LoongArch: Fix address space mismatch in kexec command line lookup
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.
CVE-2026-68435
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-68435
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"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"
}
],
"programFiles": [
"arch/loongarch/kernel/machine_kexec.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.1"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.1",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/loongarch/kernel/machine_kexec.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-68435
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46478 · Revision 1
- Added to Heist Feed
- Publisher date