CVE-2026-4878— Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()
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I. Basic Information for CVE-2026-4878
Vulnerability Information
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Vulnerability Title
Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the `cap_set_file()` function. This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: NVD (National Vulnerability Database)
Vulnerability Title
libcap 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcap是Michael Kerrisk个人开发者的一个网络数据包捕获函数包。 libcap存在安全漏洞，该漏洞源于cap_set_file函数存在竞争条件，可能导致权限提升。
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 Enterprise Linux 10 | 0:2.69-7.el10_1.1 ~ * | cpe:/o:redhat:enterprise_linux:10.1 | |
| Red Hat | Red Hat Enterprise Linux 8 | 0:2.48-6.el8_10.1 ~ * | cpe:/o:redhat:enterprise_linux:8::baseos | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.48-10.el9_7.1 ~ * | cpe:/a:redhat:enterprise_linux:9::appstream | |
| Red Hat | Red Hat Enterprise Linux 9 | 0:2.48-10.el9_7.1 ~ * | cpe:/a:redhat:enterprise_linux:9::appstream | |
| Red Hat | Red Hat Discovery 2 | 1778101579 ~ * | cpe:/a:redhat:discovery:2::el9 | |
| Red Hat | Red Hat Discovery 2 | 1778156756 ~ * | cpe:/a:redhat:discovery:2::el9 | |
| Red Hat | Red Hat Hardened Images | 2.78-1.1.hum1 ~ * | cpe:/a:redhat:hummingbird:1 | |
| Red Hat | Red Hat OpenShift distributed tracing 3.9.3 | 1778056267 ~ * | cpe:/a:redhat:openshift_distributed_tracing:3.9::el9 | |
| Red Hat | Red Hat OpenShift distributed tracing 3.9.3 | 1778056233 ~ * | cpe:/a:redhat:openshift_distributed_tracing:3.9::el9 | |
| Red Hat | Red Hat OpenShift distributed tracing 3.9.3 | 1778056245 ~ * | cpe:/a:redhat:openshift_distributed_tracing:3.9::el9 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 6 | - | cpe:/o:redhat:enterprise_linux:6 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat Enterprise Linux 7 | - | cpe:/o:redhat:enterprise_linux:7 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | - | cpe:/a:redhat:openshift:4 |
II. Public POCs for CVE-2026-4878
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Red Hat Enterprise Linux 10
- CVE-2026-42011
Gnutls: gnutls: security bypass due to incorrect name constr - CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de - CVE-2026-34000
Xwayland: xorg: x.org x server: information disclosure and d
Same vendor: Red Hat
- CVE-2026-42011
Gnutls: gnutls: security bypass due to incorrect name constr - CVE-2026-42010
Gnutls: gnutls: authentication bypass via nul character in u - CVE-2026-6420
Keylime: keylime: security bypass due to hardcoded tpm quote - CVE-2026-34956
Openvswitch: open vswitch: denial of service via malformed f - CVE-2026-34002
Xorg: xwayland: x.org x server: information disclosure or de
Same weakness: CWE-367
- CVE-2026-42344
FastGPT: DNS rebinding TOCTOU bypass in isInternalAddress al - CVE-2026-44694
n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API clien - CVE-2025-69233
Apache CloudStack: Domain/account resources limits not honor - CVE-2026-34354
Akamai Guardicore Platform Agent 安全漏洞 - CVE-2026-41002
VMware Spring Cloud Config 安全漏洞
V. Comments for CVE-2026-4878
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