408879eab2ddee82da8a980",
"versionType": "git",
"status": "affected"
},
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e",
"versionType": "git",
"status": "affected"
},
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "a94d6726ec8680a2b0c453fc782a543f68a1ea06",
"versionType": "git",
"status": "affected"
},
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7",
"versionType": "git",
"status": "affected"
},
{
"version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
"lessThan": "485ed44db5694d8d2e5027f63ad608e705286f30",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/loongarch/kernel/machine_kexec.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.1",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.114",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.42",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.6",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/3b71f51fa3a247921408879eab2ddee82da8a980",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/742f2c0a64a7557495e831c3c112d92e308bd4ae",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/eaa908d8d523b0ab75dab5ebd6662e70af5e5d7e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}