FKIE_CVE-2026-68435

Vulnerability from fkie_nvd - Published: 2026-08-12 00:17 - Updated: 2026-08-17 06:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/485ed44db5694d8d2e5027f63ad608e705286f30
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kernel/machine_kexec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a94d6726ec8680a2b0c453fc782a543f68a1ea06",
              "status": "affected",
              "version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
              "versionType": "git"
            },
            {
              "lessThan": "7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7",
              "status": "affected",
              "version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
              "versionType": "git"
            },
            {
              "lessThan": "485ed44db5694d8d2e5027f63ad608e705286f30",
              "status": "affected",
              "version": "4a03b2ac06a5bcae29371866d9d11f5bfd4c9188",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/loongarch/kernel/machine_kexec.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.1"
            },
            {
              "lessThan": "6.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-68435",
  "lastModified": "2026-08-17T06:17:52.593",
  "metrics": {},
  "published": "2026-08-12T00:17:43.650",
  "references": [
    {
      "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/7a54e0cbaad4a5a09e7cc7a4f05d181048e98ca7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a94d6726ec8680a2b0c453fc782a543f68a1ea06"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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