Vulnerability-Lookup

RHSA-2026:54855

Vulnerability from csaf_redhat - Published: 2026-08-14 13:03 - Updated: 2026-10-23 19:36

Summary

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

Severity

Important

Notes

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

Details: This update includes the following RPMs: crun: * crun-1.28-2.hum1 (aarch64, x86_64) * crun-krun-1.28-2.hum1 (aarch64, x86_64) * crun-wasm-1.28-2.hum1 (aarch64, x86_64) * crun-1.28-2.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-2026-47766

A flaw was found in crun, an OCI Container Runtime. When processing an OCI bundle where the container root filesystem's /dev directory is a symbolic link and /dev is not explicitly mounted, crun incorrectly follows this symlink outside the container's intended boundaries. This allows a local attacker to create or overwrite device nodes and symlinks in arbitrary locations on the host system, potentially leading to privilege escalation or denial of service.

8.4 (High)


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

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Affected products

Fixed 7 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:crun-0:1.28-2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-0:1.28-2.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-0:1.28-2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:54855	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-47766	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-2026-47766	self
https://bugzilla.redhat.com/show_bug.cgi?id=2516081	external
https://www.cve.org/CVERecord?id=CVE-2026-47766	external
https://nvd.nist.gov/vuln/detail/CVE-2026-47766	external
https://github.com/containers/crun/releases/tag/1.28	external
https://github.com/containers/crun/security/advis…	external

JSON

To clipboard

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        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2026-08-14T16:32:20.802273+00:00",
      "ids": [
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          "text": "A flaw was found in crun, an OCI Container Runtime. When processing an OCI bundle where the container root filesystem\u0027s /dev directory is a symbolic link and /dev is not explicitly mounted, crun incorrectly follows this symlink outside the container\u0027s intended boundaries. This allows a local attacker to create or overwrite device nodes and symlinks in arbitrary locations on the host system, potentially leading to privilege escalation or denial of service.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crun: crun: Arbitrary file creation/overwrite via symlink following",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw was found in crun\u0027s device setup routine. When processing an OCI container bundle where the rootfs \"/dev\" directory is configured as a symlink and \"/dev\" is not explicitly mounted, crun traverses the symlink without using O_NOFOLLOW. This allows crun to create default device nodes and stdio symlinks at the target path on the host filesystem outside the container boundary. A local attacker supplying a crafted bundle can overwrite existing host files or create unauthorized device nodes, potentially resulting in host denial of service, file corruption, or privilege escalation.",
          "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"
        }
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          "Red Hat Hardened Images:crun-0:1.28-2.hum1@src",
          "Red Hat Hardened Images:crun-0:1.28-2.hum1@x86_64",
          "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@aarch64",
          "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@x86_64",
          "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@aarch64",
          "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@x86_64"
        ]
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        },
        {
          "category": "external",
          "summary": "RHBZ#2516081",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516081"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-47766",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-47766"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47766",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47766"
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        {
          "category": "external",
          "summary": "https://github.com/containers/crun/releases/tag/1.28",
          "url": "https://github.com/containers/crun/releases/tag/1.28"
        },
        {
          "category": "external",
          "summary": "https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5",
          "url": "https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5"
        }
      ],
      "release_date": "2026-08-14T16:16:37.525000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-14T13:03:09+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/",
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            "Red Hat Hardened Images:crun-0:1.28-2.hum1@src",
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:54855"
        },
        {
          "category": "workaround",
          "details": "Explicitly configure a dedicated \"/dev\" mount point inside the container bundle specification, or restrict untrusted users from deploying custom, unvetted OCI container bundles on the host.",
          "product_ids": [
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@src",
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@src",
            "Red Hat Hardened Images:crun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-krun-0:1.28-2.hum1@x86_64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@aarch64",
            "Red Hat Hardened Images:crun-wasm-0:1.28-2.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crun: crun: Arbitrary file creation/overwrite via symlink following"
    }
  ]
}

CVE-2026-47766 (GCVE-0-2026-47766)

Vulnerability from cvelistv5 – Published: 2026-08-14 16:16 – Updated: 2026-08-14 16:32

Title

crun follows rootfs /dev symlink while creating default devices

Summary

crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun's default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun's forced `ptmx -> pts/ptmx` symlink. Version 1.28 fixes the issue.

Severity

5.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 16:32 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7978 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/containers/crun/security/advis…	x_refsource_CONFIRM
https://github.com/containers/crun/releases/tag/1.28	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
containers	crun	Affected: < 1.28

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47766",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T16:32:07.749164Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T16:32:20.537Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "crun",
          "vendor": "containers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.28"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "crun is an open source OCI Container Runtime fully written in C. Prior to version 1.28, crun\u0027s default device setup opens the container rootfs `/dev` directory without `O_NOFOLLOW`. If an OCI bundle contains `rootfs/dev` as a symlink and the bundle configuration does not mount `/dev`, crun follows that symlink and creates the default device nodes and stdio symlinks at the symlink target outside the container rootfs. In a local rootful crun replay, this created fixed device nodes and symlinks outside the rootfs before crun returned failure. A pre-existing file named `ptmx` in the target directory was also replaced by crun\u0027s forced `ptmx -\u003e pts/ptmx` symlink. Version 1.28 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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-61",
              "description": "CWE-61: UNIX Symbolic Link (Symlink) Following",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-14T16:16:37.525Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/containers/crun/security/advisories/GHSA-7vwr-4279-7gq5"
        },
        {
          "name": "https://github.com/containers/crun/releases/tag/1.28",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/containers/crun/releases/tag/1.28"
        }
      ],
      "source": {
        "advisory": "GHSA-7vwr-4279-7gq5",
        "discovery": "UNKNOWN"
      },
      "title": "crun follows rootfs /dev symlink while creating default devices"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-47766",
    "datePublished": "2026-08-14T16:16:37.525Z",
    "dateReserved": "2026-05-19T22:36:16.882Z",
    "dateUpdated": "2026-08-14T16:32:20.537Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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