RHSA-2026:34351

Vulnerability from csaf_redhat - Published: 2026-07-01 15:01 - Updated: 2026-08-04 19:43
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: acl: * acl-2.4.0-0.1.hum1 (aarch64, x86_64) * libacl-2.4.0-0.1.hum1 (aarch64, x86_64) * libacl-devel-2.4.0-0.1.hum1 (aarch64, x86_64) * acl-2.4.0-0.1.hum1.src (src) Security Fix(es): acl: * CVE-2026-54369 * CVE-2026-54370
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-54369

A flaw was found in the `acl` package, specifically within its `libacl` pathname-based functions. A local attacker could exploit this vulnerability by using a symbolic link to replace a pathname component. This could allow the attacker to redirect access control list (ACL) read or write operations to arbitrary files or directories, leading to unauthorized manipulation of ACLs and ultimately local privilege escalation.

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:acl-main@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:acl-main@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:acl-main@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-54370

A time-of-check to time-of-use (TOCTOU) race condition vulnerability was found in `acl`. By replacing a pathname component with a symbolic link between a security check and subsequent file operations, an attacker can redirect file access control list operations. This occurs when privileged processes invoke `getfacl` or `setfacl` over an attacker-controlled path, potentially leading to local privilege escalation.

6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:acl-main@aarch64 —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:acl-main@src —
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:acl-main@x86_64 —
Vendor Fix fix
Threats
Impact Moderate
References
Acknowledgments
Andrew Tridgell <tridge60@gmail.com> Alexander Peslyak <solar@openwall.com>
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        "text": "This update includes the following RPMs:\n\nacl:\n  * acl-2.4.0-0.1.hum1 (aarch64, x86_64)\n  * libacl-2.4.0-0.1.hum1 (aarch64, x86_64)\n  * libacl-devel-2.4.0-0.1.hum1 (aarch64, x86_64)\n  * acl-2.4.0-0.1.hum1.src (src)\n\nSecurity Fix(es):\n\nacl:\n  * CVE-2026-54369\n  * CVE-2026-54370",
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  "vulnerabilities": [
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          "names": [
            "Andrew Tridgell \u003ctridge60@gmail.com\u003e",
            "Alexander Peslyak \u003csolar@openwall.com\u003e"
          ]
        }
      ],
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        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
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      "ids": [
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          "text": "2490277"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `acl` package, specifically within its `libacl` pathname-based functions. A local attacker could exploit this vulnerability by using a symbolic link to replace a pathname component. This could allow the attacker to redirect access control list (ACL) read or write operations to arbitrary files or directories, leading to unauthorized manipulation of ACLs and ultimately local privilege escalation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "acl: Symlink traversal privilege escalation via libacl functions",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this flaw as Important because a local attacker who controls any component of a pathname processed by a privileged process using libacl can redirect ACL operations to arbitrary files. Exploitation requires local access with the ability to create symlinks in a directory that a privileged program later processes with acl_get_file() or acl_set_file(). In default RHEL and OpenShift CoreOS configurations, standard file permission settings limit where unprivileged users can create symlinks, reducing the practical attack surface. Programs that operate on user-supplied paths with elevated privileges are most at risk.",
          "title": "Statement"
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          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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            "Red Hat Hardened Images:acl-main@src",
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        {
          "category": "workaround",
          "details": "Restrict unprivileged users from creating symlinks in directories that privileged processes operate on with ACL commands. Where possible, use the fs.protected_symlinks sysctl (enabled by default on RHEL 7+), which prevents symlink following in world-writable sticky directories unless the owner of the symlink matches the owner of the target file or directory.",
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      "threats": [
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          "details": "Important"
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      "title": "acl: Symlink traversal privilege escalation via libacl functions"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Andrew Tridgell \u003ctridge60@gmail.com\u003e",
            "Alexander Peslyak \u003csolar@openwall.com\u003e"
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      ],
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        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "discovery_date": "2026-06-16T19:47:00+00:00",
      "ids": [
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          "text": "2490279"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A time-of-check to time-of-use (TOCTOU) race condition vulnerability was found in `acl`. By replacing a pathname component with a symbolic link between a security check and subsequent file operations, an attacker can redirect file access control list operations. This occurs when privileged processes invoke `getfacl` or `setfacl` over an attacker-controlled path, potentially leading to local privilege escalation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "acl: TOCTOU Symlink Traversal via getfacl/setfacl",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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          "Red Hat Hardened Images:acl-main@src",
          "Red Hat Hardened Images:acl-main@x86_64"
        ]
      },
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-54370"
        },
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            "Red Hat Hardened Images:acl-main@src",
            "Red Hat Hardened Images:acl-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:34351"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:acl-main@aarch64",
            "Red Hat Hardened Images:acl-main@src",
            "Red Hat Hardened Images:acl-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "acl: TOCTOU Symlink Traversal via getfacl/setfacl"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.