--- id: CVE-2026-4878 title: A flaw was found in libcap summary: >- 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 c… severity: medium cvss: 6.7 cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H' cwe: - CWE-367 vendor: libcap_project product: libcap affected: - libcap - openshift_container_platform = 4.0 - enterprise_linux = 8.0 - enterprise_linux = 9.0 - enterprise_linux = 10.0 patched: - openshift_container_platform 4.12 - openshift_container_platform 4.13 - openshift_container_platform 4.14 - openshift_container_platform 4.15 - openshift_container_platform 4.16 - openshift_container_platform 4.17 - openshift_container_platform 4.18 - openshift_container_platform 4.19 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_eus_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_aus_v_8_6 - enterprise_linux_baseos_eus_extension_v_8_6 - enterprise_linux_baseos_e4s_v_8_8 - enterprise_linux_baseos_tus_v_8_8 - enterprise_linux_baseos_e4s_v_9_2 - enterprise_linux_baseos_eus_v_9_4 - enterprise_linux_baseos_eus_v_9_6 - enterprise_linux_baseos_v_9 - cost_management 4 - ai_inference_server 3.2 - ai_inference_server 3.3 - discovery 2 - hardened_images - insights_proxy 1.5 - openshift_distributed_tracing 3.9.3 - update_infrastructure 5 published: '2026-04-09' updated: '2026-09-09' sourceUpdated: '2026-09-09T13:20:24.613' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4878' references: - url: 'https://access.redhat.com/errata/RHSA-2026:12423' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:12441' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:13285' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:14162' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:14937' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:19130' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:19346' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:19456' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:19458' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20595' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:21254' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:21275' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:22634' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:22957' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:23233' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:23245' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:24346' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:25044' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:25096' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:25181' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:26542' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:27998' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:28887' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:29197' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30078' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30087' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30088' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30089' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:34098' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:39981' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:58981' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:59831' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:7473' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-4878' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2447554' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2451615' label: secalert@redhat.com - url: 'http://www.openwall.com/lists/oss-security/2026/04/07/14' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2026/04/07/4' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2026/04/08/9' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2026/04/09/5' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'http://www.openwall.com/lists/oss-security/2026/04/09/6' label: af854a3a-2127-422b-91ae-364da2661108 - url: 'https://access.redhat.com/errata/RHSA-2026:12423' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:12441' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:13285' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:14162' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:14937' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19130' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19346' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19456' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:19458' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:20595' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:21254' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:21275' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:22634' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:22957' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:23233' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:23245' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:24346' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:25044' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:25096' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:25181' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:26542' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:27998' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:28887' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:29197' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30078' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30087' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30088' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:30089' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:34098' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:39981' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:58981' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:59831' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/errata/RHSA-2026:7473' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://access.redhat.com/security/cve/CVE-2026-4878' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2451615' label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c - url: 'https://www.cve.org/CVERecord?id=CVE-2026-4878' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4878' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-04-09T00:00:00+00:00' epss: 0.00201 epssPercentile: 0.1035 ingestedAt: '2026-06-26T16:43:13.626Z' --- ## Overview 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. ## Affected - `libcap` - `openshift_container_platform = 4.0` - `enterprise_linux = 8.0` - `enterprise_linux = 9.0` - `enterprise_linux = 10.0` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:59831** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:59831) - **RHSA-2026:26542** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-06-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:26542) - **RHSA-2026:28887** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-07-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:28887) - **RHSA-2026:23233** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.15 · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:23233) - **RHSA-2026:25044** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-06-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:25044) - **RHSA-2026:34098** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-07-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:34098) - **RHSA-2026:25181** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-06-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:25181) - **RHSA-2026:23245** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-06-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:23245) - **RHSA-2026:19456** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-05-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:19456) - **RHSA-2026:12423** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-04-30 · [advisory](https://access.redhat.com/errata/RHSA-2026:12423) - **RHSA-2026:19130** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19130) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4 · updated 2026-09-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json)