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Fencer Vulns
high 7.5

CVE-2025-52881 json

runc: LSM labels can be bypassed with malicious config using dummy procfs files

published 2025-11-05 12 mo ago modified 2026-10-07 32 d ago also EUVD-2025-37940 , GHSA-cgrx-mc8f-2prm , GO-2025-4098

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions 1.2.7, 1.3.2 and 1.4.0-rc.2, an attacker can trick runc into misdirecting writes to /proc to other procfs files through the use of a racing container with shared mounts (we have also verified this attack is possible to exploit using a standard Dockerfile with docker buildx build as that also permits triggering parallel execution of containers with custom shared mounts configured). This redirect could be through symbolic links in a tmpfs or theoretically other methods such as regular bind-mounts. While similar, the mitigation applied for the related CVE, CVE-2019-19921, was fairly limited and effectively only caused runc to verify that when LSM labels are written they are actually procfs files. This issue is fixed in versions 1.2.8, 1.3.3, and 1.4.0-rc.3.

Patch / fix

  • go github.com/opencontainers/runc 1.2.8, 1.3.3, 1.4.0-rc.3
  • go github.com/opencontainers/selinux 1.13.0
  • linuxfoundation runc 1.2.8, 1.3.3, 1.4.0-rc.3
  • linuxfoundation selinux 1.13.0
  • runc Debian 14 1.3.3+ds1-2

debian advisories DEBIAN-CVE-2025-52881

  • runc-app Ubuntu 22.04 LTS 1.3.3-0ubuntu1~22.04.2
  • runc-app Ubuntu 24.04 LTS 1.3.3-0ubuntu1~24.04.2
  • runc-app Ubuntu 25.10 1.3.3-0ubuntu1~25.10.2
  • runc-stable Ubuntu 25.10 1.3.3-0ubuntu1~25.10.2

ubuntu advisories UBUNTU-CVE-2025-52881

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • perf openshift 4.15 5.14.0-284.155.1.el9_2
  • rtla openshift 4.15 5.14.0-284.155.1.el9_2
  • runc openshift 4.16, openshift 4.15, openshift 4.14 +1 more 4:1.2.9-1.rhaos4.16.el8
  • runc openshift 4.16, openshift 4.15, openshift 4.14 +1 more 4:1.2.9-1.rhaos4.16.el9
  • kernel openshift 4.15 5.14.0-284.155.1.el9_2
  • bpftool openshift 4.15 7.0.0-284.155.1.el9_2
  • kernel-rt openshift 4.15 5.14.0-284.155.1.rt14.440.el9_2
  • kernel-64k openshift 4.15 5.14.0-284.155.1.el9_2

red hat advisories RHSA-2026:1540RHSA-2026:10703RHSA-2026:8325RHSA-2026:4533RHSA-2025:22030RHSA-2026:4693

  • podman Linux Micro 6.1 5.4.2-slfo.1.1_6.1
  • podman Linux Micro 6.0 4.9.5-12.1
  • buildah SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 1.35.5-150500.3.62.1
  • buildah SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.35.5-150400.3.68.1
  • podman Linux Micro 6.1 5.4.2-slfo.1.1_5.1
  • podman SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 5.4.2-160000.4.1
  • alloy SLES for SAP applications 16.0, SLES 16.0 1.12.2-160000.1.1
  • alloy SLE Module for Basesystem 15 SP7 1.12.2-150700.15.15.1

suse advisories SUSE-SU-2026:24378-1SUSE-SU-2026:22516-1SUSE-SU-2026:2733-1SUSE-SU-2026:2706-1SUSE-SU-2026:22451-1SUSE-SU-2026:20626-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • podman openSUSE Leap 16.0 5.4.2-160000.5.1
  • podman openSUSE Leap 16.0 5.4.2-160000.4.1
  • alloy openSUSE Leap 16.0 1.12.2-160000.1.1
  • buildah openSUSE Leap 16.0 1.39.5-160000.1.1
  • podman openSUSE Leap 16.0 5.4.2-160000.3.1
  • buildah openSUSE Tumbleweed 1.42.2-1.1
  • podman openSUSE Tumbleweed 5.7.1-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21244-1openSUSE-SU-2026:20305-1openSUSE-SU-2026:20140-1openSUSE-SU-2026:20080-1openSUSE-SU-2026:20072-1

  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3901+4b80ecd7
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+4068+0e21408f
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3845+87b84552
  • crit AlmaLinux 8 3.18-5.module_el8.10.0+3858+6ad51f9f
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+4089+ce72bbbe
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3926+f12484f5
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3876+e55593a8
  • criu AlmaLinux 8 3.18-5.module_el8.10.0+3909+6e1c1eb7

almalinux advisories ALSA-2025:23543ALSA-2025:22011ALSA-2025:22012ALSA-2025:21702ALSA-2025:21220ALSA-2025:21232

  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1880+8e896d1b
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+2001+6a33db9f
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1874+ce489889
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1843+6892ab28
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1896+b18fa106
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1825+623b0c20
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1948+4b5cd4a9
  • criu Rocky Linux 8 3.18-5.module+el8.10.0+1815+5fe7415e

rocky linux advisories RLSA-2025:23543RLSA-2025:22012RLSA-2025:22011RLSA-2025:21232RLSA-2025:21220RLSA-2025:20957

  • runc Alpine 3.24, Alpine 3.23, Alpine 3.22 1.3.3-r0
  • podman Alpine 3.22 5.6.2-r1
  • podman Alpine 3.24, Alpine 3.23 5.7.0-r0
  • buildah Alpine 3.22 1.41.6-r0
  • buildah Alpine 3.24, Alpine 3.23 1.42.1-r0

alpine advisories ALPINE-CVE-2025-52881

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • moby-runc CBL-Mariner 2.0 1.2.8-1
  • runc Azure Linux 3.0 1.3.3-1
  • kubernetes Azure Linux 3.0 1.30.10-18

azure linux advisories AZL-69824AZL-69826AZL-70586

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-52881 updated cvss 8.2

runc: opencontainers/selinux: container escape and denial of service due to arbitrary write gadgets and procfs write redirects

  • Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2 rhai/assisted-installer-controller-rhel9
    affected: workaround, no fix available
  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/cluster-logging-rhel9-operator
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Multicluster Engine for Kubernetes multicluster-engine/assisted-service-8-rhel8, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/assisted-installer-controller-rhel9 Red Hat OpenShift API for Data Protection oadp/oadp-velero-plugin-rhel8
    affected: workaround, no fix available
  • Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-service-api-rhel9, openshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-1/serverless-must-gather-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat AI Inference Server rhai/base-image-cuda-rhel9, rhai/base-image-rocm-rhel9
    affected: workaround, no fix available
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-26/eda-controller-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Build of Kueue kueue/kueue-must-gather-rhel9
    affected: workaround, no fix planned “Will not fix”
show 29 more
  • Red Hat Certification Program for Red Hat Enterprise Linux 9 rhcertification/redhat-certification-baremetal
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AI (RHEL AI) rhelai1/bootc-gcp-nvidia-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +3 more
    affected: workaround, no fix available
  • Red Hat OpenShift Virtualization 4 cnvnetworking-plugins-rhel9, container-native-virtualization/wasp-agent-rhel9, container-native-virtualization/multus-dynamic-networks-rhel9, container-native-virtualization/cnv-containernetworking-plugins-rhel9, container-native-virtualization/passt-network-binding-plugin-cni-rhel9, container-native-virtualization/passt-network-binding-plugin-sidecar-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Quay 3 quay/quay-builder-rhel8
    affected: workaround, no fix available
  • Red Hat Builds for Red Hat OpenShift 1.6.0 openshift-builds 1.6.2-1767088114, openshift-builds 1.6.2-1767088118
    fixed: vendor fix RHSA-2026:0050
  • Red Hat multicluster engine for Kubernetes 2.9 multicluster-engine/hypershift-rhel9-operator 1790168054
    fixed: vendor fix RHSA-2026:72851
  • Red Hat Network Observability (NETOBSERV) 1.11.0 network-observability 1771226060
    fixed: vendor fix RHSA-2026:2900
  • Red Hat OpenShift API for Data Protection 1.4 oadp 1770643554
    fixed: vendor fix RHSA-2026:2951
  • Red Hat OpenShift API for Data Protection 1.5 oadp 1768602558, oadp 1768627772
    fixed: vendor fix RHSA-2026:2343
  • Red Hat OpenShift Compliance Operator 1 compliance 1775641344
    fixed: vendor fix RHSA-2026:8433
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1787860580, rhaiis/vllm-rocm-rhel9 1787884873, rhaiis/model-opt-cuda-rhel9 1787772157
    fixed: vendor fix RHSA-2026:61628
  • Red Hat Enterprise Linux AppStream (v. 8) crit 3.18-5.module+el8.10.0+23647+cfd78660, crit 3.18-5.module+el8.10.0+23820+ae6deecc, criu 3.18-5.module+el8.10.0+23647+cfd78660, criu 3.18-5.module+el8.10.0+23820+ae6deecc, runc 1.2.5-2.module+el8.10.0+23647+cfd78660, runc 1.2.9-2.module+el8.10.0+23820+ae6deecc, +60 more
    fixed: vendor fix RHSA-2025:21232
  • Red Hat Enterprise Linux AppStream (v. 9) runc 1.2.5-3.el9_6, runc 1.3.0-4.el9_7, podman 5.6.0-7.el9_7, buildah 1.41.6-1.el9_7, podman-tests 5.6.0-7.el9_7, podman-docker 5.6.0-7.el9_7, +3 more
    fixed: vendor fix RHSA-2025:19927
  • Red Hat Enterprise Linux AppStream (v. 10) podman 5.6.0-6.el10_1, buildah 1.41.6-1.el10_1, podman-docker 5.6.0-6.el10_1, podman-remote 5.6.0-6.el10_1, buildah-tests 1.41.6-1.el10_1
    fixed: vendor fix RHSA-2025:22012
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) crit 3.15-3.module+el8.6.0+24209+25a14987, criu 3.15-3.module+el8.6.0+24209+25a14987, crun 1.14.3-1.module+el8.6.0+24209+25a14987, udica 0.2.6-5.module+el8.6.0+24209+25a14987, conmon 2.1.4-1.module+el8.6.0+24209+25a14987, runc 1.2.9-1.module+el8.6.0+24209+25a14987.1, +27 more Red Hat Enterprise Linux AppStream E4S (v.8.6) crit 3.15-3.module+el8.6.0+24209+25a14987, criu 3.15-3.module+el8.6.0+24209+25a14987, crun 1.14.3-1.module+el8.6.0+24209+25a14987, udica 0.2.6-5.module+el8.6.0+24209+25a14987, conmon 2.1.4-1.module+el8.6.0+24209+25a14987, runc 1.2.9-1.module+el8.6.0+24209+25a14987.1, +27 more
    fixed: vendor fix RHSA-2026:10703
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) crit 3.15-4.module+el8.8.0+23884+2031fc78, criu 3.15-4.module+el8.8.0+23884+2031fc78, runc 1.2.9-1.module+el8.8.0+23884+2031fc78, crun 1.14.3-1.module+el8.8.0+23884+2031fc78, conmon 2.1.6-1.module+el8.8.0+23884+2031fc78, udica 0.2.6-20.module+el8.8.0+23884+2031fc78, +27 more
    fixed: vendor fix RHSA-2026:4693
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) runc 1.2.9-1.el9_0, podman 4.2.0-6.el9_0.6, buildah 1.26.9-1.el9_0.3, podman-tests 4.2.0-6.el9_0.6, podman-docker 4.2.0-6.el9_0.6, podman-remote 4.2.0-6.el9_0.6, +4 more
    fixed: vendor fix RHSA-2026:8325
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) runc 1.2.9-1.el9_2.1, podman 4.4.1-22.el9_2.5, buildah 1.29.5-1.el9_2.2, podman-tests 4.4.1-22.el9_2.5, buildah-tests 1.29.5-1.el9_2.2, podman-docker 4.4.1-22.el9_2.5, +3 more
    fixed: vendor fix RHSA-2026:4532
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) podman 5.4.0-14.el10_0, buildah 1.39.5-1.el10_0, buildah-tests 1.39.5-1.el10_0, podman-docker 5.4.0-14.el10_0, podman-remote 5.4.0-14.el10_0
    fixed: vendor fix RHSA-2025:21633
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) runc 1.2.9-1.el9_4, podman 4.9.4-19.el9_4.5, buildah 1.33.13-2.el9_4.1, podman-tests 4.9.4-19.el9_4.5, podman-docker 4.9.4-19.el9_4.5, podman-remote 4.9.4-19.el9_4.5, +2 more
    fixed: vendor fix RHSA-2026:0426
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) podman 5.4.0-15.el9_6, buildah 1.39.5-1.el9_6, podman-tests 5.4.0-15.el9_6, buildah-tests 1.39.5-1.el9_6, podman-docker 5.4.0-15.el9_6, podman-remote 5.4.0-15.el9_6, +1 more
    fixed: vendor fix RHSA-2025:21634
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) crit 3.15-3.module+el8.6.0+24209+25a14987, criu 3.15-3.module+el8.6.0+24209+25a14987, crun 1.14.3-1.module+el8.6.0+24209+25a14987, udica 0.2.6-5.module+el8.6.0+24209+25a14987, conmon 2.1.4-1.module+el8.6.0+24209+25a14987, runc 1.2.9-1.module+el8.6.0+24209+25a14987.1, +27 more
    fixed: vendor fix RHSA-2026:10703
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) crit 3.15-4.module+el8.8.0+23884+2031fc78, criu 3.15-4.module+el8.8.0+23884+2031fc78, runc 1.2.9-1.module+el8.8.0+23884+2031fc78, crun 1.14.3-1.module+el8.8.0+23884+2031fc78, conmon 2.1.6-1.module+el8.8.0+23884+2031fc78, udica 0.2.6-20.module+el8.8.0+23884+2031fc78, +27 more
    fixed: vendor fix RHSA-2026:4693
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) podman-tests 5.6.0-6.el10_1
    fixed: vendor fix RHSA-2025:21220
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) podman-tests 5.4.0-14.el10_0
    fixed: vendor fix RHSA-2025:23347
  • Red Hat Migration Toolkit 1.8 rhmtc/openshift-migration-controller-rhel8 1783953372
    fixed: vendor fix RHSA-2026:41928
  • Red Hat OpenShift AI 2.25 rhoai 1770053703, rhoai 1770053721, rhoai 1770053723, rhoai 1770053728, rhoai 1770053730, rhoai 1770053733, +19 more
    fixed: vendor fix RHSA-2026:2106
  • Red Hat OpenShift AI 3.3 rhoai 1769162595, rhoai 1770788873, rhoai 1771415661, rhoai 1771420581, rhoai 1771502843, rhoai 1771502844, +14 more
    fixed: vendor fix RHSA-2026:3713

21 more fixed, 54 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
12 mo ago

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/opencontainers/runc/security/advisories/GHSA-cgrx-mc8f-2prm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CNA 4.0 7.3 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD 3.1 7.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/opencontainers/runc
<1.2.8
>=1.3.0-rc.1, <1.3.3
>=1.4.0-rc.1, <1.4.0-rc.3
1.2.8
1.3.3
1.4.0-rc.3
go github.com/opencontainers/selinux
<1.13.0
1.13.0

Affected products

  • opencontainers runc

Classification

Weakness
  • CWE-61 UNIX Symbolic Link (Symlink) Following
  • CWE-363 Race Condition Enabling Link Following

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.