CVE-2026-6862— Efivar: efivar: denial of service due to stack overflow in device path node parsing
Quick assessment
Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Red Hat Enterprise Linux 10是美国红帽（Red Hat）公司的一套面向企业用户的Linux操作系统。 Red Hat Enterprise Linux 10存在安全漏洞，该漏洞源于设备路径节点解析器未验证每个节点的Length字段至少为4字节，本地用户可通过提供特制设备路径节点导致无限递归、堆栈耗尽和进程崩溃，造成拒绝服务。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 7 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 8 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 9 | any |
unknown |
| Red Hat | Red Hat Hardened Images | 39-13.1.hum1< * |
unaffected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
unknown |
any |
unknown |
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I. Basic Information for CVE-2026-6862
Vulnerability Information
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Vulnerability Title
Efivar: efivar: denial of service due to stack overflow in device path node parsing
Source: CVE Program / CVE List V5
Vulnerability Description
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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat Enterprise Linux 10 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat Enterprise Linux 10是美国红帽（Red Hat）公司的一套面向企业用户的Linux操作系统。 Red Hat Enterprise Linux 10存在安全漏洞，该漏洞源于设备路径节点解析器未验证每个节点的Length字段至少为4字节，本地用户可通过提供特制设备路径节点导致无限递归、堆栈耗尽和进程崩溃，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Hardened Images | 39-13.1.hum1 ~ * |
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
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-6862
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-6862 (2)
Same Patch Batch · Red Hat · 2026-04-22 · 8 CVEs total
| CVE-2026-6859 | 8.8 HIGH | Instructlab: instructlab: arbitrary code execution due to hardcoded `trust_remote_code=tru |
| CVE-2026-6855 | 7.1 HIGH | Instructlab: instructlab: path traversal allows arbitrary directory creation and file writ |
| CVE-2026-6861 | 6.1 MEDIUM | Emacs: emacs: memory corruption vulnerability when processing svg css |
| CVE-2026-6844 | 5.5 MEDIUM | Binutils: binutils: denial of service vulnerabilities in readelf via crafted elf files |
| CVE-2026-6843 | 5.5 MEDIUM | Nano: nano: format string vulnerability leads to denial of service |
| CVE-2026-6848 | 5.4 MEDIUM | Quay: red hat quay: authentication bypass allows privileged actions without valid credenti |
| CVE-2026-6845 | 5.0 MEDIUM | Binutils: binutils: denial of service via crafted elf file |
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V. Comments for CVE-2026-6862
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