CVE-2026-4878 (GCVE-0-2026-4878)

Vulnerability from cvelistv5 – Published: 2026-04-09 14:49 – Updated: 2026-06-30 03:16
VLAI
Title
Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()
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 capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:12423 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:12441 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13285 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14162 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:14937 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19130 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19346 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19456 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19458 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20595 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21254 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21275 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22634 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22957 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23233 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23245 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:24346 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25044 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25096 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25181 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26542 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27998 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:29197 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30078 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30087 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30088 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30089 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7473 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-4878 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447554
https://bugzilla.redhat.com/show_bug.cgi?id=2451615 issue-trackingx_refsource_REDHAT
http://www.openwall.com/lists/oss-security/2026/04/07/4
http://www.openwall.com/lists/oss-security/2026/0…
http://www.openwall.com/lists/oss-security/2026/04/08/9
http://www.openwall.com/lists/oss-security/2026/04/09/5
http://www.openwall.com/lists/oss-security/2026/04/09/6
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:2.69-7.el10_1.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.1
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:2.69-7.el10_2.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:2.69-7.el10_0.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:2.48-6.el8_10.1 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:2.48-4.el8_6.1 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:2.48-4.el8_6.1 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.6::baseos
    cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:2.48-5.el8_8.1 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:2.48-5.el8_8.1 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8::baseos
    cpe:/o:redhat:rhel_tus:8.8::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.48-10.el9_7.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:2.48-10.el9_8.1 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
    cpe:/o:redhat:enterprise_linux:9::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:2.48-9.el9_2.1 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::appstream
    cpe:/o:redhat:rhel_e4s:9.2::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:2.48-9.el9_4.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.4::appstream
    cpe:/o:redhat:rhel_eus:9.4::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:2.48-9.el9_6.1 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6::appstream
    cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat OpenShift Container Platform 4.13 Unaffected: 413.92.202606160406-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.13::el9
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Red Hat Red Hat OpenShift Container Platform 4.15 Unaffected: 415.92.202606030318-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.15::el9
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Red Hat Red Hat OpenShift Container Platform 4.16 Unaffected: 416.94.202606051757-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.18 Unaffected: 418.94.202606051320-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19 Unaffected: 4.19.9.6.202606031700-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.19::el9
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Red Hat Cost Management 4 Unaffected: 1780946239 , < * (rpm)
    cpe:/a:redhat:cost_management:4::el9
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Red Hat Red Hat AI Inference Server 3.2 Unaffected: 1780681984 , < * (rpm)
    cpe:/a:redhat:ai_inference_server:3.2::el9
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Red Hat Red Hat AI Inference Server 3.3 Unaffected: 1782352950 , < * (rpm)
    cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat AI Inference Server 3.3 Unaffected: 1782352919 , < * (rpm)
    cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat AI Inference Server 3.3 Unaffected: 1782353093 , < * (rpm)
    cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat AI Inference Server 3.3 Unaffected: 1782352847 , < * (rpm)
    cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1778101579 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1778156756 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1782159791 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1782166952 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Hardened Images Unaffected: 2.78-1.1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Insights proxy 1.5 Unaffected: 1780420428 , < * (rpm)
    cpe:/a:redhat:insights_proxy:1.5::el9
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Red Hat Red Hat OpenShift distributed tracing 3.9.3 Unaffected: 1778056267 , < * (rpm)
    cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
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Red Hat Red Hat OpenShift distributed tracing 3.9.3 Unaffected: 1778056233 , < * (rpm)
    cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
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Red Hat Red Hat OpenShift distributed tracing 3.9.3 Unaffected: 1778056245 , < * (rpm)
    cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1779798159 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1779798164 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1779798165 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Update Infrastructure 5 Unaffected: 1779798222 , < * (rpm)
    cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat OpenShift Container Platform 4.13     cpe:/a:redhat:openshift:4.13::el9
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Red Hat Red Hat OpenShift Container Platform 4.15     cpe:/a:redhat:openshift:4.15::el9
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Red Hat Red Hat OpenShift Container Platform 4.16     cpe:/a:redhat:openshift:4.16::el9
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Red Hat Red Hat OpenShift Container Platform 4.18     cpe:/a:redhat:openshift:4.18::el9
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Red Hat Red Hat OpenShift Container Platform 4.19     cpe:/a:redhat:openshift:4.19::el9
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS (v. 8)     cpe:/o:redhat:enterprise_linux:8::baseos
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Red Hat Red Hat Enterprise Linux BaseOS AUS (v.8.6)     cpe:/o:redhat:rhel_aus:8.6::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)     cpe:/o:redhat:rhel_eus_long_life:8.6::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS E4S (v.8.8)     cpe:/o:redhat:rhel_e4s:8.8::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS TUS (v.8.8)     cpe:/o:redhat:rhel_tus:8.8::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.2)     cpe:/o:redhat:rhel_e4s:9.2::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.4)     cpe:/o:redhat:rhel_eus:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
Create a notification for this product.
Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Cost Management 4     cpe:/a:redhat:cost_management:4::el9
Create a notification for this product.
Red Hat Red Hat AI Inference Server 3.2     cpe:/a:redhat:ai_inference_server:3.2::el9
Create a notification for this product.
Red Hat Red Hat AI Inference Server 3.3     cpe:/a:redhat:ai_inference_server:3.3::el9
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Red Hat Red Hat Discovery 2     cpe:/a:redhat:discovery:2::el9
Create a notification for this product.
Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
Create a notification for this product.
Red Hat Red Hat Insights proxy 1.5     cpe:/a:redhat:insights_proxy:1.5::el9
Create a notification for this product.
Red Hat Red Hat OpenShift distributed tracing 3.9.3     cpe:/a:redhat:openshift_distributed_tracing:3.9::el9
Create a notification for this product.
Red Hat Red Hat Update Infrastructure 5     cpe:/a:redhat:rhui:5::el9
Create a notification for this product.
Date Public
2026-04-06 00:00
Credits
Red Hat would like to thank Ali Raza for reporting this issue.
Show details on NVD website

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            "cpes": [
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
            "vendor": "Red Hat"
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            "cpes": [
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              "cpe:/o:redhat:enterprise_linux:10.2"
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            "product": "Red Hat Enterprise Linux AppStream (v. 10)",
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            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.4::appstream"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.4)",
            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.6::appstream"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
            "vendor": "Red Hat"
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          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:9::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1",
              "cpe:/o:redhat:enterprise_linux:10.2"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 10)",
            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/o:redhat:enterprise_linux:8::baseos"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 8)",
            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/o:redhat:rhel_aus:8.6::baseos"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS AUS (v.8.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus_long_life:8.6::baseos"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)",
            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/o:redhat:rhel_e4s:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_tus:8.8::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS TUS (v.8.8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_e4s:9.2::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS E4S (v.9.2)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:rhel_eus:9.4::baseos"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS EUS (v.9.4)",
            "vendor": "Red Hat"
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            "cpes": [
              "cpe:/o:redhat:rhel_eus:9.6::baseos"
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            "defaultStatus": "affected",
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            "vendor": "Red Hat"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux BaseOS (v. 9)",
            "vendor": "Red Hat"
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          {
            "cpes": [
              "cpe:/a:redhat:cost_management:4::el9"
            ],
            "defaultStatus": "affected",
            "product": "Cost Management 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ai_inference_server:3.2::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat AI Inference Server 3.2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ai_inference_server:3.3::el9"
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          "value": "Made public."
        }
      ],
      "title": "Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()",
      "workarounds": [
        {
          "lang": "en",
          "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition"
    }
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  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-4878",
    "datePublished": "2026-04-09T14:49:02.942Z",
    "dateReserved": "2026-03-26T06:32:41.308Z",
    "dateUpdated": "2026-06-30T03:16:56.930Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-4878",
      "date": "2026-06-29",
      "epss": "0.00188",
      "percentile": "0.08587"
    },
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\"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-06-27T08:12:47.059Z\"}, \"x_redhatCweChain\": \"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-4878\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T03:16:56.930Z\", \"dateReserved\": \"2026-03-26T06:32:41.308Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-04-09T14:49:02.942Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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