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No exploitation reportedFix available

CVE-2026-54370

No exploitation reported by the sources we read.

  • Published2026-06-29
  • WeaknessCWE-367

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.

Timeline

dates in UTC
  1. 2026-06-2914:16CVE publishedNVD

Versions per branch

Products declared by the CNA1 product

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • aclUbuntu:26.04:LTSall versions · no fixed version listed
  • aclUbuntu:25.10all versions · no fixed version listed
  • aclUbuntu:24.04:LTSall versions · no fixed version listed
  • aclUbuntu:22.04:LTSall versions · no fixed version listed
  • aclUbuntu:20.04:LTSall versions · no fixed version listed
  • aclUbuntu:18.04:LTSall versions · no fixed version listed
  • aclUbuntu:16.04:LTSall versions · no fixed version listed
  • aclUbuntu:14.04:LTSall versions · no fixed version listed

76 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-54370 Red Hat Product Security150 products fixed · 9 known affected

    acl: TOCTOU Symlink Traversal via getfacl/setfacl

    acl.src as a component of Red Hat Enterprise Linux 6 · libacl as a component of Red Hat Enterprise Linux 6 · libacl-devel as a component of Red Hat Enterprise Linux 6 · +6 more

  • RHSA-2026:82888 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2

  • RHSA-2026:82857 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82372 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82354 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82347 Red Hat Product Security8 products fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

19 more advisories

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:82888 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If t…
  2. Vendor fix Red Hat Product Security RHSA-2026:58981 · 3 productsPlease consult the RHUI Technology Preview Release Notes at https://access.redhat.com/articles/7141172 for instructions on how to use this image set.
  3. Vendor fix Red Hat Product Security RHSA-2026:53371 · 2 productsThe Insights proxy container image provided here is downloaded by the Red Hat Insights proxy product RPM. Before applying this update, make sure all previously released errata relevant to your system have been applied.
  4. Vendor fix Red Hat Product Security RHSA-2026:50205 · 4 productsFor details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/openshift_container_platform/latest/html/operators/administrator-tasks#olm-upgrading-operators
  5. Vendor fix Red Hat Product Security RHSA-2026:46836 · 2 productsThe containers required to run Discovery can be installed through discovery-installer RPM. See the official documentation for more details.
  6. Vendor fix Red Hat Product Security RHSA-2026:44481 · 5 productsThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-26
  • CISA-ADPSSVC decisionnone2026-06-29
  • CNACVSS 4.07.2known since 2026-10-26
  • CNACVSS 3.16.3known since 2026-10-26
  • CNAweakness (CWE)CWE-367known since 2026-10-26
  • FIRST EPSSEPSS score0.09 %2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS 4.0 vector
CVSS:4.0/AV:L/AC:H/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
Published
2026-06-29
Last Modified
2026-10-25
NVD status
Deferred
GitHub Advisory
GHSA-r45p-762r-6pqj

Frequently asked questions

What is CVE-2026-54370?

acl before version 2.4.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability that allows local attackers to escalate privileges by replacing a pathname component with a symbolic link between an lstat() check and subsequent symlink-following operations such as stat(), chown(), chmod(), acl_get_file(), and acl_set_file(). Attackers who control a pathname component can redirect file access control list operations to arbitrary files when getfacl, setfacl, or chacl is invoked by a privileged process over an attacker-controlled path, resulting in local privilege escalation.

Is CVE-2026-54370 actively exploited?

Active exploitation of CVE-2026-54370 has not been confirmed. Its EPSS score was 0.09% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-54370?

CVE-2026-54370 has a CVSS v3 base score of 6.3 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

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