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6.7 Medium

CVE-2026-4878 Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()

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.

CVSS 3.1 detail

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

Exploitable with local access to the machine, with an ordinary account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Local
Attack complexity
High
Privileges required
Low
Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat Hardened Images 2.78 earliest → < 2.78-1.1.hum1 2.78-1.1.hum1
Red Hat OpenShift distributed tracing 3.9.3 1778056245 earliest → < 1778056245 1778056245
Red Hat Discovery 2 1782166952 earliest → < 1782166952 1782166952
Show the 47 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
Red Hat Enterprise Linux 9.4 Extended Update Support Versions not published
Red Hat Update Infrastructure 5 1787241260 earliest → < 1787241260 1787241260
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Insights proxy 1.5 1780420428 earliest → < 1780420428 1780420428
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Versions not published
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Versions not published
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Versions not published
Red Hat OpenShift Container Platform 4.19 4.19 earliest → < 4.19.9.6.202606031700-0 4.19.9.6.202606031700-0
Red Hat AI Inference Server 3.2 1780681984 earliest → < 1780681984 1780681984
Red Hat OpenShift Container Platform 4.15 415.92 earliest → < 415.92.202606030318-0 415.92.202606030318-0
Red Hat OpenShift Container Platform 4.18 418.94 earliest → < 418.94.202606051320-0 418.94.202606051320-0
Red Hat OpenShift Container Platform 4.16 416.94 earliest → < 416.94.202606051757-0 416.94.202606051757-0
Cost Management 4 1783539156 earliest → < 1783539156 1783539156
Red Hat OpenShift Container Platform 4.13 413.92 earliest → < 413.92.202606160406-0 413.92.202606160406-0
Red Hat AI Inference Server 3.3 1782352847 earliest → < 1782352847 1782352847
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.2) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.4) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.6) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Red Hat Enterprise Linux BaseOS EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux BaseOS (v. 10) Versions not published
Red Hat Enterprise Linux BaseOS (v. 8) Versions not published
Red Hat Enterprise Linux BaseOS AUS (v.8.6) Versions not published
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) Versions not published
Red Hat Enterprise Linux BaseOS E4S (v.8.8) Versions not published
Red Hat Enterprise Linux BaseOS TUS (v.8.8) Versions not published
Red Hat Enterprise Linux BaseOS E4S (v.9.2) Versions not published
Red Hat Enterprise Linux BaseOS EUS (v.9.4) Versions not published
Red Hat Enterprise Linux BaseOS EUS (v.9.6) Versions not published
Red Hat Enterprise Linux BaseOS (v. 9) Versions not published
Red Hat OpenShift Container Platform 4.14 414.92 earliest → < 414.92.202606231112-0 414.92.202606231112-0
Red Hat OpenShift Container Platform 4.17 417.94 earliest → < 417.94.202606250942-0 417.94.202606250942-0
Cost Management Metrics Operator 4 1783539156 earliest → < 1783539156 1783539156
Cost Management Metrics Operator 4 1780946239 earliest → < 1780946239 1780946239
Red Hat OpenShift distributed tracing 3.9.1 1778056245 earliest → < 1778056245 1778056245
Red Hat OpenShift distributed tracing 3.9.2 1778056245 earliest → < 1778056245 1778056245
Red Hat OpenShift distributed tracing 3.9.0 1778056245 earliest → < 1778056245 1778056245
Red Hat OpenShift Container Platform 4.12 412.86 earliest → < 412.86.202608241157-0 412.86.202608241157-0
Cert Manager support for Red Hat OpenShift release 1.20 1790598593 earliest → < 1790598593 1790598593
Red Hat OpenShift AI 3.4 1790703542 earliest → < 1790703542 1790703542
Cert Manager support for Red Hat OpenShift release 1.17 1791970484 earliest → < 1791970484 1791970484
Cert Manager support for Red Hat OpenShift release 1.18 1791966259 earliest → < 1791966259 1791966259

References

Timeline

  1. Published
  2. Last modified

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