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Fencer Vulns
high 7.1

CVE-2026-54369 json

acl < 2.4.0 Symlink Traversal Privilege Escalation via libacl Functions

published 2026-06-29 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-40085

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

acl before version 2.4.0 contains a symlink traversal vulnerability in the libacl pathname-based functions acl_get_file(), acl_set_file(), acl_extended_file(), and acl_delete_def_file() that allows local attackers to escalate privileges by replacing any pathname component with a symbolic link. Attackers who control any component of a pathname processed by a privileged caller can redirect ACL read or write operations to arbitrary files or directories, enabling unauthorized manipulation of access control lists and local privilege escalation.

Patch / fix

  • acl project acl 2.4.0
  • Red Hat Red Hat Enterprise Linux 10 0:2.4.0-1.el10_2
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.4.0-0.el10_0.1
  • Red Hat Red Hat Enterprise Linux 8 0:2.4.0-1.el8_10
  • Red Hat Red Hat Enterprise Linux 9 0:2.4.0-1.el9_8
  • Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202608130832-0
  • Red Hat Red Hat Discovery 2 1784821670, 1784821750
  • Red Hat Red Hat Hardened Images 2.4.0-0.1.hum1
  • Red Hat Red Hat Insights proxy 1.5 1786433656
  • Red Hat Red Hat OpenShift distributed tracing 3.10.2 1785704636
  • Red Hat Red Hat Update Infrastructure 5 1784794289, 1784794778, 1784794818, 1784795076, 1784795112, 1787135742, 1787241211, 1787241260
  • acl Debian 14 2.4.0-1

debian advisories DEBIAN-CVE-2026-54369

  • acl RHEL 8 2.4.0-1.el8_10
  • libacl RHEL 8 2.4.0-1.el8_10
  • acl RHEL 10.2 2.4.0-1.el10_2
  • libacl RHEL 10.2 2.4.0-1.el10_2
  • acl RHEL 9 2.4.0-1.el9_8
  • libacl RHEL 9 2.4.0-1.el9_8
  • acl hummingbird 1 2.4.0-0.1.hum1
  • libacl hummingbird 1 2.4.0-0.1.hum1

red hat advisories RHSA-2026:72819RHSA-2026:72820RHSA-2026:71656RHSA-2026:67140RHSA-2026:67142RHSA-2026:67144

  • attr SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 2.6.0-150000.4.3.1
  • acl SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 2.4.0-150000.4.6.1
  • attr SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.6.0-160000.1.1
  • acl SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.4.0-160000.1.1

suse advisories SUSE-SU-2026:4176-1SUSE-SU-2026:23670-1SUSE-SU-2026:23705-1SUSE-SU-2026:23726-1

  • attr openSUSE Leap 16.0 2.6.0-160000.1.1
  • acl openSUSE Leap 16.0 2.4.0-160000.1.1
  • acl openSUSE Tumbleweed 2.4.0-1.1

opensuse advisories openSUSE-SU-2026:21832-1openSUSE-SU-2026:11312-1

  • acl AlmaLinux 8 2.4.0-1.el8_10
  • libacl AlmaLinux 8 2.4.0-1.el8_10
  • acl AlmaLinux 9 2.4.0-1.el9_8
  • libacl AlmaLinux 9 2.4.0-1.el9_8
  • acl AlmaLinux 10 2.4.0-1.el10_2
  • libacl AlmaLinux 10 2.4.0-1.el10_2

almalinux advisories ALSA-2026:43420ALSA-2026:42736ALSA-2026:42739

  • acl Rocky Linux 8 2.4.0-1.el8_10
  • acl Rocky Linux 10 2.4.0-1.el10_2
  • acl Rocky Linux 9 2.4.0-1.el9_8

rocky linux advisories RLSA-2026:43420RLSA-2026:42739RLSA-2026:42736

  • acl Azure Linux 3.0 2.4.0-1

azure linux advisories AZL-91397

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-2026-54369 updated cvss 7.1

acl: Symlink traversal privilege escalation via libacl functions

  • Red Hat Enterprise Linux 6 acl, libacl Red Hat Enterprise Linux 7 acl, libacl Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-istio-csr-rhel9 1791378395, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82336
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-operator-rhel9 1790272426, cert-manager/cert-manager-operator-rhel9 1790589855, cert-manager/jetstack-cert-manager-rhel9 1790223279, cert-manager/jetstack-cert-manager-rhel9 1790589912, cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914, +2 more
    fixed: vendor fix RHSA-2026:72475
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-rhel9-operator 1790844333
    fixed: vendor fix RHSA-2026:81201
  • Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1790621718, rhaiis/vllm-rocm-rhel9 1790621713, rhaiis/model-opt-cuda-rhel9 1790621714
    fixed: vendor fix RHSA-2026:73859
  • Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357, rhaii/model-opt-cuda-rhel9 1791803821
    fixed: vendor fix RHSA-2026:82066
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1784821750, discovery/discovery-server-rhel9 1784821670
    fixed: vendor fix RHSA-2026:46836
show 30 more
  • Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
    fixed: vendor fix RHSA-2026:92452
  • Red Hat Enterprise Linux AppStream (v. 9) libacl-devel 2.4.0-1.el9_8, libacl-debuginfo 2.4.0-1.el9_8
    fixed: vendor fix RHSA-2026:42736
  • Red Hat Enterprise Linux AppStream (v. 10) libacl-devel 2.4.0-1.el10_2, libacl-debuginfo 2.4.0-1.el10_2
    fixed: vendor fix RHSA-2026:42739
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) acl-debuginfo 2.4.0-0.el9_2.1, acl-debugsource 2.4.0-0.el9_2.1
    fixed: vendor fix RHSA-2026:67142
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) acl-debuginfo 2.4.0-0.el9_4.1, acl-debugsource 2.4.0-0.el9_4.1
    fixed: vendor fix RHSA-2026:67144
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libacl-debuginfo 2.4.0-0.el10_0.1
    fixed: vendor fix RHSA-2026:64805
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) acl-debuginfo 2.4.0-0.el9_6.1, acl-debugsource 2.4.0-0.el9_6.1
    fixed: vendor fix RHSA-2026:67140
  • Red Hat Enterprise Linux BaseOS (v. 8) acl 2.4.0-1.el8_10, libacl 2.4.0-1.el8_10
    fixed: vendor fix RHSA-2026:43420
  • Red Hat Enterprise Linux BaseOS (v. 9) acl 2.4.0-1.el9_8, libacl 2.4.0-1.el9_8
    fixed: vendor fix RHSA-2026:42736
  • Red Hat Enterprise Linux BaseOS (v. 10) acl 2.4.0-1.el10_2, libacl 2.4.0-1.el10_2
    fixed: vendor fix RHSA-2026:42739
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) acl 2.4.0-0.el8_4.1, libacl 2.4.0-0.el8_4.1
    fixed: vendor fix RHSA-2026:72820
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) acl 2.4.0-0.el8_6.1, libacl 2.4.0-0.el8_6.1
    fixed: vendor fix RHSA-2026:72819
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) acl 2.4.0-0.el8_8.1, libacl 2.4.0-0.el8_8.1
    fixed: vendor fix RHSA-2026:71656
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) acl 2.4.0-0.el9_2.1
    fixed: vendor fix RHSA-2026:67142
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) acl 2.4.0-0.el9_4.1
    fixed: vendor fix RHSA-2026:67144
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) acl 2.4.0-0.el10_0.1, libacl 2.4.0-0.el10_0.1
    fixed: vendor fix RHSA-2026:64805
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) acl 2.4.0-0.el9_6.1
    fixed: vendor fix RHSA-2026:67140
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) acl 2.4.0-0.el8_4.1, libacl 2.4.0-0.el8_4.1
    fixed: vendor fix RHSA-2026:72820
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) acl 2.4.0-0.el8_6.1, libacl 2.4.0-0.el8_6.1
    fixed: vendor fix RHSA-2026:72819
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) acl 2.4.0-0.el8_8.1, libacl 2.4.0-0.el8_8.1
    fixed: vendor fix RHSA-2026:71656
  • Red Hat Hardened Images acl 2.4.0-0.1.hum1, libacl 2.4.0-0.1.hum1
    fixed: vendor fix RHSA-2026:34351
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1786433656
    fixed: vendor fix RHSA-2026:53371
  • Red Hat OpenShift AI 3.0 rhai/base-image-cpu-rhel9 1790277045, rhai/base-image-tpu-rhel9 1790276884, rhai/base-image-cuda-rhel9 1790276974, rhai/base-image-rocm-rhel9 1790276886, rhai/base-image-spyre-rhel9 1790276889
    fixed: vendor fix RHSA-2026:73960
  • Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1790703590, rhai/base-image-tpu-rhel9 1790703497, rhai/base-image-cuda-rhel9 1790703586, rhai/base-image-rocm-rhel9 1790703494, rhai/base-image-rocm-rhel9 1790703506, rhai/base-image-spyre-rhel9 1790703568
    fixed: vendor fix RHSA-2026:74460
  • Red Hat OpenShift AI 3.3 rhai/base-image-cpu-rhel9 1790703615, rhai/base-image-tpu-rhel9 1790703516, rhai/base-image-spyre-rhel9 1790703579, rhai/base-image-neuron-rhel9 1790703516, rhai/base-image-rocm-6.4-rhel9 1790703524, rhai/base-image-rocm-7.0-rhel9 1790703516, +4 more
    fixed: vendor fix RHSA-2026:74359
  • Red Hat OpenShift AI 3.4 rhai/base-image-cpu-rhel9 1790703631, rhai/base-image-tpu-rhel9 1790703539, rhai/base-image-gaudi-rhel9 1790703553, rhai/base-image-spyre-rhel9 1790703597, rhai/base-image-neuron-rhel9 1790703542, rhai/base-image-rocm-6.4-rhel9 1790703545, +3 more
    fixed: vendor fix RHSA-2026:74679
  • Red Hat OpenShift AI 3.5 rhai/base-image-cpu-rhel9 1790703656, rhai/base-image-tpu-rhel9 1790703554, rhai/base-image-gaudi-rhel9 1790703552, rhai/base-image-rubin-rhel9 1790703707, rhai/base-image-spyre-rhel9 1790703630, rhai/base-image-neuron-rhel9 1790703557, +3 more
    fixed: vendor fix RHSA-2026:75652
  • Red Hat OpenShift Container Platform 4.12 rhcos 412.86.202610250235
    fixed: vendor fix RHSA-2026:90272
  • Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202609302032
    fixed: vendor fix RHSA-2026:77320
  • Red Hat OpenShift Container Platform 4.14 rhcos 414.92.202609282130
    fixed: vendor fix RHSA-2026:73866

10 more fixed, 18 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
4 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.4 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CISA ADP 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CNA 4.0 8.4 CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/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

Affected products

  • acl project acl
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4.22
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Insights proxy 1.5
  • Red Hat Red Hat OpenShift distributed tracing 3.10.2
  • Red Hat Red Hat Update Infrastructure 5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

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.