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NVD / CVE Program· CNA VulnCheck

CVE-2026-54370: acl < 2.4.0 TOCTOU Symlink Traversal via getfacl/setfacl/chacl

HighCVSS 7.2 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.08% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: acl project acl 2.4.0.

Low priority for now. Upgrade to acl project acl 2.4.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Jun 29, 2026
Updated
Oct 25, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
7.2
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

  • acl project acl

    • before 2.4.0affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10aclbefore 2.4.0-1.el10_22.4.0-1.el10_2
AlmaLinux:10libaclbefore 2.4.0-1.el10_22.4.0-1.el10_2
AlmaLinux:10libacl-develbefore 2.4.0-1.el10_22.4.0-1.el10_2
AlmaLinux:8aclbefore 2.4.0-1.el8_102.4.0-1.el8_10
AlmaLinux:8libaclbefore 2.4.0-1.el8_102.4.0-1.el8_10
AlmaLinux:8libacl-develbefore 2.4.0-1.el8_102.4.0-1.el8_10
AlmaLinux:9aclbefore 2.4.0-1.el9_82.4.0-1.el9_8
AlmaLinux:9libaclbefore 2.4.0-1.el9_82.4.0-1.el9_8
AlmaLinux:9libacl-develbefore 2.4.0-1.el9_82.4.0-1.el9_8
Debian:12aclfrom 0—
Debian:14aclbefore 2.4.0-12.4.0-1
openSUSE:Leap 16.0aclbefore 2.4.0-160000.1.12.4.0-160000.1.1
openSUSE:Leap 16.0attrbefore 2.6.0-160000.1.12.6.0-160000.1.1
openSUSE:Tumbleweedaclbefore 2.4.0-1.12.4.0-1.1
Red Hat:enterprise_linux:10.2aclbefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:10.2acl-debuginfobefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:10.2acl-debugsourcebefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:10.2libaclbefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:10.2libacl-debuginfobefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:10.2libacl-develbefore 0:2.4.0-1.el10_20:2.4.0-1.el10_2
Red Hat:enterprise_linux:8::baseosaclbefore 0:2.4.0-1.el8_100:2.4.0-1.el8_10
Red Hat:enterprise_linux:8::baseosacl-debuginfobefore 0:2.4.0-1.el8_100:2.4.0-1.el8_10
Red Hat:enterprise_linux:8::baseosacl-debugsourcebefore 0:2.4.0-1.el8_100:2.4.0-1.el8_10
Red Hat:enterprise_linux:8::baseoslibaclbefore 0:2.4.0-1.el8_100:2.4.0-1.el8_10

+18

Same product

acl project: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-54369acl < 2.4.0 Symlink Traversal Privilege Escalation via libacl Functions
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
acl project acl2.4.0Vendor (CNA)
almalinux:acl2.4.0-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:libacl2.4.0-1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:libacl-devel2.4.0-1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:acl2.4.0-1 · Debian:14Package registry (OSV)
opensuse:acl2.4.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:attr2.6.0-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:acl0:2.4.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:acl-debuginfo0:2.4.0-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:acl-debugsource0:2.4.0-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libacl0:2.4.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libacl0:2.4.0-1.el9_8 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:libacl-debuginfo0:2.4.0-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libacl-devel0:2.4.0-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libacl-devel0:2.4.0-1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:acl0:2.4.0-1.el9_8 · Rocky Linux:9Package registry (OSV)
suse:acl2.4.0-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:attr2.6.0-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Not on record for this CVE: EPSS history · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS 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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records