acl < 2.4.0 Symlink Traversal Privilege Escalation via libacl Functions
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 47 fixed, 3 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| acl project | acl | before 2.4.0 | 2.4.0 | Patch available | CNA |
- acl Vendoracl project Affected before 2.4.0 Fixed in 2.4.0 Patch available CNA
Remediation
- Fix · CNA acl (acl project) Fixed in 2.4.0
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- Red Hat Enterprise Linux AppStream (v. 10) libacl-devel-2.4.0-1.el10_2
- Red Hat Enterprise Linux BaseOS (v. 10) acl-2.4.0-1.el10_2, libacl-2.4.0-1.el10_2
- RHSA-2026:34351 Released 2026-07-01 · Red Hat rating ImportantRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images acl-2.4.0-0.1.hum1@aarch64, acl-2.4.0-0.1.hum1@src, acl-2.4.0-0.1.hum1@x86_64 +4
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
acl 2.4.0
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-39262 acl < 2.4.0 TOCTOU Symlink Traversal via getfacl/setfacl/chaclPriority LOW 32
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix yet |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Cert Manager support for Red Hat OpenShift release 1.17 | Fixed | RHSA-2026:82304, RHSA-2026:82322, RHSA-2026:82336, RHSA-2026:82888 |
| Cert Manager support for Red Hat OpenShift release 1.18 | Fixed | RHSA-2026:82347, RHSA-2026:82354, RHSA-2026:82372, RHSA-2026:82857 |
| Cert Manager support for Red Hat OpenShift release 1.20 | Fixed | RHSA-2026:72394, RHSA-2026:72395, RHSA-2026:72399, RHSA-2026:72470, RHSA-2026:72475, RHSA-2026:72476, RHSA-2026:72502 |
| Cost Management 4 | Fixed | RHSA-2026:81201 |
| Red Hat AI Inference Server 3.2 | Fixed | RHSA-2026:73859, RHSA-2026:73929, RHSA-2026:73930 |
| Red Hat AI Inference Server 3.5 | Fixed | RHSA-2026:82059, RHSA-2026:82061, RHSA-2026:82066, RHSA-2026:82368, RHSA-2026:82371, RHSA-2026:82415 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:46836 |
| Red Hat Enterprise Linux AI 3.5 | Fixed | RHSA-2026:92449, RHSA-2026:92452 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:42739 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:42736 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:67142 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:67144 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:64805 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:67140 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:42739 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:43420 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:42736 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:72820 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:72819 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2026:71656 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:67142 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:67144 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:64805 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:67140 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:72820 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) | Fixed | RHSA-2026:72819 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2026:71656 |
| Red Hat Hardened Images | Fixed | RHSA-2026:34351 |
| Red Hat Insights proxy 1.5 | Fixed | RHSA-2026:53371 |
| Red Hat OpenShift AI 3.0 | Fixed | RHSA-2026:73909, RHSA-2026:73959, RHSA-2026:73960, RHSA-2026:73961, RHSA-2026:73962 |
| Red Hat OpenShift AI 3.2 | Fixed | RHSA-2026:74458, RHSA-2026:74459, RHSA-2026:74460, RHSA-2026:74461, RHSA-2026:74462, RHSA-2026:74463 |
| Red Hat OpenShift AI 3.3 | Fixed | RHSA-2026:74359, RHSA-2026:74360, RHSA-2026:74361, RHSA-2026:74362, RHSA-2026:74363, RHSA-2026:74364, RHSA-2026:74365, RHSA-2026:74450, RHSA-2026:80756, RHSA-2026:81127 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:74674, RHSA-2026:74677, RHSA-2026:74678, RHSA-2026:74679, RHSA-2026:74681, RHSA-2026:74683, RHSA-2026:74685, RHSA-2026:74687, RHSA-2026:74688 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:74771, RHSA-2026:75652, RHSA-2026:75654, RHSA-2026:75655, RHSA-2026:75657, RHSA-2026:75658, RHSA-2026:75659, RHSA-2026:75660, RHSA-2026:76042 |
| Red Hat OpenShift Container Platform 4.12 | Fixed | RHSA-2026:90272 |
| Red Hat OpenShift Container Platform 4.13 | Fixed | RHSA-2026:77320 |
| Red Hat OpenShift Container Platform 4.14 | Fixed | RHSA-2026:73866 |
| Red Hat OpenShift Container Platform 4.15 | Fixed | RHSA-2026:82811 |
| Red Hat OpenShift Container Platform 4.16 | Fixed | RHSA-2026:73851 |
| Red Hat OpenShift Container Platform 4.17 | Fixed | RHSA-2026:70586 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:89725 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:71440 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:71442 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:71444 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:54769 |
| Red Hat OpenShift distributed tracing 3.10.1 | Fixed | RHSA-2026:50205 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:44481, RHSA-2026:58981 |
Not affected: 18 products
- Cert Manager support for Red Hat OpenShift release 1.20
- Cost Management 4
- Red Hat Enterprise Linux AppStream (v. 10)
- Red Hat Enterprise Linux AppStream (v. 9)
- Red Hat Enterprise Linux AppStream E4S (v.9.2)
- Red Hat Enterprise Linux AppStream E4S (v.9.4)
- Red Hat Enterprise Linux AppStream EUS (v. 10.0)
- Red Hat Enterprise Linux AppStream EUS (v.9.6)
- Red Hat Enterprise Linux BaseOS (v. 10)
- Red Hat Enterprise Linux BaseOS (v. 8)
- Red Hat Enterprise Linux BaseOS (v. 9)
- Red Hat Enterprise Linux BaseOS E4S (v.9.2)
- Red Hat Enterprise Linux BaseOS E4S (v.9.4)
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
- Red Hat Enterprise Linux BaseOS EUS (v.9.6)
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift distributed tracing 3.10.1
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54369
- 2026-10-03 Alias added: GHSA-53ch-pxc8-6g72
- 2026-10-05 Fix available: RHSA-2026:75659 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75660 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75655 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75657 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75654 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75652 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75658 · Red Hat
- 2026-10-05 Affected versions changed · Red Hat
- 2026-10-06 Fix available: RHSA-2026:76042 · Red Hat
- 2026-10-06 Affected versions changed · Red Hat
- 2026-10-09 Fix available: RHSA-2026:73866 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:73851 · Red Hat
- 2026-10-09 Fix available: Red Hat OpenShift Container Platform 4.14, Red Hat OpenShift Container Platform 4.16 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:81201 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82066 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:80756 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:81127 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82061 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82059 · Red Hat
- 2026-10-13 Fix available: Cost Management 4, Red Hat AI Inference Server 3.5 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82368 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82415 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82371 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82304 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82322 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82336 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82372 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82354 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82347 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82857 · Red Hat
- 2026-10-15 Fix available: RHSA-2026:82888 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:77320 · Red Hat
- 2026-10-16 Fix available: Cert Manager support for Red Hat OpenShift release 1.17, Cert Manager support for Red Hat OpenShift release 1.18, Red Hat OpenShift Container Platform 4.13 · Red Hat
- 2026-10-23 Fix available: RHSA-2026:82811 · Red Hat
- 2026-10-23 Fix available: Red Hat OpenShift Container Platform 4.15 · Red Hat
- 2026-10-27 Fix available: Red Hat OpenShift Container Platform 4.12, Red Hat OpenShift Container Platform 4.18 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:90272 · Red Hat
- 2026-10-29 Fix available: RHSA-2026:89725 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:92452 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:92449 · Red Hat
- 2026-10-30 Fix available: Red Hat Enterprise Linux AI 3.5 · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-31 Fix available: Red Hat OpenShift distributed tracing 3.10.1 · Red Hat
- 2026-11-06 Affected versions changed · Red Hat
References
More acl project vulnerabilities
- TI-2026-39262 acl < 2.4.0 TOCTOU Symlink Traversal via getfacl/setfacl/chacl CVSS 4.0HIGH 7.2
Sources
- CVE-2026-54369 · CVE Program
- CVE-2026-54369 · NVD
- FIRST EPSS
- GHSA-53ch-pxc8-6g72 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-54369 · Red Hat security data · CC BY 4.0
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