Vulnerability-Lookup

RHSA-2026:52805

Vulnerability from csaf_redhat - Published: 2026-08-10 11:15 - Updated: 2026-09-08 22:45

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: fuse-overlayfs: * fuse-overlayfs-1.17-1.hum1 (aarch64, x86_64) * fuse-overlayfs-1.17-1.hum1.src (src)

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-2026-52791

A flaw was found in fuse-overlayfs, a component used for rootless containers. This vulnerability allows a low-privileged process to retain SUID (Set User ID) and SGID (Set Group ID) permissions on files after they are truncated or opened with the O_TRUNC flag. This can enable a local attacker to manipulate file permissions, potentially leading to privilege escalation within the system.

4.7 (Medium)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE-281 - Improper Preservation of Permissions

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:fuse-overlayfs-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:fuse-overlayfs-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:fuse-overlayfs-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:52805	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-52791	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-52791	self
https://bugzilla.redhat.com/show_bug.cgi?id=2508489	external
https://www.cve.org/CVERecord?id=CVE-2026-52791	external
https://nvd.nist.gov/vuln/detail/CVE-2026-52791	external
https://github.com/containers/fuse-overlayfs/comm…	external
https://github.com/containers/fuse-overlayfs/rele…	external
https://github.com/containers/fuse-overlayfs/secu…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://access.redhat.com/security/updates/classification/",
      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright \u00a9 Red Hat, Inc. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "An update for Red Hat Hardened Images RPMs is now available.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "This update includes the following RPMs:\n\nfuse-overlayfs:\n  * fuse-overlayfs-1.17-1.hum1 (aarch64, x86_64)\n  * fuse-overlayfs-1.17-1.hum1.src (src)",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://access.redhat.com/security/team/contact/",
      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
      "name": "Red Hat Product Security",
      "namespace": "https://www.redhat.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "https://access.redhat.com/errata/RHSA-2026:52805",
        "url": "https://access.redhat.com/errata/RHSA-2026:52805"
      },
      {
        "category": "external",
        "summary": "https://images.redhat.com/",
        "url": "https://images.redhat.com/"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/cve/CVE-2026-52791",
        "url": "https://access.redhat.com/security/cve/CVE-2026-52791"
      },
      {
        "category": "external",
        "summary": "https://access.redhat.com/security/updates/classification/",
        "url": "https://access.redhat.com/security/updates/classification/"
      },
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_52805.json"
      }
    ],
    "title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
    "tracking": {
      "current_release_date": "2026-09-08T22:45:21+00:00",
      "generator": {
        "date": "2026-09-08T22:45:21+00:00",
        "engine": {
          "name": "Red Hat SDEngine",
          "version": "5.3.17"
        }
      },
      "id": "RHSA-2026:52805",
      "initial_release_date": "2026-08-10T11:15:35+00:00",
      "revision_history": [
        {
          "date": "2026-08-10T11:15:35+00:00",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-08T14:31:09+00:00",
          "number": "2",
          "summary": "Last updated version"
        },
        {
          "date": "2026-09-08T22:45:21+00:00",
          "number": "3",
          "summary": "Last generated version"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Red Hat Hardened Images",
                "product": {
                  "name": "Red Hat Hardened Images",
                  "product_id": "Red Hat Hardened Images",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:redhat:hummingbird:1"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Red Hat Hardened Images"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-main@aarch64",
                "product": {
                  "name": "fuse-overlayfs-main@aarch64",
                  "product_id": "fuse-overlayfs-main@aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/fuse-overlayfs@1.17-1.hum1?arch=aarch64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-aarch64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-main@src",
                "product": {
                  "name": "fuse-overlayfs-main@src",
                  "product_id": "fuse-overlayfs-main@src",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/fuse-overlayfs@1.17-1.hum1?arch=src\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-source-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "src"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-main@x86_64",
                "product": {
                  "name": "fuse-overlayfs-main@x86_64",
                  "product_id": "fuse-overlayfs-main@x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/redhat/fuse-overlayfs@1.17-1.hum1?arch=x86_64\u0026distro=hummingbird-20251124\u0026repository_id=public-hummingbird-x86_64-rpms"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          }
        ],
        "category": "vendor",
        "name": "Red Hat"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-main@aarch64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:fuse-overlayfs-main@aarch64"
        },
        "product_reference": "fuse-overlayfs-main@aarch64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-main@src as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:fuse-overlayfs-main@src"
        },
        "product_reference": "fuse-overlayfs-main@src",
        "relates_to_product_reference": "Red Hat Hardened Images"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-main@x86_64 as a component of Red Hat Hardened Images",
          "product_id": "Red Hat Hardened Images:fuse-overlayfs-main@x86_64"
        },
        "product_reference": "fuse-overlayfs-main@x86_64",
        "relates_to_product_reference": "Red Hat Hardened Images"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-52791",
      "cwe": {
        "id": "CWE-281",
        "name": "Improper Preservation of Permissions"
      },
      "discovery_date": "2026-07-29T17:01:47.314580+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2508489"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in fuse-overlayfs, a component used for rootless containers. This vulnerability allows a low-privileged process to retain SUID (Set User ID) and SGID (Set Group ID) permissions on files after they are truncated or opened with the O_TRUNC flag. This can enable a local attacker to manipulate file permissions, potentially leading to privilege escalation within the system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat is aware of this issue affecting fuse-overlayfs, which is used as an optional, non-default storage backend for rootless Podman/Buildah on kernels or configurations where native (kernel) overlayfs support for user namespaces is unavailable. On currently supported Red Hat Enterprise Linux releases (RHEL \u003e= 8.5 / RHEL 9 / RHEL 10), rootless Podman uses native kernel overlayfs by default; fuse-overlayfs is only invoked as a fallback or when explicitly configured via storage.conf\u0027s mount_program option, or in nested/unprivileged container scenarios (e.g. rootless Buildah image builds) that lack CAP_SYS_ADMIN. Exploitation additionally requires a pre-existing file in the container\u0027s lower image layer that already carries the SUID or SGID bit and is writable by a low-privileged process, an atypical container image configuration. Red Hat rates the overall risk of this issue as reduced relative to a generic worst-case rating given these preconditions; see the private triage comment on this flaw for the full reachability and CVSS analysis.",
          "title": "Statement"
        },
        {
          "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": [
          "Red Hat Hardened Images:fuse-overlayfs-main@aarch64",
          "Red Hat Hardened Images:fuse-overlayfs-main@src",
          "Red Hat Hardened Images:fuse-overlayfs-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-52791"
        },
        {
          "category": "external",
          "summary": "RHBZ#2508489",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508489"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-52791",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-52791"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-52791",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52791"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f",
          "url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17",
          "url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h",
          "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
        }
      ],
      "release_date": "2026-07-29T16:14:46.724000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-10T11:15:35+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:fuse-overlayfs-main@aarch64",
            "Red Hat Hardened Images:fuse-overlayfs-main@src",
            "Red Hat Hardened Images:fuse-overlayfs-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:52805"
        },
        {
          "category": "workaround",
          "details": "Avoid configuring fuse-overlayfs as the storage mount_program for rootless Podman/Buildah where native overlayfs support is available (this is not the default on supported RHEL releases). Ensure container images do not ship world- or group-writable files with the SUID or SGID bit set. No other mitigation is available prior to upgrading to fuse-overlayfs \u003e= 1.17.",
          "product_ids": [
            "Red Hat Hardened Images:fuse-overlayfs-main@aarch64",
            "Red Hat Hardened Images:fuse-overlayfs-main@src",
            "Red Hat Hardened Images:fuse-overlayfs-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:fuse-overlayfs-main@aarch64",
            "Red Hat Hardened Images:fuse-overlayfs-main@src",
            "Red Hat Hardened Images:fuse-overlayfs-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "fuse-overlayfs: fuse-overlayfs: Privilege Escalation Vulnerability via SUID/SGID Bit Preservation"
    }
  ]
}

CVE-2026-52791 (GCVE-0-2026-52791)

Vulnerability from cvelistv5 – Published: 2026-07-29 16:14 – Updated: 2026-07-29 17:56

Title

fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)

Summary

fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17.

Severity

2 (Low)


                        
                          CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 17:56 UTC

CWE

CWE-266 - Incorrect Privilege Assignment

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/containers/fuse-overlayfs/secu…	x_refsource_CONFIRM
https://github.com/containers/fuse-overlayfs/comm…	x_refsource_MISC
https://github.com/containers/fuse-overlayfs/rele…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
containers	fuse-overlayfs	Affected: < 1.17

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-52791",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-29T17:56:35.819478Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-29T17:56:43.388Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "fuse-overlayfs",
          "vendor": "containers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.17"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "fuse-overlayfs is an implementation of overlayfs in FUSE for rootless containers. Prior to 1.17, the release-1.x C branch preserves SUID and SGID mode bits in main.c during open(O_TRUNC) and truncate handling on a copied-up file, allowing a low-privileged process to leave the upper-layer file with mode 4777. This issue is fixed in version 1.17."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 2,
            "baseSeverity": "LOW",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-266",
              "description": "CWE-266: Incorrect Privilege Assignment",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T16:14:46.724Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/security/advisories/GHSA-2cc4-p72c-v85h"
        },
        {
          "name": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/commit/97e0d968a782fc259ebde112db1e9b9ff1ad724f"
        },
        {
          "name": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/containers/fuse-overlayfs/releases/tag/v1.17"
        }
      ],
      "source": {
        "advisory": "GHSA-2cc4-p72c-v85h",
        "discovery": "UNKNOWN"
      },
      "title": "fuse-overlayfs release-1.x preserves SUID/SGID bits after truncate/open(O_TRUNC)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-52791",
    "datePublished": "2026-07-29T16:14:46.724Z",
    "dateReserved": "2026-06-08T18:02:19.731Z",
    "dateUpdated": "2026-07-29T17:56:43.388Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.