CVE-2026-35361: mknod Device Nodes Created Mislabeled On Vulnerability

LOW
Advisory Identifier: GHSA-r9hw-mj3w-phcq
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CVSS 3.4
CWE-732 CWE-459 CWE-281
Published
Advisory Summary

CVE-2026-35361 is a LOW (CVSS 3.4) device nodes created mislabeled on vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting mknod libraries in the crates.io ecosystem. The issue involves device nodes created mislabeled on selinux, with broken cleanup (remove_dir on a node). Remediation is available by upgrading affected packages to version 0.6.0.

CVE-2026-35361 at a Glance

CVE Identifier CVE-2026-35361
GHSA Identifier GHSA-r9hw-mj3w-phcq
Severity LOW
CVSS v3.1 Base Score 3.4
CWE Classification CWE-732: Incorrect Permission Assignment for Critical Resource
Affected Product mknod
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 3.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-35361

To remediate this vulnerability, upgrade all affected mknod dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

uu_mknod fixed: 0.6.0 
Upgrade uu_mknod to 0.6.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for uu_mknod

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-35361, inspect your project dependencies for mknod:

inspect dependencies for uu_mknod

Analyze the terminal output to locate any version of mknod in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. In mknod, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

uutils calls `mknod` *before* setting the SELinux context (GNU uses `setfscreatecon` first, labeling atomically). If `set_selinux_security_context` fails, cleanup uses `std::fs::remove_dir`, which cannot remove device nodes or FIFOs, leaving the mislabeled node behind. **Impact:** on SELinux-enforcing systems the node is created with the wrong context; the command reports failure but leaves a mislabeled device node that may bypass mandatory access control, and orphaned nodes can persist across reboots. Recommendation: use `setfscreatecon` before `mknod`, abort on failure, and use `remove_file` for cleanup. **Remediation:** Acknowledged by Canonical. --- _Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.58. Credit: Zellic._

CVE-2026-35361 Affected mknod Versions

1 component(s)
Fixed Versions:
0.6.0
Product / Package Ecosystem Affected Versions Fixed Version
uu_mknod
 crates.io
< 0.6.0
0.6.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/uutils/coreutils/security/advisories/GHSA-r9hw-mj3w-phcq
NVD — CVE-2026-35361 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35361
mknod Source Repository REPOSITORY
https://github.com/uutils/coreutils/pull/10582
Security Fix Commit FIX COMMIT
https://github.com/uutils/coreutils/commit/42b2ad83cdcf6e959ecb378c5040c60d9c64becf
mknod Source Repository REPOSITORY
https://github.com/uutils/coreutils
mknod Release RELEASE
https://github.com/uutils/coreutils/releases/tag/0.6.0

Frequently Asked Questions

What is CVE-2026-35361?
CVE-2026-35361 is a security vulnerability in mknod involving Device nodes created mislabeled on SELinux, with broken cleanup (remove_dir on a node) under CWE-732: Incorrect Permission Assignment for Critical Resource.
Which mknod versions are affected?
Affected versions include releases prior to 0.6.0 across affected packages: uu_mknod.
What version fixes CVE-2026-35361?
Upgrading to 0.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is uu_mknod affected?
Yes, uu_mknod is affected in releases prior to 0.6.0. Upgrade your dependency to 0.6.0 or later.
What is the CVSS score of CVE-2026-35361?
CVE-2026-35361 has a CVSS v3.1 base score of 3.4 (LOW) with vector string CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-35361?
CVE-2026-35361 is classified under CWE-732: Incorrect Permission Assignment for Critical Resource (The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.).
How can I check crates.io dependencies for CVE-2026-35361?
Run the dependency tree command: 'inspect dependencies for uu_mknod'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r9hw-mj3w-phcq",
  "modified" : "2026-07-06T21:54:05Z",
  "published" : "2026-07-06T21:54:05Z",
  "aliases" : [ "CVE-2026-35361" ],
  "summary" : "mknod: Device nodes created mislabeled on SELinux, with broken cleanup (remove_dir on a node)",
  "details" : "uutils calls `mknod` *before* setting the SELinux context (GNU uses `setfscreatecon` first, labeling atomically). If `set_selinux_security_context` fails, cleanup uses `std::fs::remove_dir`, which cannot remove device nodes or FIFOs, leaving the mislabeled node behind.\n\n**Impact:** on SELinux-enforcing systems the node is created with the wrong context; the command reports failure but leaves a mislabeled device node that may bypass mandatory access control, and orphaned nodes can persist across reboots. Recommendation: use `setfscreatecon` before `mknod`, abort on failure, and use `remove_file` for cleanup.\n\n**Remediation:** Acknowledged by Canonical.\n\n---\n_Reported by Zellic in the *uutils coreutils Program Security Assessment* (prepared for Canonical, Jan 20 2026), audited commit `3a07ffc5a9bd4c283e75afa548ba1f1957bad242`. Finding 3.58. Credit: Zellic._",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "uu_mknod"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/security/advisories/GHSA-r9hw-mj3w-phcq"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-35361"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/pull/10582"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/commit/42b2ad83cdcf6e959ecb378c5040c60d9c64becf"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/uutils/coreutils"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/uutils/coreutils/releases/tag/0.6.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-281", "CWE-459", "CWE-732" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-06T21:54:05Z",
    "nvd_published_at" : null
  }
}