Vulnerability-Lookup

OPENSUSE-SU-2026:21753-1

Vulnerability from csaf_opensuse - Published: 2026-09-03 20:12 - Updated: 2026-09-16 21:48

Summary

Security update for fuse-overlayfs

Severity

Moderate

Notes

Title of the patch: Security update for fuse-overlayfs

Description of the patch: This update for fuse-overlayfs fixes the following issue: - CVE-2026-52791: privilege escalation due to SUID/SGID bit preservation after truncate operation (bsc#1273100).

Patchnames: openSUSE-Leap-16.0-1601

CVE-2026-52791

4.7 (Medium)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

6 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1273100	self
https://www.suse.com/security/cve/CVE-2026-52791/	self
https://www.suse.com/security/cve/CVE-2026-52791	external
https://bugzilla.suse.com/1273100	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "namespace": "https://www.suse.com/support/security/rating/",
      "text": "moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Copyright 2024 SUSE LLC. All rights reserved.",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "summary",
        "text": "Security update for fuse-overlayfs",
        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This update for fuse-overlayfs fixes the following issue:\n\n- CVE-2026-52791: privilege escalation due to SUID/SGID bit preservation after truncate operation (bsc#1273100).\n",
        "title": "Description of the patch"
      },
      {
        "category": "details",
        "text": "openSUSE-Leap-16.0-1601",
        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://www.suse.com/support/security/contact/",
      "name": "SUSE Product Security Team",
      "namespace": "https://www.suse.com/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SUSE ratings",
        "url": "https://www.suse.com/support/security/rating/"
      },
      {
        "category": "self",
        "summary": "URL of this CSAF notice",
        "url": "https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21753-1.json"
      },
      {
        "category": "self",
        "summary": "SUSE Bug 1273100",
        "url": "https://bugzilla.suse.com/1273100"
      },
      {
        "category": "self",
        "summary": "SUSE CVE CVE-2026-52791 page",
        "url": "https://www.suse.com/security/cve/CVE-2026-52791/"
      }
    ],
    "title": "Security update for fuse-overlayfs",
    "tracking": {
      "current_release_date": "2026-09-16T21:48:01Z",
      "generator": {
        "date": "2026-09-03T20:12:47Z",
        "engine": {
          "name": "cve-database.git:bin/generate-csaf.pl",
          "version": "1"
        }
      },
      "id": "openSUSE-SU-2026:21753-1",
      "initial_release_date": "2026-09-03T20:12:47Z",
      "revision_history": [
        {
          "date": "2026-09-03T20:12:47Z",
          "number": "1",
          "summary": "Current version"
        },
        {
          "date": "2026-09-16T20:47:10Z",
          "number": "2",
          "summary": "unknown changes"
        },
        {
          "date": "2026-09-16T21:48:01Z",
          "number": "3",
          "summary": "unknown changes"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-1.15-160000.3.1.aarch64",
                "product": {
                  "name": "fuse-overlayfs-1.15-160000.3.1.aarch64",
                  "product_id": "fuse-overlayfs-1.15-160000.3.1.aarch64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/fuse-overlayfs@1.15-160000.3.1?arch=aarch64\u0026upstream=fuse-overlayfs-1.15-160000.3.1.src.rpm"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "aarch64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-1.15-160000.3.1.ppc64le",
                "product": {
                  "name": "fuse-overlayfs-1.15-160000.3.1.ppc64le",
                  "product_id": "fuse-overlayfs-1.15-160000.3.1.ppc64le",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/fuse-overlayfs@1.15-160000.3.1?arch=ppc64le\u0026upstream=fuse-overlayfs-1.15-160000.3.1.src.rpm"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "ppc64le"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-1.15-160000.3.1.s390x",
                "product": {
                  "name": "fuse-overlayfs-1.15-160000.3.1.s390x",
                  "product_id": "fuse-overlayfs-1.15-160000.3.1.s390x",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/fuse-overlayfs@1.15-160000.3.1?arch=s390x\u0026upstream=fuse-overlayfs-1.15-160000.3.1.src.rpm"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "s390x"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "fuse-overlayfs-1.15-160000.3.1.x86_64",
                "product": {
                  "name": "fuse-overlayfs-1.15-160000.3.1.x86_64",
                  "product_id": "fuse-overlayfs-1.15-160000.3.1.x86_64",
                  "product_identification_helper": {
                    "purl": "pkg:rpm/suse/fuse-overlayfs@1.15-160000.3.1?arch=x86_64\u0026upstream=fuse-overlayfs-1.15-160000.3.1.src.rpm"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "x86_64"
          },
          {
            "branches": [
              {
                "category": "product_name",
                "name": "openSUSE Leap 16.0",
                "product": {
                  "name": "openSUSE Leap 16.0",
                  "product_id": "openSUSE Leap 16.0"
                }
              }
            ],
            "category": "product_family",
            "name": "SUSE Linux Enterprise"
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-1.15-160000.3.1.aarch64 as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.aarch64"
        },
        "product_reference": "fuse-overlayfs-1.15-160000.3.1.aarch64",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-1.15-160000.3.1.ppc64le as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.ppc64le"
        },
        "product_reference": "fuse-overlayfs-1.15-160000.3.1.ppc64le",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-1.15-160000.3.1.s390x as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.s390x"
        },
        "product_reference": "fuse-overlayfs-1.15-160000.3.1.s390x",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fuse-overlayfs-1.15-160000.3.1.x86_64 as component of openSUSE Leap 16.0",
          "product_id": "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.x86_64"
        },
        "product_reference": "fuse-overlayfs-1.15-160000.3.1.x86_64",
        "relates_to_product_reference": "openSUSE Leap 16.0"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-52791",
      "ids": [
        {
          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-52791"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "recommended": [
          "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.aarch64",
          "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.ppc64le",
          "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.s390x",
          "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.x86_64"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVE-2026-52791",
          "url": "https://www.suse.com/security/cve/CVE-2026-52791"
        },
        {
          "category": "external",
          "summary": "SUSE Bug 1273100 for CVE-2026-52791",
          "url": "https://bugzilla.suse.com/1273100"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.aarch64",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.ppc64le",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.s390x",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.aarch64",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.ppc64le",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.s390x",
            "openSUSE Leap 16.0:fuse-overlayfs-1.15-160000.3.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-09-03T20:12:47Z",
          "details": "moderate"
        }
      ],
      "title": "CVE-2026-52791"
    }
  ]
}

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.