Vulnerability-Lookup

OESA-2026-4450 (CVE-2026-6862)

Vulnerability from osv_openeuler – Published: 2026-10-22 14:35 – Updated: 2026-10-22 14:35 – Source website

Summary

efivar security update

Details

Some command line interface of the UEFI variables tools are offered by .

Security Fix(es):

A flaw was found in libefiboot, a component of the efivar project. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)

Severity

5.5 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-6862	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "efivar-38-9.oe2403sp3.aarch64.rpm",
          "efivar-debuginfo-38-9.oe2403sp3.aarch64.rpm",
          "efivar-debugsource-38-9.oe2403sp3.aarch64.rpm",
          "efivar-devel-38-9.oe2403sp3.aarch64.rpm",
          "efivar-libs-38-9.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "efivar-help-38-9.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "efivar-38-9.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "efivar-38-9.oe2403sp3.x86_64.rpm",
          "efivar-debuginfo-38-9.oe2403sp3.x86_64.rpm",
          "efivar-debugsource-38-9.oe2403sp3.x86_64.rpm",
          "efivar-devel-38-9.oe2403sp3.x86_64.rpm",
          "efivar-libs-38-9.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "efivar",
        "purl": "pkg:rpm/openEuler/efivar\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "38-9.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Some command line interface of the UEFI variables tools are offered by .\r\n\r\nSecurity Fix(es):\n\nA flaw was found in libefiboot, a component of the efivar project. The device path node parser in libefiboot fails to validate that each node\u0026apos;s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).(CVE-2026-6862)",
  "id": "OESA-2026-4450",
  "modified": "2026-10-22T14:35:16Z",
  "published": "2026-10-22T14:35:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4450"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6862"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "efivar security update",
  "upstream": [
    "CVE-2026-6862"
  ]
}

CVE-2026-6862 (GCVE-0-2026-6862)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:45 – Updated: 2026-09-21 17:27

Title

Efivar: efivar: denial of service due to stack overflow in device path node parsing

Summary

A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 14:28 UTC

CWE

CWE-674 - Uncontrolled Recursion

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1046 records in the last 180 days details

References

3 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:69321	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-6862	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2459982	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 39-13.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-04-09 00:00

Credits

Red Hat would like to thank Mathis Huron (Oteria Cyber School, FuzzingLabs) for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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